diff --git a/weed/command/mount_std.go b/weed/command/mount_std.go
index 56338e327..a6d562d40 100644
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -5,7 +5,7 @@ package command
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/storage"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"os"
 	"os/user"
 	"path"
@@ -169,7 +169,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		mountRoot = mountRoot[0 : len(mountRoot)-1]
 	}
 
-	diskType := storage.ToDiskType(*option.diskType)
+	diskType := types.ToDiskType(*option.diskType)
 
 	seaweedFileSystem := filesys.NewSeaweedFileSystem(&filesys.Option{
 		MountDirectory:     dir,
diff --git a/weed/command/volume.go b/weed/command/volume.go
index a85f9b6be..ff951afdc 100644
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@@ -2,6 +2,7 @@ package command
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"net/http"
 	httppprof "net/http/pprof"
 	"os"
@@ -170,10 +171,10 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 	}
 
 	// set disk types
-	var diskTypes []storage.DiskType
+	var diskTypes []types.DiskType
 	diskTypeStrings := strings.Split(*v.diskType, ",")
 	for _, diskTypeString := range diskTypeStrings {
-		diskTypes = append(diskTypes, storage.ToDiskType(diskTypeString))
+		diskTypes = append(diskTypes, types.ToDiskType(diskTypeString))
 	}
 	if len(diskTypes) == 1 && len(v.folders) > 1 {
 		for i := 0; i < len(v.folders)-1; i++ {
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index b41d76cd6..c6d9080a1 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filer"
-	"github.com/chrislusf/seaweedfs/weed/storage"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 	"math"
 	"os"
@@ -35,7 +35,7 @@ type Option struct {
 	Collection         string
 	Replication        string
 	TtlSec             int32
-	DiskType           storage.DiskType
+	DiskType           types.DiskType
 	ChunkSizeLimit     int64
 	ConcurrentWriters  int
 	CacheDir           string
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 613b794df..6a1758ccc 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -61,8 +61,7 @@ message Heartbeat {
     repeated VolumeEcShardInformationMessage deleted_ec_shards = 18;
     bool has_no_ec_shards = 19;
 
-    uint32 max_volume_count = 4;
-    uint32 max_ssd_volume_count = 20;
+    map<string, uint32> max_volume_counts = 4;
 
 }
 
@@ -105,6 +104,7 @@ message VolumeEcShardInformationMessage {
     uint32 id = 1;
     string collection = 2;
     uint32 ec_index_bits = 3;
+    string disk_type = 4;
 }
 
 message StorageBackend {
@@ -213,8 +213,8 @@ message CollectionDeleteResponse {
 //
 // volume related
 //
-message DataNodeInfo {
-    string id = 1;
+message DiskInfo {
+    string type = 1;
     uint64 volume_count = 2;
     uint64 max_volume_count = 3;
     uint64 free_volume_count = 4;
@@ -222,41 +222,25 @@ message DataNodeInfo {
     repeated VolumeInformationMessage volume_infos = 6;
     repeated VolumeEcShardInformationMessage ec_shard_infos = 7;
     uint64 remote_volume_count = 8;
-    uint64 max_ssd_volume_count = 9;
-    uint64 ssd_volume_count = 10;
+}
+message DataNodeInfo {
+    string id = 1;
+    map<string, DiskInfo> diskInfos = 2;
 }
 message RackInfo {
     string id = 1;
-    uint64 volume_count = 2;
-    uint64 max_volume_count = 3;
-    uint64 free_volume_count = 4;
-    uint64 active_volume_count = 5;
-    repeated DataNodeInfo data_node_infos = 6;
-    uint64 remote_volume_count = 7;
-    uint64 max_ssd_volume_count = 8;
-    uint64 ssd_volume_count = 9;
+    repeated DataNodeInfo data_node_infos = 2;
+    map<string, DiskInfo> diskInfos = 3;
 }
 message DataCenterInfo {
     string id = 1;
-    uint64 volume_count = 2;
-    uint64 max_volume_count = 3;
-    uint64 free_volume_count = 4;
-    uint64 active_volume_count = 5;
-    repeated RackInfo rack_infos = 6;
-    uint64 remote_volume_count = 7;
-    uint64 max_ssd_volume_count = 8;
-    uint64 ssd_volume_count = 9;
+    repeated RackInfo rack_infos = 2;
+    map<string, DiskInfo> diskInfos = 3;
 }
 message TopologyInfo {
     string id = 1;
-    uint64 volume_count = 2;
-    uint64 max_volume_count = 3;
-    uint64 free_volume_count = 4;
-    uint64 active_volume_count = 5;
-    repeated DataCenterInfo data_center_infos = 6;
-    uint64 remote_volume_count = 7;
-    uint64 max_ssd_volume_count = 8;
-    uint64 ssd_volume_count = 9;
+    repeated DataCenterInfo data_center_infos = 2;
+    map<string, DiskInfo> diskInfos = 3;
 }
 message VolumeListRequest {
 }
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 9f59f5c86..9b49d2df5 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -49,11 +49,10 @@ type Heartbeat struct {
 	// erasure coding
 	EcShards []*VolumeEcShardInformationMessage `protobuf:"bytes,16,rep,name=ec_shards,json=ecShards,proto3" json:"ec_shards,omitempty"`
 	// delta erasure coding shards
-	NewEcShards       []*VolumeEcShardInformationMessage `protobuf:"bytes,17,rep,name=new_ec_shards,json=newEcShards,proto3" json:"new_ec_shards,omitempty"`
-	DeletedEcShards   []*VolumeEcShardInformationMessage `protobuf:"bytes,18,rep,name=deleted_ec_shards,json=deletedEcShards,proto3" json:"deleted_ec_shards,omitempty"`
-	HasNoEcShards     bool                               `protobuf:"varint,19,opt,name=has_no_ec_shards,json=hasNoEcShards,proto3" json:"has_no_ec_shards,omitempty"`
-	MaxVolumeCount    uint32                             `protobuf:"varint,4,opt,name=max_volume_count,json=maxVolumeCount,proto3" json:"max_volume_count,omitempty"`
-	MaxSsdVolumeCount uint32                             `protobuf:"varint,20,opt,name=max_ssd_volume_count,json=maxSsdVolumeCount,proto3" json:"max_ssd_volume_count,omitempty"`
+	NewEcShards     []*VolumeEcShardInformationMessage `protobuf:"bytes,17,rep,name=new_ec_shards,json=newEcShards,proto3" json:"new_ec_shards,omitempty"`
+	DeletedEcShards []*VolumeEcShardInformationMessage `protobuf:"bytes,18,rep,name=deleted_ec_shards,json=deletedEcShards,proto3" json:"deleted_ec_shards,omitempty"`
+	HasNoEcShards   bool                               `protobuf:"varint,19,opt,name=has_no_ec_shards,json=hasNoEcShards,proto3" json:"has_no_ec_shards,omitempty"`
+	MaxVolumeCounts map[string]uint32                  `protobuf:"bytes,4,rep,name=max_volume_counts,json=maxVolumeCounts,proto3" json:"max_volume_counts,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
 }
 
 func (x *Heartbeat) Reset() {
@@ -193,18 +192,11 @@ func (x *Heartbeat) GetHasNoEcShards() bool {
 	return false
 }
 
-func (x *Heartbeat) GetMaxVolumeCount() uint32 {
+func (x *Heartbeat) GetMaxVolumeCounts() map[string]uint32 {
 	if x != nil {
-		return x.MaxVolumeCount
-	}
-	return 0
-}
-
-func (x *Heartbeat) GetMaxSsdVolumeCount() uint32 {
-	if x != nil {
-		return x.MaxSsdVolumeCount
+		return x.MaxVolumeCounts
 	}
-	return 0
+	return nil
 }
 
 type HeartbeatResponse struct {
@@ -540,6 +532,7 @@ type VolumeEcShardInformationMessage struct {
 	Id          uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
 	Collection  string `protobuf:"bytes,2,opt,name=collection,proto3" json:"collection,omitempty"`
 	EcIndexBits uint32 `protobuf:"varint,3,opt,name=ec_index_bits,json=ecIndexBits,proto3" json:"ec_index_bits,omitempty"`
+	DiskType    string `protobuf:"bytes,4,opt,name=disk_type,json=diskType,proto3" json:"disk_type,omitempty"`
 }
 
 func (x *VolumeEcShardInformationMessage) Reset() {
@@ -595,6 +588,13 @@ func (x *VolumeEcShardInformationMessage) GetEcIndexBits() uint32 {
 	return 0
 }
 
+func (x *VolumeEcShardInformationMessage) GetDiskType() string {
+	if x != nil {
+		return x.DiskType
+	}
+	return ""
+}
+
 type StorageBackend struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1622,12 +1622,12 @@ func (*CollectionDeleteResponse) Descriptor() ([]byte, []int) {
 //
 // volume related
 //
-type DataNodeInfo struct {
+type DiskInfo struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Id                string                             `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Type              string                             `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
 	VolumeCount       uint64                             `protobuf:"varint,2,opt,name=volume_count,json=volumeCount,proto3" json:"volume_count,omitempty"`
 	MaxVolumeCount    uint64                             `protobuf:"varint,3,opt,name=max_volume_count,json=maxVolumeCount,proto3" json:"max_volume_count,omitempty"`
 	FreeVolumeCount   uint64                             `protobuf:"varint,4,opt,name=free_volume_count,json=freeVolumeCount,proto3" json:"free_volume_count,omitempty"`
@@ -1635,12 +1635,10 @@ type DataNodeInfo struct {
 	VolumeInfos       []*VolumeInformationMessage        `protobuf:"bytes,6,rep,name=volume_infos,json=volumeInfos,proto3" json:"volume_infos,omitempty"`
 	EcShardInfos      []*VolumeEcShardInformationMessage `protobuf:"bytes,7,rep,name=ec_shard_infos,json=ecShardInfos,proto3" json:"ec_shard_infos,omitempty"`
 	RemoteVolumeCount uint64                             `protobuf:"varint,8,opt,name=remote_volume_count,json=remoteVolumeCount,proto3" json:"remote_volume_count,omitempty"`
-	MaxSsdVolumeCount uint64                             `protobuf:"varint,9,opt,name=max_ssd_volume_count,json=maxSsdVolumeCount,proto3" json:"max_ssd_volume_count,omitempty"`
-	SsdVolumeCount    uint64                             `protobuf:"varint,10,opt,name=ssd_volume_count,json=ssdVolumeCount,proto3" json:"ssd_volume_count,omitempty"`
 }
 
-func (x *DataNodeInfo) Reset() {
-	*x = DataNodeInfo{}
+func (x *DiskInfo) Reset() {
+	*x = DiskInfo{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_master_proto_msgTypes[22]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1648,13 +1646,13 @@ func (x *DataNodeInfo) Reset() {
 	}
 }
 
-func (x *DataNodeInfo) String() string {
+func (x *DiskInfo) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*DataNodeInfo) ProtoMessage() {}
+func (*DiskInfo) ProtoMessage() {}
 
-func (x *DataNodeInfo) ProtoReflect() protoreflect.Message {
+func (x *DiskInfo) ProtoReflect() protoreflect.Message {
 	mi := &file_master_proto_msgTypes[22]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1666,99 +1664,78 @@ func (x *DataNodeInfo) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use DataNodeInfo.ProtoReflect.Descriptor instead.
-func (*DataNodeInfo) Descriptor() ([]byte, []int) {
+// Deprecated: Use DiskInfo.ProtoReflect.Descriptor instead.
+func (*DiskInfo) Descriptor() ([]byte, []int) {
 	return file_master_proto_rawDescGZIP(), []int{22}
 }
 
-func (x *DataNodeInfo) GetId() string {
+func (x *DiskInfo) GetType() string {
 	if x != nil {
-		return x.Id
+		return x.Type
 	}
 	return ""
 }
 
-func (x *DataNodeInfo) GetVolumeCount() uint64 {
+func (x *DiskInfo) GetVolumeCount() uint64 {
 	if x != nil {
 		return x.VolumeCount
 	}
 	return 0
 }
 
-func (x *DataNodeInfo) GetMaxVolumeCount() uint64 {
+func (x *DiskInfo) GetMaxVolumeCount() uint64 {
 	if x != nil {
 		return x.MaxVolumeCount
 	}
 	return 0
 }
 
-func (x *DataNodeInfo) GetFreeVolumeCount() uint64 {
+func (x *DiskInfo) GetFreeVolumeCount() uint64 {
 	if x != nil {
 		return x.FreeVolumeCount
 	}
 	return 0
 }
 
-func (x *DataNodeInfo) GetActiveVolumeCount() uint64 {
+func (x *DiskInfo) GetActiveVolumeCount() uint64 {
 	if x != nil {
 		return x.ActiveVolumeCount
 	}
 	return 0
 }
 
-func (x *DataNodeInfo) GetVolumeInfos() []*VolumeInformationMessage {
+func (x *DiskInfo) GetVolumeInfos() []*VolumeInformationMessage {
 	if x != nil {
 		return x.VolumeInfos
 	}
 	return nil
 }
 
-func (x *DataNodeInfo) GetEcShardInfos() []*VolumeEcShardInformationMessage {
+func (x *DiskInfo) GetEcShardInfos() []*VolumeEcShardInformationMessage {
 	if x != nil {
 		return x.EcShardInfos
 	}
 	return nil
 }
 
-func (x *DataNodeInfo) GetRemoteVolumeCount() uint64 {
+func (x *DiskInfo) GetRemoteVolumeCount() uint64 {
 	if x != nil {
 		return x.RemoteVolumeCount
 	}
 	return 0
 }
 
-func (x *DataNodeInfo) GetMaxSsdVolumeCount() uint64 {
-	if x != nil {
-		return x.MaxSsdVolumeCount
-	}
-	return 0
-}
-
-func (x *DataNodeInfo) GetSsdVolumeCount() uint64 {
-	if x != nil {
-		return x.SsdVolumeCount
-	}
-	return 0
-}
-
-type RackInfo struct {
+type DataNodeInfo struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Id                string          `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	VolumeCount       uint64          `protobuf:"varint,2,opt,name=volume_count,json=volumeCount,proto3" json:"volume_count,omitempty"`
-	MaxVolumeCount    uint64          `protobuf:"varint,3,opt,name=max_volume_count,json=maxVolumeCount,proto3" json:"max_volume_count,omitempty"`
-	FreeVolumeCount   uint64          `protobuf:"varint,4,opt,name=free_volume_count,json=freeVolumeCount,proto3" json:"free_volume_count,omitempty"`
-	ActiveVolumeCount uint64          `protobuf:"varint,5,opt,name=active_volume_count,json=activeVolumeCount,proto3" json:"active_volume_count,omitempty"`
-	DataNodeInfos     []*DataNodeInfo `protobuf:"bytes,6,rep,name=data_node_infos,json=dataNodeInfos,proto3" json:"data_node_infos,omitempty"`
-	RemoteVolumeCount uint64          `protobuf:"varint,7,opt,name=remote_volume_count,json=remoteVolumeCount,proto3" json:"remote_volume_count,omitempty"`
-	MaxSsdVolumeCount uint64          `protobuf:"varint,8,opt,name=max_ssd_volume_count,json=maxSsdVolumeCount,proto3" json:"max_ssd_volume_count,omitempty"`
-	SsdVolumeCount    uint64          `protobuf:"varint,9,opt,name=ssd_volume_count,json=ssdVolumeCount,proto3" json:"ssd_volume_count,omitempty"`
+	Id        string               `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	DiskInfos map[string]*DiskInfo `protobuf:"bytes,2,rep,name=diskInfos,proto3" json:"diskInfos,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
-func (x *RackInfo) Reset() {
-	*x = RackInfo{}
+func (x *DataNodeInfo) Reset() {
+	*x = DataNodeInfo{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_master_proto_msgTypes[23]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1766,13 +1743,13 @@ func (x *RackInfo) Reset() {
 	}
 }
 
-func (x *RackInfo) String() string {
+func (x *DataNodeInfo) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*RackInfo) ProtoMessage() {}
+func (*DataNodeInfo) ProtoMessage() {}
 
-func (x *RackInfo) ProtoReflect() protoreflect.Message {
+func (x *DataNodeInfo) ProtoReflect() protoreflect.Message {
 	mi := &file_master_proto_msgTypes[23]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1784,72 +1761,86 @@ func (x *RackInfo) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use RackInfo.ProtoReflect.Descriptor instead.
-func (*RackInfo) Descriptor() ([]byte, []int) {
+// Deprecated: Use DataNodeInfo.ProtoReflect.Descriptor instead.
+func (*DataNodeInfo) Descriptor() ([]byte, []int) {
 	return file_master_proto_rawDescGZIP(), []int{23}
 }
 
-func (x *RackInfo) GetId() string {
+func (x *DataNodeInfo) GetId() string {
 	if x != nil {
 		return x.Id
 	}
 	return ""
 }
 
-func (x *RackInfo) GetVolumeCount() uint64 {
+func (x *DataNodeInfo) GetDiskInfos() map[string]*DiskInfo {
 	if x != nil {
-		return x.VolumeCount
+		return x.DiskInfos
 	}
-	return 0
+	return nil
 }
 
-func (x *RackInfo) GetMaxVolumeCount() uint64 {
-	if x != nil {
-		return x.MaxVolumeCount
-	}
-	return 0
+type RackInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Id            string               `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	DataNodeInfos []*DataNodeInfo      `protobuf:"bytes,2,rep,name=data_node_infos,json=dataNodeInfos,proto3" json:"data_node_infos,omitempty"`
+	DiskInfos     map[string]*DiskInfo `protobuf:"bytes,3,rep,name=diskInfos,proto3" json:"diskInfos,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
-func (x *RackInfo) GetFreeVolumeCount() uint64 {
-	if x != nil {
-		return x.FreeVolumeCount
+func (x *RackInfo) Reset() {
+	*x = RackInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[24]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
 	}
-	return 0
 }
 
-func (x *RackInfo) GetActiveVolumeCount() uint64 {
-	if x != nil {
-		return x.ActiveVolumeCount
-	}
-	return 0
+func (x *RackInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
 }
 
-func (x *RackInfo) GetDataNodeInfos() []*DataNodeInfo {
-	if x != nil {
-		return x.DataNodeInfos
+func (*RackInfo) ProtoMessage() {}
+
+func (x *RackInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[24]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
 	}
-	return nil
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RackInfo.ProtoReflect.Descriptor instead.
+func (*RackInfo) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{24}
 }
 
-func (x *RackInfo) GetRemoteVolumeCount() uint64 {
+func (x *RackInfo) GetId() string {
 	if x != nil {
-		return x.RemoteVolumeCount
+		return x.Id
 	}
-	return 0
+	return ""
 }
 
-func (x *RackInfo) GetMaxSsdVolumeCount() uint64 {
+func (x *RackInfo) GetDataNodeInfos() []*DataNodeInfo {
 	if x != nil {
-		return x.MaxSsdVolumeCount
+		return x.DataNodeInfos
 	}
-	return 0
+	return nil
 }
 
-func (x *RackInfo) GetSsdVolumeCount() uint64 {
+func (x *RackInfo) GetDiskInfos() map[string]*DiskInfo {
 	if x != nil {
-		return x.SsdVolumeCount
+		return x.DiskInfos
 	}
-	return 0
+	return nil
 }
 
 type DataCenterInfo struct {
@@ -1857,21 +1848,15 @@ type DataCenterInfo struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Id                string      `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	VolumeCount       uint64      `protobuf:"varint,2,opt,name=volume_count,json=volumeCount,proto3" json:"volume_count,omitempty"`
-	MaxVolumeCount    uint64      `protobuf:"varint,3,opt,name=max_volume_count,json=maxVolumeCount,proto3" json:"max_volume_count,omitempty"`
-	FreeVolumeCount   uint64      `protobuf:"varint,4,opt,name=free_volume_count,json=freeVolumeCount,proto3" json:"free_volume_count,omitempty"`
-	ActiveVolumeCount uint64      `protobuf:"varint,5,opt,name=active_volume_count,json=activeVolumeCount,proto3" json:"active_volume_count,omitempty"`
-	RackInfos         []*RackInfo `protobuf:"bytes,6,rep,name=rack_infos,json=rackInfos,proto3" json:"rack_infos,omitempty"`
-	RemoteVolumeCount uint64      `protobuf:"varint,7,opt,name=remote_volume_count,json=remoteVolumeCount,proto3" json:"remote_volume_count,omitempty"`
-	MaxSsdVolumeCount uint64      `protobuf:"varint,8,opt,name=max_ssd_volume_count,json=maxSsdVolumeCount,proto3" json:"max_ssd_volume_count,omitempty"`
-	SsdVolumeCount    uint64      `protobuf:"varint,9,opt,name=ssd_volume_count,json=ssdVolumeCount,proto3" json:"ssd_volume_count,omitempty"`
+	Id        string               `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	RackInfos []*RackInfo          `protobuf:"bytes,2,rep,name=rack_infos,json=rackInfos,proto3" json:"rack_infos,omitempty"`
+	DiskInfos map[string]*DiskInfo `protobuf:"bytes,3,rep,name=diskInfos,proto3" json:"diskInfos,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *DataCenterInfo) Reset() {
 	*x = DataCenterInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[24]
+		mi := &file_master_proto_msgTypes[25]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1884,7 +1869,7 @@ func (x *DataCenterInfo) String() string {
 func (*DataCenterInfo) ProtoMessage() {}
 
 func (x *DataCenterInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[24]
+	mi := &file_master_proto_msgTypes[25]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1897,7 +1882,7 @@ func (x *DataCenterInfo) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DataCenterInfo.ProtoReflect.Descriptor instead.
 func (*DataCenterInfo) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{24}
+	return file_master_proto_rawDescGZIP(), []int{25}
 }
 
 func (x *DataCenterInfo) GetId() string {
@@ -1907,34 +1892,6 @@ func (x *DataCenterInfo) GetId() string {
 	return ""
 }
 
-func (x *DataCenterInfo) GetVolumeCount() uint64 {
-	if x != nil {
-		return x.VolumeCount
-	}
-	return 0
-}
-
-func (x *DataCenterInfo) GetMaxVolumeCount() uint64 {
-	if x != nil {
-		return x.MaxVolumeCount
-	}
-	return 0
-}
-
-func (x *DataCenterInfo) GetFreeVolumeCount() uint64 {
-	if x != nil {
-		return x.FreeVolumeCount
-	}
-	return 0
-}
-
-func (x *DataCenterInfo) GetActiveVolumeCount() uint64 {
-	if x != nil {
-		return x.ActiveVolumeCount
-	}
-	return 0
-}
-
 func (x *DataCenterInfo) GetRackInfos() []*RackInfo {
 	if x != nil {
 		return x.RackInfos
@@ -1942,25 +1899,11 @@ func (x *DataCenterInfo) GetRackInfos() []*RackInfo {
 	return nil
 }
 
-func (x *DataCenterInfo) GetRemoteVolumeCount() uint64 {
+func (x *DataCenterInfo) GetDiskInfos() map[string]*DiskInfo {
 	if x != nil {
-		return x.RemoteVolumeCount
+		return x.DiskInfos
 	}
-	return 0
-}
-
-func (x *DataCenterInfo) GetMaxSsdVolumeCount() uint64 {
-	if x != nil {
-		return x.MaxSsdVolumeCount
-	}
-	return 0
-}
-
-func (x *DataCenterInfo) GetSsdVolumeCount() uint64 {
-	if x != nil {
-		return x.SsdVolumeCount
-	}
-	return 0
+	return nil
 }
 
 type TopologyInfo struct {
@@ -1968,21 +1911,15 @@ type TopologyInfo struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Id                string            `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	VolumeCount       uint64            `protobuf:"varint,2,opt,name=volume_count,json=volumeCount,proto3" json:"volume_count,omitempty"`
-	MaxVolumeCount    uint64            `protobuf:"varint,3,opt,name=max_volume_count,json=maxVolumeCount,proto3" json:"max_volume_count,omitempty"`
-	FreeVolumeCount   uint64            `protobuf:"varint,4,opt,name=free_volume_count,json=freeVolumeCount,proto3" json:"free_volume_count,omitempty"`
-	ActiveVolumeCount uint64            `protobuf:"varint,5,opt,name=active_volume_count,json=activeVolumeCount,proto3" json:"active_volume_count,omitempty"`
-	DataCenterInfos   []*DataCenterInfo `protobuf:"bytes,6,rep,name=data_center_infos,json=dataCenterInfos,proto3" json:"data_center_infos,omitempty"`
-	RemoteVolumeCount uint64            `protobuf:"varint,7,opt,name=remote_volume_count,json=remoteVolumeCount,proto3" json:"remote_volume_count,omitempty"`
-	MaxSsdVolumeCount uint64            `protobuf:"varint,8,opt,name=max_ssd_volume_count,json=maxSsdVolumeCount,proto3" json:"max_ssd_volume_count,omitempty"`
-	SsdVolumeCount    uint64            `protobuf:"varint,9,opt,name=ssd_volume_count,json=ssdVolumeCount,proto3" json:"ssd_volume_count,omitempty"`
+	Id              string               `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	DataCenterInfos []*DataCenterInfo    `protobuf:"bytes,2,rep,name=data_center_infos,json=dataCenterInfos,proto3" json:"data_center_infos,omitempty"`
+	DiskInfos       map[string]*DiskInfo `protobuf:"bytes,3,rep,name=diskInfos,proto3" json:"diskInfos,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *TopologyInfo) Reset() {
 	*x = TopologyInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[25]
+		mi := &file_master_proto_msgTypes[26]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1995,7 +1932,7 @@ func (x *TopologyInfo) String() string {
 func (*TopologyInfo) ProtoMessage() {}
 
 func (x *TopologyInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[25]
+	mi := &file_master_proto_msgTypes[26]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2008,7 +1945,7 @@ func (x *TopologyInfo) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TopologyInfo.ProtoReflect.Descriptor instead.
 func (*TopologyInfo) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{25}
+	return file_master_proto_rawDescGZIP(), []int{26}
 }
 
 func (x *TopologyInfo) GetId() string {
@@ -2018,34 +1955,6 @@ func (x *TopologyInfo) GetId() string {
 	return ""
 }
 
-func (x *TopologyInfo) GetVolumeCount() uint64 {
-	if x != nil {
-		return x.VolumeCount
-	}
-	return 0
-}
-
-func (x *TopologyInfo) GetMaxVolumeCount() uint64 {
-	if x != nil {
-		return x.MaxVolumeCount
-	}
-	return 0
-}
-
-func (x *TopologyInfo) GetFreeVolumeCount() uint64 {
-	if x != nil {
-		return x.FreeVolumeCount
-	}
-	return 0
-}
-
-func (x *TopologyInfo) GetActiveVolumeCount() uint64 {
-	if x != nil {
-		return x.ActiveVolumeCount
-	}
-	return 0
-}
-
 func (x *TopologyInfo) GetDataCenterInfos() []*DataCenterInfo {
 	if x != nil {
 		return x.DataCenterInfos
@@ -2053,25 +1962,11 @@ func (x *TopologyInfo) GetDataCenterInfos() []*DataCenterInfo {
 	return nil
 }
 
-func (x *TopologyInfo) GetRemoteVolumeCount() uint64 {
+func (x *TopologyInfo) GetDiskInfos() map[string]*DiskInfo {
 	if x != nil {
-		return x.RemoteVolumeCount
+		return x.DiskInfos
 	}
-	return 0
-}
-
-func (x *TopologyInfo) GetMaxSsdVolumeCount() uint64 {
-	if x != nil {
-		return x.MaxSsdVolumeCount
-	}
-	return 0
-}
-
-func (x *TopologyInfo) GetSsdVolumeCount() uint64 {
-	if x != nil {
-		return x.SsdVolumeCount
-	}
-	return 0
+	return nil
 }
 
 type VolumeListRequest struct {
@@ -2083,7 +1978,7 @@ type VolumeListRequest struct {
 func (x *VolumeListRequest) Reset() {
 	*x = VolumeListRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[26]
+		mi := &file_master_proto_msgTypes[27]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2096,7 +1991,7 @@ func (x *VolumeListRequest) String() string {
 func (*VolumeListRequest) ProtoMessage() {}
 
 func (x *VolumeListRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[26]
+	mi := &file_master_proto_msgTypes[27]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2109,7 +2004,7 @@ func (x *VolumeListRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use VolumeListRequest.ProtoReflect.Descriptor instead.
 func (*VolumeListRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{26}
+	return file_master_proto_rawDescGZIP(), []int{27}
 }
 
 type VolumeListResponse struct {
@@ -2124,7 +2019,7 @@ type VolumeListResponse struct {
 func (x *VolumeListResponse) Reset() {
 	*x = VolumeListResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[27]
+		mi := &file_master_proto_msgTypes[28]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2137,7 +2032,7 @@ func (x *VolumeListResponse) String() string {
 func (*VolumeListResponse) ProtoMessage() {}
 
 func (x *VolumeListResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[27]
+	mi := &file_master_proto_msgTypes[28]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2150,7 +2045,7 @@ func (x *VolumeListResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use VolumeListResponse.ProtoReflect.Descriptor instead.
 func (*VolumeListResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{27}
+	return file_master_proto_rawDescGZIP(), []int{28}
 }
 
 func (x *VolumeListResponse) GetTopologyInfo() *TopologyInfo {
@@ -2178,7 +2073,7 @@ type LookupEcVolumeRequest struct {
 func (x *LookupEcVolumeRequest) Reset() {
 	*x = LookupEcVolumeRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[28]
+		mi := &file_master_proto_msgTypes[29]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2191,7 +2086,7 @@ func (x *LookupEcVolumeRequest) String() string {
 func (*LookupEcVolumeRequest) ProtoMessage() {}
 
 func (x *LookupEcVolumeRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[28]
+	mi := &file_master_proto_msgTypes[29]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2204,7 +2099,7 @@ func (x *LookupEcVolumeRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LookupEcVolumeRequest.ProtoReflect.Descriptor instead.
 func (*LookupEcVolumeRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{28}
+	return file_master_proto_rawDescGZIP(), []int{29}
 }
 
 func (x *LookupEcVolumeRequest) GetVolumeId() uint32 {
@@ -2226,7 +2121,7 @@ type LookupEcVolumeResponse struct {
 func (x *LookupEcVolumeResponse) Reset() {
 	*x = LookupEcVolumeResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[29]
+		mi := &file_master_proto_msgTypes[30]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2239,7 +2134,7 @@ func (x *LookupEcVolumeResponse) String() string {
 func (*LookupEcVolumeResponse) ProtoMessage() {}
 
 func (x *LookupEcVolumeResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[29]
+	mi := &file_master_proto_msgTypes[30]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2252,7 +2147,7 @@ func (x *LookupEcVolumeResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LookupEcVolumeResponse.ProtoReflect.Descriptor instead.
 func (*LookupEcVolumeResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{29}
+	return file_master_proto_rawDescGZIP(), []int{30}
 }
 
 func (x *LookupEcVolumeResponse) GetVolumeId() uint32 {
@@ -2280,7 +2175,7 @@ type VacuumVolumeRequest struct {
 func (x *VacuumVolumeRequest) Reset() {
 	*x = VacuumVolumeRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[30]
+		mi := &file_master_proto_msgTypes[31]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2293,7 +2188,7 @@ func (x *VacuumVolumeRequest) String() string {
 func (*VacuumVolumeRequest) ProtoMessage() {}
 
 func (x *VacuumVolumeRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[30]
+	mi := &file_master_proto_msgTypes[31]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2306,7 +2201,7 @@ func (x *VacuumVolumeRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use VacuumVolumeRequest.ProtoReflect.Descriptor instead.
 func (*VacuumVolumeRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{30}
+	return file_master_proto_rawDescGZIP(), []int{31}
 }
 
 func (x *VacuumVolumeRequest) GetGarbageThreshold() float32 {
@@ -2325,7 +2220,7 @@ type VacuumVolumeResponse struct {
 func (x *VacuumVolumeResponse) Reset() {
 	*x = VacuumVolumeResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[31]
+		mi := &file_master_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2338,7 +2233,7 @@ func (x *VacuumVolumeResponse) String() string {
 func (*VacuumVolumeResponse) ProtoMessage() {}
 
 func (x *VacuumVolumeResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[31]
+	mi := &file_master_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2351,7 +2246,7 @@ func (x *VacuumVolumeResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use VacuumVolumeResponse.ProtoReflect.Descriptor instead.
 func (*VacuumVolumeResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{31}
+	return file_master_proto_rawDescGZIP(), []int{32}
 }
 
 type GetMasterConfigurationRequest struct {
@@ -2363,7 +2258,7 @@ type GetMasterConfigurationRequest struct {
 func (x *GetMasterConfigurationRequest) Reset() {
 	*x = GetMasterConfigurationRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[32]
+		mi := &file_master_proto_msgTypes[33]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2376,7 +2271,7 @@ func (x *GetMasterConfigurationRequest) String() string {
 func (*GetMasterConfigurationRequest) ProtoMessage() {}
 
 func (x *GetMasterConfigurationRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[32]
+	mi := &file_master_proto_msgTypes[33]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2389,7 +2284,7 @@ func (x *GetMasterConfigurationRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetMasterConfigurationRequest.ProtoReflect.Descriptor instead.
 func (*GetMasterConfigurationRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{32}
+	return file_master_proto_rawDescGZIP(), []int{33}
 }
 
 type GetMasterConfigurationResponse struct {
@@ -2407,7 +2302,7 @@ type GetMasterConfigurationResponse struct {
 func (x *GetMasterConfigurationResponse) Reset() {
 	*x = GetMasterConfigurationResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[33]
+		mi := &file_master_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2420,7 +2315,7 @@ func (x *GetMasterConfigurationResponse) String() string {
 func (*GetMasterConfigurationResponse) ProtoMessage() {}
 
 func (x *GetMasterConfigurationResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[33]
+	mi := &file_master_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2433,7 +2328,7 @@ func (x *GetMasterConfigurationResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetMasterConfigurationResponse.ProtoReflect.Descriptor instead.
 func (*GetMasterConfigurationResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{33}
+	return file_master_proto_rawDescGZIP(), []int{34}
 }
 
 func (x *GetMasterConfigurationResponse) GetMetricsAddress() string {
@@ -2482,7 +2377,7 @@ type ListMasterClientsRequest struct {
 func (x *ListMasterClientsRequest) Reset() {
 	*x = ListMasterClientsRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[34]
+		mi := &file_master_proto_msgTypes[35]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2495,7 +2390,7 @@ func (x *ListMasterClientsRequest) String() string {
 func (*ListMasterClientsRequest) ProtoMessage() {}
 
 func (x *ListMasterClientsRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[34]
+	mi := &file_master_proto_msgTypes[35]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2508,7 +2403,7 @@ func (x *ListMasterClientsRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListMasterClientsRequest.ProtoReflect.Descriptor instead.
 func (*ListMasterClientsRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{34}
+	return file_master_proto_rawDescGZIP(), []int{35}
 }
 
 func (x *ListMasterClientsRequest) GetClientType() string {
@@ -2529,7 +2424,7 @@ type ListMasterClientsResponse struct {
 func (x *ListMasterClientsResponse) Reset() {
 	*x = ListMasterClientsResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[35]
+		mi := &file_master_proto_msgTypes[36]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2542,7 +2437,7 @@ func (x *ListMasterClientsResponse) String() string {
 func (*ListMasterClientsResponse) ProtoMessage() {}
 
 func (x *ListMasterClientsResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[35]
+	mi := &file_master_proto_msgTypes[36]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2555,7 +2450,7 @@ func (x *ListMasterClientsResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListMasterClientsResponse.ProtoReflect.Descriptor instead.
 func (*ListMasterClientsResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{35}
+	return file_master_proto_rawDescGZIP(), []int{36}
 }
 
 func (x *ListMasterClientsResponse) GetGrpcAddresses() []string {
@@ -2578,7 +2473,7 @@ type LeaseAdminTokenRequest struct {
 func (x *LeaseAdminTokenRequest) Reset() {
 	*x = LeaseAdminTokenRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[36]
+		mi := &file_master_proto_msgTypes[37]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2591,7 +2486,7 @@ func (x *LeaseAdminTokenRequest) String() string {
 func (*LeaseAdminTokenRequest) ProtoMessage() {}
 
 func (x *LeaseAdminTokenRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[36]
+	mi := &file_master_proto_msgTypes[37]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2604,7 +2499,7 @@ func (x *LeaseAdminTokenRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LeaseAdminTokenRequest.ProtoReflect.Descriptor instead.
 func (*LeaseAdminTokenRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{36}
+	return file_master_proto_rawDescGZIP(), []int{37}
 }
 
 func (x *LeaseAdminTokenRequest) GetPreviousToken() int64 {
@@ -2640,7 +2535,7 @@ type LeaseAdminTokenResponse struct {
 func (x *LeaseAdminTokenResponse) Reset() {
 	*x = LeaseAdminTokenResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[37]
+		mi := &file_master_proto_msgTypes[38]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2653,7 +2548,7 @@ func (x *LeaseAdminTokenResponse) String() string {
 func (*LeaseAdminTokenResponse) ProtoMessage() {}
 
 func (x *LeaseAdminTokenResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[37]
+	mi := &file_master_proto_msgTypes[38]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2666,7 +2561,7 @@ func (x *LeaseAdminTokenResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LeaseAdminTokenResponse.ProtoReflect.Descriptor instead.
 func (*LeaseAdminTokenResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{37}
+	return file_master_proto_rawDescGZIP(), []int{38}
 }
 
 func (x *LeaseAdminTokenResponse) GetToken() int64 {
@@ -2696,7 +2591,7 @@ type ReleaseAdminTokenRequest struct {
 func (x *ReleaseAdminTokenRequest) Reset() {
 	*x = ReleaseAdminTokenRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[38]
+		mi := &file_master_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2709,7 +2604,7 @@ func (x *ReleaseAdminTokenRequest) String() string {
 func (*ReleaseAdminTokenRequest) ProtoMessage() {}
 
 func (x *ReleaseAdminTokenRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[38]
+	mi := &file_master_proto_msgTypes[39]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2722,7 +2617,7 @@ func (x *ReleaseAdminTokenRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ReleaseAdminTokenRequest.ProtoReflect.Descriptor instead.
 func (*ReleaseAdminTokenRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{38}
+	return file_master_proto_rawDescGZIP(), []int{39}
 }
 
 func (x *ReleaseAdminTokenRequest) GetPreviousToken() int64 {
@@ -2755,7 +2650,7 @@ type ReleaseAdminTokenResponse struct {
 func (x *ReleaseAdminTokenResponse) Reset() {
 	*x = ReleaseAdminTokenResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[39]
+		mi := &file_master_proto_msgTypes[40]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2768,7 +2663,7 @@ func (x *ReleaseAdminTokenResponse) String() string {
 func (*ReleaseAdminTokenResponse) ProtoMessage() {}
 
 func (x *ReleaseAdminTokenResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[39]
+	mi := &file_master_proto_msgTypes[40]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2781,7 +2676,7 @@ func (x *ReleaseAdminTokenResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ReleaseAdminTokenResponse.ProtoReflect.Descriptor instead.
 func (*ReleaseAdminTokenResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{39}
+	return file_master_proto_rawDescGZIP(), []int{40}
 }
 
 type SuperBlockExtra_ErasureCoding struct {
@@ -2797,7 +2692,7 @@ type SuperBlockExtra_ErasureCoding struct {
 func (x *SuperBlockExtra_ErasureCoding) Reset() {
 	*x = SuperBlockExtra_ErasureCoding{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[41]
+		mi := &file_master_proto_msgTypes[43]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2810,7 +2705,7 @@ func (x *SuperBlockExtra_ErasureCoding) String() string {
 func (*SuperBlockExtra_ErasureCoding) ProtoMessage() {}
 
 func (x *SuperBlockExtra_ErasureCoding) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[41]
+	mi := &file_master_proto_msgTypes[43]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2860,7 +2755,7 @@ type LookupVolumeResponse_VolumeIdLocation struct {
 func (x *LookupVolumeResponse_VolumeIdLocation) Reset() {
 	*x = LookupVolumeResponse_VolumeIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[42]
+		mi := &file_master_proto_msgTypes[44]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2873,7 +2768,7 @@ func (x *LookupVolumeResponse_VolumeIdLocation) String() string {
 func (*LookupVolumeResponse_VolumeIdLocation) ProtoMessage() {}
 
 func (x *LookupVolumeResponse_VolumeIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[42]
+	mi := &file_master_proto_msgTypes[44]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2922,7 +2817,7 @@ type LookupEcVolumeResponse_EcShardIdLocation struct {
 func (x *LookupEcVolumeResponse_EcShardIdLocation) Reset() {
 	*x = LookupEcVolumeResponse_EcShardIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[43]
+		mi := &file_master_proto_msgTypes[49]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2935,7 +2830,7 @@ func (x *LookupEcVolumeResponse_EcShardIdLocation) String() string {
 func (*LookupEcVolumeResponse_EcShardIdLocation) ProtoMessage() {}
 
 func (x *LookupEcVolumeResponse_EcShardIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[43]
+	mi := &file_master_proto_msgTypes[49]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2948,7 +2843,7 @@ func (x *LookupEcVolumeResponse_EcShardIdLocation) ProtoReflect() protoreflect.M
 
 // Deprecated: Use LookupEcVolumeResponse_EcShardIdLocation.ProtoReflect.Descriptor instead.
 func (*LookupEcVolumeResponse_EcShardIdLocation) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{29, 0}
+	return file_master_proto_rawDescGZIP(), []int{30, 0}
 }
 
 func (x *LookupEcVolumeResponse_EcShardIdLocation) GetShardId() uint32 {
@@ -2969,7 +2864,7 @@ var File_master_proto protoreflect.FileDescriptor
 
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 }
 
 var (
@@ -3511,52 +3388,58 @@ func file_master_proto_rawDescGZIP() []byte {
 	return file_master_proto_rawDescData
 }
 
-var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 44)
+var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 50)
 var file_master_proto_goTypes = []interface{}{
-	(*Heartbeat)(nil),                                // 0: master_pb.Heartbeat
-	(*HeartbeatResponse)(nil),                        // 1: master_pb.HeartbeatResponse
-	(*VolumeInformationMessage)(nil),                 // 2: master_pb.VolumeInformationMessage
-	(*VolumeShortInformationMessage)(nil),            // 3: master_pb.VolumeShortInformationMessage
-	(*VolumeEcShardInformationMessage)(nil),          // 4: master_pb.VolumeEcShardInformationMessage
-	(*StorageBackend)(nil),                           // 5: master_pb.StorageBackend
-	(*Empty)(nil),                                    // 6: master_pb.Empty
-	(*SuperBlockExtra)(nil),                          // 7: master_pb.SuperBlockExtra
-	(*KeepConnectedRequest)(nil),                     // 8: master_pb.KeepConnectedRequest
-	(*VolumeLocation)(nil),                           // 9: master_pb.VolumeLocation
-	(*LookupVolumeRequest)(nil),                      // 10: master_pb.LookupVolumeRequest
-	(*LookupVolumeResponse)(nil),                     // 11: master_pb.LookupVolumeResponse
-	(*Location)(nil),                                 // 12: master_pb.Location
-	(*AssignRequest)(nil),                            // 13: master_pb.AssignRequest
-	(*AssignResponse)(nil),                           // 14: master_pb.AssignResponse
-	(*StatisticsRequest)(nil),                        // 15: master_pb.StatisticsRequest
-	(*StatisticsResponse)(nil),                       // 16: master_pb.StatisticsResponse
-	(*Collection)(nil),                               // 17: master_pb.Collection
-	(*CollectionListRequest)(nil),                    // 18: master_pb.CollectionListRequest
-	(*CollectionListResponse)(nil),                   // 19: master_pb.CollectionListResponse
-	(*CollectionDeleteRequest)(nil),                  // 20: master_pb.CollectionDeleteRequest
-	(*CollectionDeleteResponse)(nil),                 // 21: master_pb.CollectionDeleteResponse
-	(*DataNodeInfo)(nil),                             // 22: master_pb.DataNodeInfo
-	(*RackInfo)(nil),                                 // 23: master_pb.RackInfo
-	(*DataCenterInfo)(nil),                           // 24: master_pb.DataCenterInfo
-	(*TopologyInfo)(nil),                             // 25: master_pb.TopologyInfo
-	(*VolumeListRequest)(nil),                        // 26: master_pb.VolumeListRequest
-	(*VolumeListResponse)(nil),                       // 27: master_pb.VolumeListResponse
-	(*LookupEcVolumeRequest)(nil),                    // 28: master_pb.LookupEcVolumeRequest
-	(*LookupEcVolumeResponse)(nil),                   // 29: master_pb.LookupEcVolumeResponse
-	(*VacuumVolumeRequest)(nil),                      // 30: master_pb.VacuumVolumeRequest
-	(*VacuumVolumeResponse)(nil),                     // 31: master_pb.VacuumVolumeResponse
-	(*GetMasterConfigurationRequest)(nil),            // 32: master_pb.GetMasterConfigurationRequest
-	(*GetMasterConfigurationResponse)(nil),           // 33: master_pb.GetMasterConfigurationResponse
-	(*ListMasterClientsRequest)(nil),                 // 34: master_pb.ListMasterClientsRequest
-	(*ListMasterClientsResponse)(nil),                // 35: master_pb.ListMasterClientsResponse
-	(*LeaseAdminTokenRequest)(nil),                   // 36: master_pb.LeaseAdminTokenRequest
-	(*LeaseAdminTokenResponse)(nil),                  // 37: master_pb.LeaseAdminTokenResponse
-	(*ReleaseAdminTokenRequest)(nil),                 // 38: master_pb.ReleaseAdminTokenRequest
-	(*ReleaseAdminTokenResponse)(nil),                // 39: master_pb.ReleaseAdminTokenResponse
-	nil,                                              // 40: master_pb.StorageBackend.PropertiesEntry
-	(*SuperBlockExtra_ErasureCoding)(nil),            // 41: master_pb.SuperBlockExtra.ErasureCoding
-	(*LookupVolumeResponse_VolumeIdLocation)(nil),    // 42: master_pb.LookupVolumeResponse.VolumeIdLocation
-	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 43: master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	(*Heartbeat)(nil),                             // 0: master_pb.Heartbeat
+	(*HeartbeatResponse)(nil),                     // 1: master_pb.HeartbeatResponse
+	(*VolumeInformationMessage)(nil),              // 2: master_pb.VolumeInformationMessage
+	(*VolumeShortInformationMessage)(nil),         // 3: master_pb.VolumeShortInformationMessage
+	(*VolumeEcShardInformationMessage)(nil),       // 4: master_pb.VolumeEcShardInformationMessage
+	(*StorageBackend)(nil),                        // 5: master_pb.StorageBackend
+	(*Empty)(nil),                                 // 6: master_pb.Empty
+	(*SuperBlockExtra)(nil),                       // 7: master_pb.SuperBlockExtra
+	(*KeepConnectedRequest)(nil),                  // 8: master_pb.KeepConnectedRequest
+	(*VolumeLocation)(nil),                        // 9: master_pb.VolumeLocation
+	(*LookupVolumeRequest)(nil),                   // 10: master_pb.LookupVolumeRequest
+	(*LookupVolumeResponse)(nil),                  // 11: master_pb.LookupVolumeResponse
+	(*Location)(nil),                              // 12: master_pb.Location
+	(*AssignRequest)(nil),                         // 13: master_pb.AssignRequest
+	(*AssignResponse)(nil),                        // 14: master_pb.AssignResponse
+	(*StatisticsRequest)(nil),                     // 15: master_pb.StatisticsRequest
+	(*StatisticsResponse)(nil),                    // 16: master_pb.StatisticsResponse
+	(*Collection)(nil),                            // 17: master_pb.Collection
+	(*CollectionListRequest)(nil),                 // 18: master_pb.CollectionListRequest
+	(*CollectionListResponse)(nil),                // 19: master_pb.CollectionListResponse
+	(*CollectionDeleteRequest)(nil),               // 20: master_pb.CollectionDeleteRequest
+	(*CollectionDeleteResponse)(nil),              // 21: master_pb.CollectionDeleteResponse
+	(*DiskInfo)(nil),                              // 22: master_pb.DiskInfo
+	(*DataNodeInfo)(nil),                          // 23: master_pb.DataNodeInfo
+	(*RackInfo)(nil),                              // 24: master_pb.RackInfo
+	(*DataCenterInfo)(nil),                        // 25: master_pb.DataCenterInfo
+	(*TopologyInfo)(nil),                          // 26: master_pb.TopologyInfo
+	(*VolumeListRequest)(nil),                     // 27: master_pb.VolumeListRequest
+	(*VolumeListResponse)(nil),                    // 28: master_pb.VolumeListResponse
+	(*LookupEcVolumeRequest)(nil),                 // 29: master_pb.LookupEcVolumeRequest
+	(*LookupEcVolumeResponse)(nil),                // 30: master_pb.LookupEcVolumeResponse
+	(*VacuumVolumeRequest)(nil),                   // 31: master_pb.VacuumVolumeRequest
+	(*VacuumVolumeResponse)(nil),                  // 32: master_pb.VacuumVolumeResponse
+	(*GetMasterConfigurationRequest)(nil),         // 33: master_pb.GetMasterConfigurationRequest
+	(*GetMasterConfigurationResponse)(nil),        // 34: master_pb.GetMasterConfigurationResponse
+	(*ListMasterClientsRequest)(nil),              // 35: master_pb.ListMasterClientsRequest
+	(*ListMasterClientsResponse)(nil),             // 36: master_pb.ListMasterClientsResponse
+	(*LeaseAdminTokenRequest)(nil),                // 37: master_pb.LeaseAdminTokenRequest
+	(*LeaseAdminTokenResponse)(nil),               // 38: master_pb.LeaseAdminTokenResponse
+	(*ReleaseAdminTokenRequest)(nil),              // 39: master_pb.ReleaseAdminTokenRequest
+	(*ReleaseAdminTokenResponse)(nil),             // 40: master_pb.ReleaseAdminTokenResponse
+	nil,                                           // 41: master_pb.Heartbeat.MaxVolumeCountsEntry
+	nil,                                           // 42: master_pb.StorageBackend.PropertiesEntry
+	(*SuperBlockExtra_ErasureCoding)(nil),         // 43: master_pb.SuperBlockExtra.ErasureCoding
+	(*LookupVolumeResponse_VolumeIdLocation)(nil), // 44: master_pb.LookupVolumeResponse.VolumeIdLocation
+	nil, // 45: master_pb.DataNodeInfo.DiskInfosEntry
+	nil, // 46: master_pb.RackInfo.DiskInfosEntry
+	nil, // 47: master_pb.DataCenterInfo.DiskInfosEntry
+	nil, // 48: master_pb.TopologyInfo.DiskInfosEntry
+	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 49: master_pb.LookupEcVolumeResponse.EcShardIdLocation
 }
 var file_master_proto_depIdxs = []int32{
 	2,  // 0: master_pb.Heartbeat.volumes:type_name -> master_pb.VolumeInformationMessage
@@ -3565,54 +3448,63 @@ var file_master_proto_depIdxs = []int32{
 	4,  // 3: master_pb.Heartbeat.ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
 	4,  // 4: master_pb.Heartbeat.new_ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
 	4,  // 5: master_pb.Heartbeat.deleted_ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
-	5,  // 6: master_pb.HeartbeatResponse.storage_backends:type_name -> master_pb.StorageBackend
-	40, // 7: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
-	41, // 8: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
-	42, // 9: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
-	17, // 10: master_pb.CollectionListResponse.collections:type_name -> master_pb.Collection
-	2,  // 11: master_pb.DataNodeInfo.volume_infos:type_name -> master_pb.VolumeInformationMessage
-	4,  // 12: master_pb.DataNodeInfo.ec_shard_infos:type_name -> master_pb.VolumeEcShardInformationMessage
-	22, // 13: master_pb.RackInfo.data_node_infos:type_name -> master_pb.DataNodeInfo
-	23, // 14: master_pb.DataCenterInfo.rack_infos:type_name -> master_pb.RackInfo
-	24, // 15: master_pb.TopologyInfo.data_center_infos:type_name -> master_pb.DataCenterInfo
-	25, // 16: master_pb.VolumeListResponse.topology_info:type_name -> master_pb.TopologyInfo
-	43, // 17: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
-	5,  // 18: master_pb.GetMasterConfigurationResponse.storage_backends:type_name -> master_pb.StorageBackend
-	12, // 19: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
-	12, // 20: master_pb.LookupEcVolumeResponse.EcShardIdLocation.locations:type_name -> master_pb.Location
-	0,  // 21: master_pb.Seaweed.SendHeartbeat:input_type -> master_pb.Heartbeat
-	8,  // 22: master_pb.Seaweed.KeepConnected:input_type -> master_pb.KeepConnectedRequest
-	10, // 23: master_pb.Seaweed.LookupVolume:input_type -> master_pb.LookupVolumeRequest
-	13, // 24: master_pb.Seaweed.Assign:input_type -> master_pb.AssignRequest
-	15, // 25: master_pb.Seaweed.Statistics:input_type -> master_pb.StatisticsRequest
-	18, // 26: master_pb.Seaweed.CollectionList:input_type -> master_pb.CollectionListRequest
-	20, // 27: master_pb.Seaweed.CollectionDelete:input_type -> master_pb.CollectionDeleteRequest
-	26, // 28: master_pb.Seaweed.VolumeList:input_type -> master_pb.VolumeListRequest
-	28, // 29: master_pb.Seaweed.LookupEcVolume:input_type -> master_pb.LookupEcVolumeRequest
-	30, // 30: master_pb.Seaweed.VacuumVolume:input_type -> master_pb.VacuumVolumeRequest
-	32, // 31: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
-	34, // 32: master_pb.Seaweed.ListMasterClients:input_type -> master_pb.ListMasterClientsRequest
-	36, // 33: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
-	38, // 34: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
-	1,  // 35: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
-	9,  // 36: master_pb.Seaweed.KeepConnected:output_type -> master_pb.VolumeLocation
-	11, // 37: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
-	14, // 38: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
-	16, // 39: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
-	19, // 40: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
-	21, // 41: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
-	27, // 42: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
-	29, // 43: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
-	31, // 44: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
-	33, // 45: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
-	35, // 46: master_pb.Seaweed.ListMasterClients:output_type -> master_pb.ListMasterClientsResponse
-	37, // 47: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
-	39, // 48: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
-	35, // [35:49] is the sub-list for method output_type
-	21, // [21:35] is the sub-list for method input_type
-	21, // [21:21] is the sub-list for extension type_name
-	21, // [21:21] is the sub-list for extension extendee
-	0,  // [0:21] is the sub-list for field type_name
+	41, // 6: master_pb.Heartbeat.max_volume_counts:type_name -> master_pb.Heartbeat.MaxVolumeCountsEntry
+	5,  // 7: master_pb.HeartbeatResponse.storage_backends:type_name -> master_pb.StorageBackend
+	42, // 8: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
+	43, // 9: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
+	44, // 10: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
+	17, // 11: master_pb.CollectionListResponse.collections:type_name -> master_pb.Collection
+	2,  // 12: master_pb.DiskInfo.volume_infos:type_name -> master_pb.VolumeInformationMessage
+	4,  // 13: master_pb.DiskInfo.ec_shard_infos:type_name -> master_pb.VolumeEcShardInformationMessage
+	45, // 14: master_pb.DataNodeInfo.diskInfos:type_name -> master_pb.DataNodeInfo.DiskInfosEntry
+	23, // 15: master_pb.RackInfo.data_node_infos:type_name -> master_pb.DataNodeInfo
+	46, // 16: master_pb.RackInfo.diskInfos:type_name -> master_pb.RackInfo.DiskInfosEntry
+	24, // 17: master_pb.DataCenterInfo.rack_infos:type_name -> master_pb.RackInfo
+	47, // 18: master_pb.DataCenterInfo.diskInfos:type_name -> master_pb.DataCenterInfo.DiskInfosEntry
+	25, // 19: master_pb.TopologyInfo.data_center_infos:type_name -> master_pb.DataCenterInfo
+	48, // 20: master_pb.TopologyInfo.diskInfos:type_name -> master_pb.TopologyInfo.DiskInfosEntry
+	26, // 21: master_pb.VolumeListResponse.topology_info:type_name -> master_pb.TopologyInfo
+	49, // 22: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	5,  // 23: master_pb.GetMasterConfigurationResponse.storage_backends:type_name -> master_pb.StorageBackend
+	12, // 24: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
+	22, // 25: master_pb.DataNodeInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	22, // 26: master_pb.RackInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	22, // 27: master_pb.DataCenterInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	22, // 28: master_pb.TopologyInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	12, // 29: master_pb.LookupEcVolumeResponse.EcShardIdLocation.locations:type_name -> master_pb.Location
+	0,  // 30: master_pb.Seaweed.SendHeartbeat:input_type -> master_pb.Heartbeat
+	8,  // 31: master_pb.Seaweed.KeepConnected:input_type -> master_pb.KeepConnectedRequest
+	10, // 32: master_pb.Seaweed.LookupVolume:input_type -> master_pb.LookupVolumeRequest
+	13, // 33: master_pb.Seaweed.Assign:input_type -> master_pb.AssignRequest
+	15, // 34: master_pb.Seaweed.Statistics:input_type -> master_pb.StatisticsRequest
+	18, // 35: master_pb.Seaweed.CollectionList:input_type -> master_pb.CollectionListRequest
+	20, // 36: master_pb.Seaweed.CollectionDelete:input_type -> master_pb.CollectionDeleteRequest
+	27, // 37: master_pb.Seaweed.VolumeList:input_type -> master_pb.VolumeListRequest
+	29, // 38: master_pb.Seaweed.LookupEcVolume:input_type -> master_pb.LookupEcVolumeRequest
+	31, // 39: master_pb.Seaweed.VacuumVolume:input_type -> master_pb.VacuumVolumeRequest
+	33, // 40: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
+	35, // 41: master_pb.Seaweed.ListMasterClients:input_type -> master_pb.ListMasterClientsRequest
+	37, // 42: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
+	39, // 43: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
+	1,  // 44: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
+	9,  // 45: master_pb.Seaweed.KeepConnected:output_type -> master_pb.VolumeLocation
+	11, // 46: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
+	14, // 47: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
+	16, // 48: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
+	19, // 49: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
+	21, // 50: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
+	28, // 51: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
+	30, // 52: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
+	32, // 53: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
+	34, // 54: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
+	36, // 55: master_pb.Seaweed.ListMasterClients:output_type -> master_pb.ListMasterClientsResponse
+	38, // 56: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
+	40, // 57: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
+	44, // [44:58] is the sub-list for method output_type
+	30, // [30:44] is the sub-list for method input_type
+	30, // [30:30] is the sub-list for extension type_name
+	30, // [30:30] is the sub-list for extension extendee
+	0,  // [0:30] is the sub-list for field type_name
 }
 
 func init() { file_master_proto_init() }
@@ -3886,7 +3778,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[22].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DataNodeInfo); i {
+			switch v := v.(*DiskInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3898,7 +3790,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[23].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RackInfo); i {
+			switch v := v.(*DataNodeInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3910,7 +3802,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DataCenterInfo); i {
+			switch v := v.(*RackInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3922,7 +3814,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TopologyInfo); i {
+			switch v := v.(*DataCenterInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3934,7 +3826,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*VolumeListRequest); i {
+			switch v := v.(*TopologyInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3946,7 +3838,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[27].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*VolumeListResponse); i {
+			switch v := v.(*VolumeListRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3958,7 +3850,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[28].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LookupEcVolumeRequest); i {
+			switch v := v.(*VolumeListResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3970,7 +3862,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[29].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LookupEcVolumeResponse); i {
+			switch v := v.(*LookupEcVolumeRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3982,7 +3874,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*VacuumVolumeRequest); i {
+			switch v := v.(*LookupEcVolumeResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3994,7 +3886,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*VacuumVolumeResponse); i {
+			switch v := v.(*VacuumVolumeRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4006,7 +3898,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetMasterConfigurationRequest); i {
+			switch v := v.(*VacuumVolumeResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4018,7 +3910,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetMasterConfigurationResponse); i {
+			switch v := v.(*GetMasterConfigurationRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4030,7 +3922,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListMasterClientsRequest); i {
+			switch v := v.(*GetMasterConfigurationResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4042,7 +3934,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[35].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListMasterClientsResponse); i {
+			switch v := v.(*ListMasterClientsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4054,7 +3946,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[36].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LeaseAdminTokenRequest); i {
+			switch v := v.(*ListMasterClientsResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4066,7 +3958,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LeaseAdminTokenResponse); i {
+			switch v := v.(*LeaseAdminTokenRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4078,7 +3970,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ReleaseAdminTokenRequest); i {
+			switch v := v.(*LeaseAdminTokenResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4090,6 +3982,18 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ReleaseAdminTokenRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ReleaseAdminTokenResponse); i {
 			case 0:
 				return &v.state
@@ -4101,7 +4005,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SuperBlockExtra_ErasureCoding); i {
 			case 0:
 				return &v.state
@@ -4113,7 +4017,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[44].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupVolumeResponse_VolumeIdLocation); i {
 			case 0:
 				return &v.state
@@ -4125,7 +4029,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[49].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupEcVolumeResponse_EcShardIdLocation); i {
 			case 0:
 				return &v.state
@@ -4144,7 +4048,7 @@ func file_master_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_master_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   44,
+			NumMessages:   50,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index 62b8cdf07..0f0b7f101 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -67,7 +67,7 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			dcName, rackName := ms.Topo.Configuration.Locate(heartbeat.Ip, heartbeat.DataCenter, heartbeat.Rack)
 			dc := ms.Topo.GetOrCreateDataCenter(dcName)
 			rack := dc.GetOrCreateRack(rackName)
-			dn = rack.GetOrCreateDataNode(heartbeat.Ip, int(heartbeat.Port), heartbeat.PublicUrl, int64(heartbeat.MaxVolumeCount), int64(heartbeat.MaxSsdVolumeCount))
+			dn = rack.GetOrCreateDataNode(heartbeat.Ip, int(heartbeat.Port), heartbeat.PublicUrl, heartbeat.MaxVolumeCounts)
 			glog.V(0).Infof("added volume server %v:%d", heartbeat.GetIp(), heartbeat.GetPort())
 			if err := stream.Send(&master_pb.HeartbeatResponse{
 				VolumeSizeLimit: uint64(ms.option.VolumeSizeLimitMB) * 1024 * 1024,
@@ -77,14 +77,7 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			}
 		}
 
-		if heartbeat.MaxVolumeCount != 0 && dn.GetMaxVolumeCount() != int64(heartbeat.MaxVolumeCount) {
-			delta := int64(heartbeat.MaxVolumeCount) - dn.GetMaxVolumeCount()
-			dn.UpAdjustMaxVolumeCountDelta(delta)
-		}
-		if heartbeat.MaxSsdVolumeCount != 0 && dn.GetMaxSsdVolumeCount() != int64(heartbeat.MaxSsdVolumeCount) {
-			delta := int64(heartbeat.MaxSsdVolumeCount) - dn.GetMaxSsdVolumeCount()
-			dn.UpAdjustMaxSsdVolumeCountDelta(delta)
-		}
+		dn.AdjustMaxVolumeCounts(heartbeat.MaxVolumeCounts)
 
 		glog.V(4).Infof("master received heartbeat %s", heartbeat.String())
 		message := &master_pb.VolumeLocation{
diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index deac3027c..1699eaa36 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 	"github.com/chrislusf/raft"
-	"github.com/chrislusf/seaweedfs/weed/storage"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/security"
@@ -61,7 +61,7 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest
 	if err != nil {
 		return nil, err
 	}
-	diskType := storage.ToDiskType(req.DiskType)
+	diskType := types.ToDiskType(req.DiskType)
 
 	option := &topology.VolumeGrowOption{
 		Collection:         req.Collection,
@@ -120,10 +120,10 @@ func (ms *MasterServer) Statistics(ctx context.Context, req *master_pb.Statistic
 		return nil, err
 	}
 
-	volumeLayout := ms.Topo.GetVolumeLayout(req.Collection, replicaPlacement, ttl, storage.DiskType(req.DiskType))
+	volumeLayout := ms.Topo.GetVolumeLayout(req.Collection, replicaPlacement, ttl, types.ToDiskType(req.DiskType))
 	stats := volumeLayout.Stats()
 
-	totalSize := (ms.Topo.GetMaxVolumeCount() + ms.Topo.GetMaxSsdVolumeCount()) * int64(ms.option.VolumeSizeLimitMB) * 1024 * 1024
+	totalSize := ms.Topo.GetDiskUsages().GetMaxVolumeCount() * int64(ms.option.VolumeSizeLimitMB) * 1024 * 1024
 
 	resp := &master_pb.StatisticsResponse{
 		TotalSize: uint64(totalSize),
diff --git a/weed/server/master_server_handlers_admin.go b/weed/server/master_server_handlers_admin.go
index 28737324c..e68dafc5a 100644
--- a/weed/server/master_server_handlers_admin.go
+++ b/weed/server/master_server_handlers_admin.go
@@ -3,7 +3,7 @@ package weed_server
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/storage"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"math/rand"
 	"net/http"
 	"strconv"
@@ -158,7 +158,7 @@ func (ms *MasterServer) getVolumeGrowOption(r *http.Request) (*topology.VolumeGr
 	if err != nil {
 		return nil, err
 	}
-	diskType := storage.ToDiskType(r.FormValue("disk"))
+	diskType := types.ToDiskType(r.FormValue("disk"))
 
 	preallocate := ms.preallocateSize
 	if r.FormValue("preallocate") != "" {
diff --git a/weed/server/volume_grpc_admin.go b/weed/server/volume_grpc_admin.go
index 55bb6573e..2bc108a23 100644
--- a/weed/server/volume_grpc_admin.go
+++ b/weed/server/volume_grpc_admin.go
@@ -3,7 +3,6 @@ package weed_server
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/storage"
 	"path/filepath"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -42,7 +41,7 @@ func (vs *VolumeServer) AllocateVolume(ctx context.Context, req *volume_server_p
 		req.Ttl,
 		req.Preallocate,
 		req.MemoryMapMaxSizeMb,
-		storage.DiskType(req.DiskType),
+		types.ToDiskType(req.DiskType),
 	)
 
 	if err != nil {
diff --git a/weed/server/volume_grpc_client_to_master.go b/weed/server/volume_grpc_client_to_master.go
index 2f594fa2b..323667d2e 100644
--- a/weed/server/volume_grpc_client_to_master.go
+++ b/weed/server/volume_grpc_client_to_master.go
@@ -222,7 +222,6 @@ func (vs *VolumeServer) doHeartbeat(masterNode, masterGrpcAddress string, grpcDi
 				Ip:             vs.store.Ip,
 				Port:           uint32(vs.store.Port),
 				PublicUrl:      vs.store.PublicUrl,
-				MaxVolumeCount: uint32(0),
 				MaxFileKey:     uint64(0),
 				DataCenter:     vs.store.GetDataCenter(),
 				Rack:           vs.store.GetRack(),
diff --git a/weed/server/volume_grpc_copy.go b/weed/server/volume_grpc_copy.go
index 8fe71bd2e..3b6524df8 100644
--- a/weed/server/volume_grpc_copy.go
+++ b/weed/server/volume_grpc_copy.go
@@ -3,6 +3,7 @@ package weed_server
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"io"
 	"io/ioutil"
 	"math"
@@ -58,7 +59,7 @@ func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.Vo
 		if req.DiskType != "" {
 			diskType = req.DiskType
 		}
-		location := vs.store.FindFreeLocation(storage.DiskType(diskType))
+		location := vs.store.FindFreeLocation(types.ToDiskType(diskType))
 		if location == nil {
 			return fmt.Errorf("no space left")
 		}
diff --git a/weed/server/volume_grpc_erasure_coding.go b/weed/server/volume_grpc_erasure_coding.go
index e13afdf55..452c2766e 100644
--- a/weed/server/volume_grpc_erasure_coding.go
+++ b/weed/server/volume_grpc_erasure_coding.go
@@ -105,7 +105,7 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 
 	glog.V(0).Infof("VolumeEcShardsCopy: %v", req)
 
-	location := vs.store.FindFreeLocation(storage.HardDriveType)
+	location := vs.store.FindFreeLocation(types.HardDriveType)
 	if location == nil {
 		return nil, fmt.Errorf("no space left")
 	}
diff --git a/weed/server/volume_server.go b/weed/server/volume_server.go
index 4cdb1628b..e496b1ce2 100644
--- a/weed/server/volume_server.go
+++ b/weed/server/volume_server.go
@@ -2,6 +2,7 @@ package weed_server
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"net/http"
 
 	"google.golang.org/grpc"
@@ -37,7 +38,7 @@ type VolumeServer struct {
 
 func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 	port int, publicUrl string,
-	folders []string, maxCounts []int, minFreeSpacePercents []float32, diskTypes []storage.DiskType,
+	folders []string, maxCounts []int, minFreeSpacePercents []float32, diskTypes []types.DiskType,
 	idxFolder string,
 	needleMapKind storage.NeedleMapKind,
 	masterNodes []string, pulseSeconds int,
diff --git a/weed/shell/command_ec_balance.go b/weed/shell/command_ec_balance.go
index 7117f52df..b1ca926d5 100644
--- a/weed/shell/command_ec_balance.go
+++ b/weed/shell/command_ec_balance.go
@@ -3,6 +3,7 @@ package shell
 import (
 	"flag"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"io"
 	"sort"
 
@@ -325,7 +326,9 @@ func balanceEcShardsWithinRacks(commandEnv *CommandEnv, allEcNodes []*EcNode, ra
 
 			var possibleDestinationEcNodes []*EcNode
 			for _, n := range racks[RackId(rackId)].ecNodes {
-				possibleDestinationEcNodes = append(possibleDestinationEcNodes, n)
+				if _, found := n.info.DiskInfos[string(types.HardDriveType)]; found {
+					possibleDestinationEcNodes = append(possibleDestinationEcNodes, n)
+				}
 			}
 			sourceEcNodes := rackEcNodesWithVid[rackId]
 			averageShardsPerEcNode := ceilDivide(rackToShardCount[rackId], len(possibleDestinationEcNodes))
@@ -386,11 +389,15 @@ func doBalanceEcRack(commandEnv *CommandEnv, ecRack *EcRack, applyBalancing bool
 		rackEcNodes = append(rackEcNodes, node)
 	}
 
-	ecNodeIdToShardCount := groupByCount(rackEcNodes, func(node *EcNode) (id string, count int) {
-		for _, ecShardInfo := range node.info.EcShardInfos {
+	ecNodeIdToShardCount := groupByCount(rackEcNodes, func(ecNode *EcNode) (id string, count int) {
+		diskInfo, found := ecNode.info.DiskInfos[string(types.HardDriveType)]
+		if !found {
+			return
+		}
+		for _, ecShardInfo := range diskInfo.EcShardInfos {
 			count += erasure_coding.ShardBits(ecShardInfo.EcIndexBits).ShardIdCount()
 		}
-		return node.info.Id, count
+		return ecNode.info.Id, count
 	})
 
 	var totalShardCount int
@@ -411,26 +418,30 @@ func doBalanceEcRack(commandEnv *CommandEnv, ecRack *EcRack, applyBalancing bool
 		if fullNodeShardCount > averageShardCount && emptyNodeShardCount+1 <= averageShardCount {
 
 			emptyNodeIds := make(map[uint32]bool)
-			for _, shards := range emptyNode.info.EcShardInfos {
-				emptyNodeIds[shards.Id] = true
+			if emptyDiskInfo, found := emptyNode.info.DiskInfos[string(types.HardDriveType)]; found {
+				for _, shards := range emptyDiskInfo.EcShardInfos {
+					emptyNodeIds[shards.Id] = true
+				}
 			}
-			for _, shards := range fullNode.info.EcShardInfos {
-				if _, found := emptyNodeIds[shards.Id]; !found {
-					for _, shardId := range erasure_coding.ShardBits(shards.EcIndexBits).ShardIds() {
-
-						fmt.Printf("%s moves ec shards %d.%d to %s\n", fullNode.info.Id, shards.Id, shardId, emptyNode.info.Id)
-
-						err := moveMountedShardToEcNode(commandEnv, fullNode, shards.Collection, needle.VolumeId(shards.Id), shardId, emptyNode, applyBalancing)
-						if err != nil {
-							return err
+			if fullDiskInfo, found := fullNode.info.DiskInfos[string(types.HardDriveType)]; found {
+				for _, shards := range fullDiskInfo.EcShardInfos {
+					if _, found := emptyNodeIds[shards.Id]; !found {
+						for _, shardId := range erasure_coding.ShardBits(shards.EcIndexBits).ShardIds() {
+
+							fmt.Printf("%s moves ec shards %d.%d to %s\n", fullNode.info.Id, shards.Id, shardId, emptyNode.info.Id)
+
+							err := moveMountedShardToEcNode(commandEnv, fullNode, shards.Collection, needle.VolumeId(shards.Id), shardId, emptyNode, applyBalancing)
+							if err != nil {
+								return err
+							}
+
+							ecNodeIdToShardCount[emptyNode.info.Id]++
+							ecNodeIdToShardCount[fullNode.info.Id]--
+							hasMove = true
+							break
 						}
-
-						ecNodeIdToShardCount[emptyNode.info.Id]++
-						ecNodeIdToShardCount[fullNode.info.Id]--
-						hasMove = true
 						break
 					}
-					break
 				}
 			}
 		}
@@ -511,7 +522,11 @@ func pickNEcShardsToMoveFrom(ecNodes []*EcNode, vid needle.VolumeId, n int) map[
 func collectVolumeIdToEcNodes(allEcNodes []*EcNode) map[needle.VolumeId][]*EcNode {
 	vidLocations := make(map[needle.VolumeId][]*EcNode)
 	for _, ecNode := range allEcNodes {
-		for _, shardInfo := range ecNode.info.EcShardInfos {
+		diskInfo, found := ecNode.info.DiskInfos[string(types.HardDriveType)]
+		if !found {
+			continue
+		}
+		for _, shardInfo := range diskInfo.EcShardInfos {
 			vidLocations[needle.VolumeId(shardInfo.Id)] = append(vidLocations[needle.VolumeId(shardInfo.Id)], ecNode)
 		}
 	}
diff --git a/weed/shell/command_ec_common.go b/weed/shell/command_ec_common.go
index a808335eb..87a138ab6 100644
--- a/weed/shell/command_ec_common.go
+++ b/weed/shell/command_ec_common.go
@@ -3,6 +3,7 @@ package shell
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"math"
 	"sort"
 
@@ -159,8 +160,15 @@ func countShards(ecShardInfos []*master_pb.VolumeEcShardInformationMessage) (cou
 	return
 }
 
-func countFreeShardSlots(dn *master_pb.DataNodeInfo) (count int) {
-	return int(dn.MaxVolumeCount-dn.ActiveVolumeCount)*erasure_coding.DataShardsCount - countShards(dn.EcShardInfos)
+func countFreeShardSlots(dn *master_pb.DataNodeInfo, diskType types.DiskType) (count int) {
+	if dn.DiskInfos == nil {
+		return 0
+	}
+	diskInfo := dn.DiskInfos[string(diskType)]
+	if diskInfo == nil {
+		return 0
+	}
+	return int(diskInfo.MaxVolumeCount-diskInfo.ActiveVolumeCount)*erasure_coding.DataShardsCount - countShards(diskInfo.EcShardInfos)
 }
 
 type RackId string
@@ -174,10 +182,12 @@ type EcNode struct {
 }
 
 func (ecNode *EcNode) localShardIdCount(vid uint32) int {
-	for _, ecShardInfo := range ecNode.info.EcShardInfos {
-		if vid == ecShardInfo.Id {
-			shardBits := erasure_coding.ShardBits(ecShardInfo.EcIndexBits)
-			return shardBits.ShardIdCount()
+	for _, diskInfo := range ecNode.info.DiskInfos {
+		for _, ecShardInfo := range diskInfo.EcShardInfos {
+			if vid == ecShardInfo.Id {
+				shardBits := erasure_coding.ShardBits(ecShardInfo.EcIndexBits)
+				return shardBits.ShardIdCount()
+			}
 		}
 	}
 	return 0
@@ -214,7 +224,7 @@ func collectEcVolumeServersByDc(topo *master_pb.TopologyInfo, selectedDataCenter
 			return
 		}
 
-		freeEcSlots := countFreeShardSlots(dn)
+		freeEcSlots := countFreeShardSlots(dn, types.HardDriveType)
 		ecNodes = append(ecNodes, &EcNode{
 			info:       dn,
 			dc:         dc,
@@ -278,9 +288,11 @@ func ceilDivide(total, n int) int {
 
 func findEcVolumeShards(ecNode *EcNode, vid needle.VolumeId) erasure_coding.ShardBits {
 
-	for _, shardInfo := range ecNode.info.EcShardInfos {
-		if needle.VolumeId(shardInfo.Id) == vid {
-			return erasure_coding.ShardBits(shardInfo.EcIndexBits)
+	if diskInfo, found := ecNode.info.DiskInfos[string(types.HardDriveType)]; found {
+		for _, shardInfo := range diskInfo.EcShardInfos {
+			if needle.VolumeId(shardInfo.Id) == vid {
+				return erasure_coding.ShardBits(shardInfo.EcIndexBits)
+			}
 		}
 	}
 
@@ -290,18 +302,26 @@ func findEcVolumeShards(ecNode *EcNode, vid needle.VolumeId) erasure_coding.Shar
 func (ecNode *EcNode) addEcVolumeShards(vid needle.VolumeId, collection string, shardIds []uint32) *EcNode {
 
 	foundVolume := false
-	for _, shardInfo := range ecNode.info.EcShardInfos {
-		if needle.VolumeId(shardInfo.Id) == vid {
-			oldShardBits := erasure_coding.ShardBits(shardInfo.EcIndexBits)
-			newShardBits := oldShardBits
-			for _, shardId := range shardIds {
-				newShardBits = newShardBits.AddShardId(erasure_coding.ShardId(shardId))
+	diskInfo, found := ecNode.info.DiskInfos[string(types.HardDriveType)]
+	if found {
+		for _, shardInfo := range diskInfo.EcShardInfos {
+			if needle.VolumeId(shardInfo.Id) == vid {
+				oldShardBits := erasure_coding.ShardBits(shardInfo.EcIndexBits)
+				newShardBits := oldShardBits
+				for _, shardId := range shardIds {
+					newShardBits = newShardBits.AddShardId(erasure_coding.ShardId(shardId))
+				}
+				shardInfo.EcIndexBits = uint32(newShardBits)
+				ecNode.freeEcSlot -= newShardBits.ShardIdCount() - oldShardBits.ShardIdCount()
+				foundVolume = true
+				break
 			}
-			shardInfo.EcIndexBits = uint32(newShardBits)
-			ecNode.freeEcSlot -= newShardBits.ShardIdCount() - oldShardBits.ShardIdCount()
-			foundVolume = true
-			break
 		}
+	} else {
+		diskInfo = &master_pb.DiskInfo{
+			Type: string(types.HardDriveType),
+		}
+		ecNode.info.DiskInfos[string(types.HardDriveType)] = diskInfo
 	}
 
 	if !foundVolume {
@@ -309,10 +329,11 @@ func (ecNode *EcNode) addEcVolumeShards(vid needle.VolumeId, collection string,
 		for _, shardId := range shardIds {
 			newShardBits = newShardBits.AddShardId(erasure_coding.ShardId(shardId))
 		}
-		ecNode.info.EcShardInfos = append(ecNode.info.EcShardInfos, &master_pb.VolumeEcShardInformationMessage{
+		diskInfo.EcShardInfos = append(diskInfo.EcShardInfos, &master_pb.VolumeEcShardInformationMessage{
 			Id:          uint32(vid),
 			Collection:  collection,
 			EcIndexBits: uint32(newShardBits),
+			DiskType:    string(types.HardDriveType),
 		})
 		ecNode.freeEcSlot -= len(shardIds)
 	}
@@ -322,15 +343,17 @@ func (ecNode *EcNode) addEcVolumeShards(vid needle.VolumeId, collection string,
 
 func (ecNode *EcNode) deleteEcVolumeShards(vid needle.VolumeId, shardIds []uint32) *EcNode {
 
-	for _, shardInfo := range ecNode.info.EcShardInfos {
-		if needle.VolumeId(shardInfo.Id) == vid {
-			oldShardBits := erasure_coding.ShardBits(shardInfo.EcIndexBits)
-			newShardBits := oldShardBits
-			for _, shardId := range shardIds {
-				newShardBits = newShardBits.RemoveShardId(erasure_coding.ShardId(shardId))
+	if diskInfo, found := ecNode.info.DiskInfos[string(types.HardDriveType)]; found {
+		for _, shardInfo := range diskInfo.EcShardInfos {
+			if needle.VolumeId(shardInfo.Id) == vid {
+				oldShardBits := erasure_coding.ShardBits(shardInfo.EcIndexBits)
+				newShardBits := oldShardBits
+				for _, shardId := range shardIds {
+					newShardBits = newShardBits.RemoveShardId(erasure_coding.ShardId(shardId))
+				}
+				shardInfo.EcIndexBits = uint32(newShardBits)
+				ecNode.freeEcSlot -= newShardBits.ShardIdCount() - oldShardBits.ShardIdCount()
 			}
-			shardInfo.EcIndexBits = uint32(newShardBits)
-			ecNode.freeEcSlot -= newShardBits.ShardIdCount() - oldShardBits.ShardIdCount()
 		}
 	}
 
diff --git a/weed/shell/command_ec_decode.go b/weed/shell/command_ec_decode.go
index da7c8844f..3e1499d41 100644
--- a/weed/shell/command_ec_decode.go
+++ b/weed/shell/command_ec_decode.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"io"
 
 	"google.golang.org/grpc"
@@ -225,9 +226,11 @@ func collectTopologyInfo(commandEnv *CommandEnv) (topoInfo *master_pb.TopologyIn
 func collectEcShardInfos(topoInfo *master_pb.TopologyInfo, selectedCollection string, vid needle.VolumeId) (ecShardInfos []*master_pb.VolumeEcShardInformationMessage) {
 
 	eachDataNode(topoInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
-		for _, v := range dn.EcShardInfos {
-			if v.Collection == selectedCollection && v.Id == uint32(vid) {
-				ecShardInfos = append(ecShardInfos, v)
+		if diskInfo, found := dn.DiskInfos[string(types.HardDriveType)]; found {
+			for _, v := range diskInfo.EcShardInfos {
+				if v.Collection == selectedCollection && v.Id == uint32(vid) {
+					ecShardInfos = append(ecShardInfos, v)
+				}
 			}
 		}
 	})
@@ -239,9 +242,11 @@ func collectEcShardIds(topoInfo *master_pb.TopologyInfo, selectedCollection stri
 
 	vidMap := make(map[uint32]bool)
 	eachDataNode(topoInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
-		for _, v := range dn.EcShardInfos {
-			if v.Collection == selectedCollection {
-				vidMap[v.Id] = true
+		if diskInfo, found := dn.DiskInfos[string(types.HardDriveType)]; found {
+			for _, v := range diskInfo.EcShardInfos {
+				if v.Collection == selectedCollection {
+					vidMap[v.Id] = true
+				}
 			}
 		}
 	})
@@ -257,9 +262,11 @@ func collectEcNodeShardBits(topoInfo *master_pb.TopologyInfo, vid needle.VolumeI
 
 	nodeToEcIndexBits := make(map[string]erasure_coding.ShardBits)
 	eachDataNode(topoInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
-		for _, v := range dn.EcShardInfos {
-			if v.Id == uint32(vid) {
-				nodeToEcIndexBits[dn.Id] = erasure_coding.ShardBits(v.EcIndexBits)
+		if diskInfo, found := dn.DiskInfos[string(types.HardDriveType)]; found {
+			for _, v := range diskInfo.EcShardInfos {
+				if v.Id == uint32(vid) {
+					nodeToEcIndexBits[dn.Id] = erasure_coding.ShardBits(v.EcIndexBits)
+				}
 			}
 		}
 	})
diff --git a/weed/shell/command_ec_encode.go b/weed/shell/command_ec_encode.go
index b048b4cd3..e937f4490 100644
--- a/weed/shell/command_ec_encode.go
+++ b/weed/shell/command_ec_encode.go
@@ -281,10 +281,12 @@ func collectVolumeIdsForEcEncode(commandEnv *CommandEnv, selectedCollection stri
 
 	vidMap := make(map[uint32]bool)
 	eachDataNode(resp.TopologyInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
-		for _, v := range dn.VolumeInfos {
-			if v.Collection == selectedCollection && v.ModifiedAtSecond+quietSeconds < nowUnixSeconds {
-				if float64(v.Size) > fullPercentage/100*float64(resp.VolumeSizeLimitMb)*1024*1024 {
-					vidMap[v.Id] = true
+		for _, diskInfo := range dn.DiskInfos {
+			for _, v := range diskInfo.VolumeInfos {
+				if v.Collection == selectedCollection && v.ModifiedAtSecond+quietSeconds < nowUnixSeconds {
+					if float64(v.Size) > fullPercentage/100*float64(resp.VolumeSizeLimitMb)*1024*1024 {
+						vidMap[v.Id] = true
+					}
 				}
 			}
 		}
diff --git a/weed/shell/command_ec_rebuild.go b/weed/shell/command_ec_rebuild.go
index df28681fe..8d5d7bb91 100644
--- a/weed/shell/command_ec_rebuild.go
+++ b/weed/shell/command_ec_rebuild.go
@@ -188,10 +188,12 @@ func prepareDataToRecover(commandEnv *CommandEnv, rebuilder *EcNode, collection
 
 	needEcxFile := true
 	var localShardBits erasure_coding.ShardBits
-	for _, ecShardInfo := range rebuilder.info.EcShardInfos {
-		if ecShardInfo.Collection == collection && needle.VolumeId(ecShardInfo.Id) == volumeId {
-			needEcxFile = false
-			localShardBits = erasure_coding.ShardBits(ecShardInfo.EcIndexBits)
+	for _, diskInfo := range rebuilder.info.DiskInfos {
+		for _, ecShardInfo := range diskInfo.EcShardInfos {
+			if ecShardInfo.Collection == collection && needle.VolumeId(ecShardInfo.Id) == volumeId {
+				needEcxFile = false
+				localShardBits = erasure_coding.ShardBits(ecShardInfo.EcIndexBits)
+			}
 		}
 	}
 
@@ -247,15 +249,17 @@ type EcShardMap map[needle.VolumeId]EcShardLocations
 type EcShardLocations [][]*EcNode
 
 func (ecShardMap EcShardMap) registerEcNode(ecNode *EcNode, collection string) {
-	for _, shardInfo := range ecNode.info.EcShardInfos {
-		if shardInfo.Collection == collection {
-			existing, found := ecShardMap[needle.VolumeId(shardInfo.Id)]
-			if !found {
-				existing = make([][]*EcNode, erasure_coding.TotalShardsCount)
-				ecShardMap[needle.VolumeId(shardInfo.Id)] = existing
-			}
-			for _, shardId := range erasure_coding.ShardBits(shardInfo.EcIndexBits).ShardIds() {
-				existing[shardId] = append(existing[shardId], ecNode)
+	for _, diskInfo := range ecNode.info.DiskInfos {
+		for _, shardInfo := range diskInfo.EcShardInfos {
+			if shardInfo.Collection == collection {
+				existing, found := ecShardMap[needle.VolumeId(shardInfo.Id)]
+				if !found {
+					existing = make([][]*EcNode, erasure_coding.TotalShardsCount)
+					ecShardMap[needle.VolumeId(shardInfo.Id)] = existing
+				}
+				for _, shardId := range erasure_coding.ShardBits(shardInfo.EcIndexBits).ShardIds() {
+					existing[shardId] = append(existing[shardId], ecNode)
+				}
 			}
 		}
 	}
diff --git a/weed/shell/command_ec_test.go b/weed/shell/command_ec_test.go
index 4fddcbea5..14235d565 100644
--- a/weed/shell/command_ec_test.go
+++ b/weed/shell/command_ec_test.go
@@ -127,6 +127,7 @@ func newEcNode(dc string, rack string, dataNodeId string, freeEcSlot int) *EcNod
 	return &EcNode{
 		info: &master_pb.DataNodeInfo{
 			Id: dataNodeId,
+			DiskInfos: make(map[string]*master_pb.DiskInfo),
 		},
 		dc:         dc,
 		rack:       RackId(rack),
diff --git a/weed/shell/command_volume_balance.go b/weed/shell/command_volume_balance.go
index 6dd248844..a1e3c1ab6 100644
--- a/weed/shell/command_volume_balance.go
+++ b/weed/shell/command_volume_balance.go
@@ -4,8 +4,8 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"io"
 	"os"
 	"sort"
@@ -111,7 +111,7 @@ func (c *commandVolumeBalance) Do(args []string, commandEnv *CommandEnv, writer
 	return nil
 }
 
-func balanceVolumeServers(commandEnv *CommandEnv, diskTypes []storage.DiskType, volumeReplicas map[uint32][]*VolumeReplica, nodes []*Node, volumeSizeLimit uint64, collection string, applyBalancing bool) error {
+func balanceVolumeServers(commandEnv *CommandEnv, diskTypes []types.DiskType, volumeReplicas map[uint32][]*VolumeReplica, nodes []*Node, volumeSizeLimit uint64, collection string, applyBalancing bool) error {
 
 	for _, diskType := range diskTypes {
 		if err := balanceVolumeServersByDiskType(commandEnv, diskType, volumeReplicas, nodes, volumeSizeLimit, collection, applyBalancing); err != nil {
@@ -122,7 +122,7 @@ func balanceVolumeServers(commandEnv *CommandEnv, diskTypes []storage.DiskType,
 
 }
 
-func balanceVolumeServersByDiskType(commandEnv *CommandEnv, diskType storage.DiskType, volumeReplicas map[uint32][]*VolumeReplica, nodes []*Node, volumeSizeLimit uint64, collection string, applyBalancing bool) error {
+func balanceVolumeServersByDiskType(commandEnv *CommandEnv, diskType types.DiskType, volumeReplicas map[uint32][]*VolumeReplica, nodes []*Node, volumeSizeLimit uint64, collection string, applyBalancing bool) error {
 
 	// balance writable volumes
 	for _, n := range nodes {
@@ -135,7 +135,7 @@ func balanceVolumeServersByDiskType(commandEnv *CommandEnv, diskType storage.Dis
 			return v.DiskType == string(diskType) && (!v.ReadOnly && v.Size < volumeSizeLimit)
 		})
 	}
-	if err := balanceSelectedVolume(commandEnv, volumeReplicas, nodes, capacityByMaxVolumeCount, sortWritableVolumes, applyBalancing); err != nil {
+	if err := balanceSelectedVolume(commandEnv, volumeReplicas, nodes, capacityByMaxVolumeCount(diskType), sortWritableVolumes, applyBalancing); err != nil {
 		return err
 	}
 
@@ -150,7 +150,7 @@ func balanceVolumeServersByDiskType(commandEnv *CommandEnv, diskType storage.Dis
 			return v.DiskType == string(diskType) && (v.ReadOnly || v.Size >= volumeSizeLimit)
 		})
 	}
-	if err := balanceSelectedVolume(commandEnv, volumeReplicas, nodes, capacityByMaxVolumeCount, sortReadOnlyVolumes, applyBalancing); err != nil {
+	if err := balanceSelectedVolume(commandEnv, volumeReplicas, nodes, capacityByMaxVolumeCount(diskType), sortReadOnlyVolumes, applyBalancing); err != nil {
 		return err
 	}
 
@@ -175,21 +175,21 @@ func collectVolumeServersByDc(t *master_pb.TopologyInfo, selectedDataCenter stri
 	return
 }
 
-func collectVolumeDiskTypes(t *master_pb.TopologyInfo) (diskTypes []storage.DiskType) {
+func collectVolumeDiskTypes(t *master_pb.TopologyInfo) (diskTypes []types.DiskType) {
 	knownTypes := make(map[string]bool)
 	for _, dc := range t.DataCenterInfos {
 		for _, r := range dc.RackInfos {
 			for _, dn := range r.DataNodeInfos {
-				for _, vi := range dn.VolumeInfos {
-					if _, found := knownTypes[vi.DiskType]; !found {
-						knownTypes[vi.DiskType] = true
+				for diskType, _ := range dn.DiskInfos {
+					if _, found := knownTypes[diskType]; !found {
+						knownTypes[diskType] = true
 					}
 				}
 			}
 		}
 	}
 	for diskType, _ := range knownTypes {
-		diskTypes = append(diskTypes, storage.ToDiskType(diskType))
+		diskTypes = append(diskTypes, types.ToDiskType(diskType))
 	}
 	return
 }
@@ -203,11 +203,24 @@ type Node struct {
 
 type CapacityFunc func(*master_pb.DataNodeInfo) int
 
-func capacityByMaxSsdVolumeCount(info *master_pb.DataNodeInfo) int {
-	return int(info.MaxSsdVolumeCount)
+func capacityByMaxVolumeCount(diskType types.DiskType) CapacityFunc {
+	return func(info *master_pb.DataNodeInfo) int {
+		diskInfo, found := info.DiskInfos[string(diskType)]
+		if !found {
+			return 0
+		}
+		return int(diskInfo.MaxVolumeCount)
+	}
 }
-func capacityByMaxVolumeCount(info *master_pb.DataNodeInfo) int {
-	return int(info.MaxVolumeCount)
+
+func capacityByFreeVolumeCount(diskType types.DiskType) CapacityFunc {
+	return func(info *master_pb.DataNodeInfo) int {
+		diskInfo, found := info.DiskInfos[string(diskType)]
+		if !found {
+			return 0
+		}
+		return int(diskInfo.MaxVolumeCount - diskInfo.VolumeCount)
+	}
 }
 
 func (n *Node) localVolumeRatio(capacityFunc CapacityFunc) float64 {
@@ -220,9 +233,11 @@ func (n *Node) localVolumeNextRatio(capacityFunc CapacityFunc) float64 {
 
 func (n *Node) selectVolumes(fn func(v *master_pb.VolumeInformationMessage) bool) {
 	n.selectedVolumes = make(map[uint32]*master_pb.VolumeInformationMessage)
-	for _, v := range n.info.VolumeInfos {
-		if fn(v) {
-			n.selectedVolumes[v.Id] = v
+	for _, diskInfo := range n.info.DiskInfos {
+		for _, v := range diskInfo.VolumeInfos {
+			if fn(v) {
+				n.selectedVolumes[v.Id] = v
+			}
 		}
 	}
 }
@@ -329,7 +344,7 @@ func moveVolume(commandEnv *CommandEnv, v *master_pb.VolumeInformationMessage, f
 	}
 	fmt.Fprintf(os.Stdout, "  moving %s volume %s%d %s => %s\n", v.DiskType, collectionPrefix, v.Id, fullNode.info.Id, emptyNode.info.Id)
 	if applyChange {
-		return LiveMoveVolume(commandEnv.option.GrpcDialOption, needle.VolumeId(v.Id), fullNode.info.Id, emptyNode.info.Id, 5*time.Second, "")
+		return LiveMoveVolume(commandEnv.option.GrpcDialOption, needle.VolumeId(v.Id), fullNode.info.Id, emptyNode.info.Id, 5*time.Second, v.DiskType)
 	}
 	return nil
 }
diff --git a/weed/shell/command_volume_configure_replication.go b/weed/shell/command_volume_configure_replication.go
index 539bdb515..ecbe402e8 100644
--- a/weed/shell/command_volume_configure_replication.go
+++ b/weed/shell/command_volume_configure_replication.go
@@ -71,10 +71,12 @@ func (c *commandVolumeConfigureReplication) Do(args []string, commandEnv *Comman
 	var allLocations []location
 	eachDataNode(resp.TopologyInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
 		loc := newLocation(dc, string(rack), dn)
-		for _, v := range dn.VolumeInfos {
-			if v.Id == uint32(vid) && v.ReplicaPlacement != replicaPlacementInt32 {
-				allLocations = append(allLocations, loc)
-				continue
+		for _, diskInfo := range dn.DiskInfos {
+			for _, v := range diskInfo.VolumeInfos {
+				if v.Id == uint32(vid) && v.ReplicaPlacement != replicaPlacementInt32 {
+					allLocations = append(allLocations, loc)
+					continue
+				}
 			}
 		}
 	})
diff --git a/weed/shell/command_volume_fix_replication.go b/weed/shell/command_volume_fix_replication.go
index 8ae8850f3..7b2eb6769 100644
--- a/weed/shell/command_volume_fix_replication.go
+++ b/weed/shell/command_volume_fix_replication.go
@@ -5,6 +5,7 @@ import (
 	"flag"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"io"
 	"path/filepath"
 	"sort"
@@ -102,8 +103,6 @@ func (c *commandVolumeFixReplication) Do(args []string, commandEnv *CommandEnv,
 	}
 
 	// find the most under populated data nodes
-	keepDataNodesSorted(allLocations)
-
 	return c.fixUnderReplicatedVolumes(commandEnv, writer, takeAction, underReplicatedVolumeIds, volumeReplicas, allLocations)
 
 }
@@ -113,11 +112,13 @@ func collectVolumeReplicaLocations(resp *master_pb.VolumeListResponse) (map[uint
 	var allLocations []location
 	eachDataNode(resp.TopologyInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
 		loc := newLocation(dc, string(rack), dn)
-		for _, v := range dn.VolumeInfos {
-			volumeReplicas[v.Id] = append(volumeReplicas[v.Id], &VolumeReplica{
-				location: &loc,
-				info:     v,
-			})
+		for _, diskInfo := range dn.DiskInfos {
+			for _, v := range diskInfo.VolumeInfos {
+				volumeReplicas[v.Id] = append(volumeReplicas[v.Id], &VolumeReplica{
+					location: &loc,
+					info:     v,
+				})
+			}
 		}
 		allLocations = append(allLocations, loc)
 	})
@@ -157,15 +158,18 @@ func (c *commandVolumeFixReplication) fixOverReplicatedVolumes(commandEnv *Comma
 }
 
 func (c *commandVolumeFixReplication) fixUnderReplicatedVolumes(commandEnv *CommandEnv, writer io.Writer, takeAction bool, underReplicatedVolumeIds []uint32, volumeReplicas map[uint32][]*VolumeReplica, allLocations []location) error {
+
 	for _, vid := range underReplicatedVolumeIds {
 		replicas := volumeReplicas[vid]
 		replica := pickOneReplicaToCopyFrom(replicas)
 		replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(replica.info.ReplicaPlacement))
 		foundNewLocation := false
 		hasSkippedCollection := false
+		keepDataNodesSorted(allLocations, replica.info.DiskType)
 		for _, dst := range allLocations {
 			// check whether data nodes satisfy the constraints
-			if dst.dataNode.FreeVolumeCount > 0 && satisfyReplicaPlacement(replicaPlacement, replicas, dst) {
+			fn := capacityByFreeVolumeCount(types.ToDiskType(replica.info.DiskType))
+			if fn(dst.dataNode) > 0 && satisfyReplicaPlacement(replicaPlacement, replicas, dst) {
 				// check collection name pattern
 				if *c.collectionPattern != "" {
 					matched, err := filepath.Match(*c.collectionPattern, replica.info.Collection)
@@ -202,11 +206,11 @@ func (c *commandVolumeFixReplication) fixUnderReplicatedVolumes(commandEnv *Comm
 				}
 
 				// adjust free volume count
-				dst.dataNode.FreeVolumeCount--
-				keepDataNodesSorted(allLocations)
+				dst.dataNode.DiskInfos[replica.info.DiskType].FreeVolumeCount--
 				break
 			}
 		}
+
 		if !foundNewLocation && !hasSkippedCollection {
 			fmt.Fprintf(writer, "failed to place volume %d replica as %s, existing:%+v\n", replica.info.Id, replicaPlacement, len(replicas))
 		}
@@ -215,9 +219,10 @@ func (c *commandVolumeFixReplication) fixUnderReplicatedVolumes(commandEnv *Comm
 	return nil
 }
 
-func keepDataNodesSorted(dataNodes []location) {
+func keepDataNodesSorted(dataNodes []location, diskType string) {
+	fn := capacityByFreeVolumeCount(types.ToDiskType(diskType))
 	sort.Slice(dataNodes, func(i, j int) bool {
-		return dataNodes[i].dataNode.FreeVolumeCount > dataNodes[j].dataNode.FreeVolumeCount
+		return fn(dataNodes[i].dataNode) > fn(dataNodes[j].dataNode)
 	})
 }
 
diff --git a/weed/shell/command_volume_fsck.go b/weed/shell/command_volume_fsck.go
index 75b0f28da..677f38856 100644
--- a/weed/shell/command_volume_fsck.go
+++ b/weed/shell/command_volume_fsck.go
@@ -285,18 +285,20 @@ func (c *commandVolumeFsck) collectVolumeIds(verbose bool, writer io.Writer) (vo
 	}
 
 	eachDataNode(resp.TopologyInfo, func(dc string, rack RackId, t *master_pb.DataNodeInfo) {
-		for _, vi := range t.VolumeInfos {
-			volumeIdToServer[vi.Id] = VInfo{
-				server:     t.Id,
-				collection: vi.Collection,
-				isEcVolume: false,
+		for _, diskInfo := range t.DiskInfos{
+			for _, vi := range diskInfo.VolumeInfos {
+				volumeIdToServer[vi.Id] = VInfo{
+					server:     t.Id,
+					collection: vi.Collection,
+					isEcVolume: false,
+				}
 			}
-		}
-		for _, ecShardInfo := range t.EcShardInfos {
-			volumeIdToServer[ecShardInfo.Id] = VInfo{
-				server:     t.Id,
-				collection: ecShardInfo.Collection,
-				isEcVolume: true,
+			for _, ecShardInfo := range diskInfo.EcShardInfos {
+				volumeIdToServer[ecShardInfo.Id] = VInfo{
+					server:     t.Id,
+					collection: ecShardInfo.Collection,
+					isEcVolume: true,
+				}
 			}
 		}
 	})
diff --git a/weed/shell/command_volume_list.go b/weed/shell/command_volume_list.go
index c5a9388fa..dc8783cd1 100644
--- a/weed/shell/command_volume_list.go
+++ b/weed/shell/command_volume_list.go
@@ -1,6 +1,7 @@
 package shell
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
@@ -44,8 +45,25 @@ func (c *commandVolumeList) Do(args []string, commandEnv *CommandEnv, writer io.
 	return nil
 }
 
+func diskInfosToString(diskInfos map[string]*master_pb.DiskInfo) string {
+	var buf bytes.Buffer
+	for diskType, diskInfo := range diskInfos {
+		if diskType == "" {
+			diskType = "hdd"
+		}
+		fmt.Fprintf(&buf, " %s(volume:%d/%d active:%d free:%d remote:%d)", diskType, diskInfo.VolumeCount, diskInfo.MaxVolumeCount, diskInfo.ActiveVolumeCount, diskInfo.FreeVolumeCount, diskInfo.RemoteVolumeCount)
+	}
+	return buf.String()
+}
+
+func diskInfoToString(diskInfo *master_pb.DiskInfo) string {
+	var buf bytes.Buffer
+	fmt.Fprintf(&buf, "volume:%d/%d active:%d free:%d remote:%d", diskInfo.VolumeCount, diskInfo.MaxVolumeCount, diskInfo.ActiveVolumeCount, diskInfo.FreeVolumeCount, diskInfo.RemoteVolumeCount)
+	return buf.String()
+}
+
 func writeTopologyInfo(writer io.Writer, t *master_pb.TopologyInfo, volumeSizeLimitMb uint64) statistics {
-	fmt.Fprintf(writer, "Topology volume:%d/%d active:%d free:%d remote:%d volumeSizeLimit:%d MB\n", t.VolumeCount, t.MaxVolumeCount, t.ActiveVolumeCount, t.FreeVolumeCount, t.RemoteVolumeCount, volumeSizeLimitMb)
+	fmt.Fprintf(writer, "Topology volumeSizeLimit:%d MB%s\n", volumeSizeLimitMb, diskInfosToString(t.DiskInfos))
 	sort.Slice(t.DataCenterInfos, func(i, j int) bool {
 		return t.DataCenterInfos[i].Id < t.DataCenterInfos[j].Id
 	})
@@ -57,7 +75,7 @@ func writeTopologyInfo(writer io.Writer, t *master_pb.TopologyInfo, volumeSizeLi
 	return s
 }
 func writeDataCenterInfo(writer io.Writer, t *master_pb.DataCenterInfo) statistics {
-	fmt.Fprintf(writer, "  DataCenter %s volume:%d/%d active:%d free:%d remote:%d\n", t.Id, t.VolumeCount, t.MaxVolumeCount, t.ActiveVolumeCount, t.FreeVolumeCount, t.RemoteVolumeCount)
+	fmt.Fprintf(writer, "  DataCenter %s%s\n", t.Id, diskInfosToString(t.DiskInfos))
 	var s statistics
 	sort.Slice(t.RackInfos, func(i, j int) bool {
 		return t.RackInfos[i].Id < t.RackInfos[j].Id
@@ -69,7 +87,7 @@ func writeDataCenterInfo(writer io.Writer, t *master_pb.DataCenterInfo) statisti
 	return s
 }
 func writeRackInfo(writer io.Writer, t *master_pb.RackInfo) statistics {
-	fmt.Fprintf(writer, "    Rack %s volume:%d/%d active:%d free:%d remote:%d\n", t.Id, t.VolumeCount, t.MaxVolumeCount, t.ActiveVolumeCount, t.FreeVolumeCount, t.RemoteVolumeCount)
+	fmt.Fprintf(writer, "    Rack %s%s\n", t.Id, diskInfosToString(t.DiskInfos))
 	var s statistics
 	sort.Slice(t.DataNodeInfos, func(i, j int) bool {
 		return t.DataNodeInfos[i].Id < t.DataNodeInfos[j].Id
@@ -81,8 +99,22 @@ func writeRackInfo(writer io.Writer, t *master_pb.RackInfo) statistics {
 	return s
 }
 func writeDataNodeInfo(writer io.Writer, t *master_pb.DataNodeInfo) statistics {
-	fmt.Fprintf(writer, "      DataNode %s volume:%d/%d active:%d free:%d remote:%d\n", t.Id, t.VolumeCount, t.MaxVolumeCount, t.ActiveVolumeCount, t.FreeVolumeCount, t.RemoteVolumeCount)
+	fmt.Fprintf(writer, "      DataNode %s%s\n", t.Id, diskInfosToString(t.DiskInfos))
+	var s statistics
+	for _, diskInfo := range t.DiskInfos {
+		s = s.plus(writeDiskInfo(writer, diskInfo))
+	}
+	fmt.Fprintf(writer, "      DataNode %s %+v \n", t.Id, s)
+	return s
+}
+
+func writeDiskInfo(writer io.Writer, t *master_pb.DiskInfo) statistics {
 	var s statistics
+	diskType := t.Type
+	if diskType == "" {
+		diskType = "hdd"
+	}
+	fmt.Fprintf(writer, "        Disk %s(%s)\n", diskType, diskInfoToString(t))
 	sort.Slice(t.VolumeInfos, func(i, j int) bool {
 		return t.VolumeInfos[i].Id < t.VolumeInfos[j].Id
 	})
@@ -90,13 +122,14 @@ func writeDataNodeInfo(writer io.Writer, t *master_pb.DataNodeInfo) statistics {
 		s = s.plus(writeVolumeInformationMessage(writer, vi))
 	}
 	for _, ecShardInfo := range t.EcShardInfos {
-		fmt.Fprintf(writer, "        ec volume id:%v collection:%v shards:%v\n", ecShardInfo.Id, ecShardInfo.Collection, erasure_coding.ShardBits(ecShardInfo.EcIndexBits).ShardIds())
+		fmt.Fprintf(writer, "          ec volume id:%v collection:%v shards:%v\n", ecShardInfo.Id, ecShardInfo.Collection, erasure_coding.ShardBits(ecShardInfo.EcIndexBits).ShardIds())
 	}
-	fmt.Fprintf(writer, "      DataNode %s %+v \n", t.Id, s)
+	fmt.Fprintf(writer, "        Disk %s %+v \n", diskType, s)
 	return s
 }
+
 func writeVolumeInformationMessage(writer io.Writer, t *master_pb.VolumeInformationMessage) statistics {
-	fmt.Fprintf(writer, "        volume %+v \n", t)
+	fmt.Fprintf(writer, "          volume %+v \n", t)
 	return newStatistics(t)
 }
 
diff --git a/weed/shell/command_volume_server_evacuate.go b/weed/shell/command_volume_server_evacuate.go
index 1539ccb19..5216de66b 100644
--- a/weed/shell/command_volume_server_evacuate.go
+++ b/weed/shell/command_volume_server_evacuate.go
@@ -8,6 +8,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"io"
 	"os"
 	"sort"
@@ -100,17 +101,19 @@ func evacuateNormalVolumes(commandEnv *CommandEnv, resp *master_pb.VolumeListRes
 
 	// move away normal volumes
 	volumeReplicas, _ := collectVolumeReplicaLocations(resp)
-	for _, vol := range thisNode.info.VolumeInfos {
-		hasMoved, err := moveAwayOneNormalVolume(commandEnv, volumeReplicas, vol, thisNode, otherNodes, applyChange)
-		if err != nil {
-			return fmt.Errorf("move away volume %d from %s: %v", vol.Id, volumeServer, err)
-		}
-		if !hasMoved {
-			if skipNonMoveable {
-				replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(vol.ReplicaPlacement))
-				fmt.Fprintf(writer, "skipping non moveable volume %d replication:%s\n", vol.Id, replicaPlacement.String())
-			} else {
-				return fmt.Errorf("failed to move volume %d from %s", vol.Id, volumeServer)
+	for _, diskInfo := range thisNode.info.DiskInfos {
+		for _, vol := range diskInfo.VolumeInfos {
+			hasMoved, err := moveAwayOneNormalVolume(commandEnv, volumeReplicas, vol, thisNode, otherNodes, applyChange)
+			if err != nil {
+				return fmt.Errorf("move away volume %d from %s: %v", vol.Id, volumeServer, err)
+			}
+			if !hasMoved {
+				if skipNonMoveable {
+					replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(vol.ReplicaPlacement))
+					fmt.Fprintf(writer, "skipping non moveable volume %d replication:%s\n", vol.Id, replicaPlacement.String())
+				} else {
+					return fmt.Errorf("failed to move volume %d from %s", vol.Id, volumeServer)
+				}
 			}
 		}
 	}
@@ -126,16 +129,18 @@ func evacuateEcVolumes(commandEnv *CommandEnv, resp *master_pb.VolumeListRespons
 	}
 
 	// move away ec volumes
-	for _, ecShardInfo := range thisNode.info.EcShardInfos {
-		hasMoved, err := moveAwayOneEcVolume(commandEnv, ecShardInfo, thisNode, otherNodes, applyChange)
-		if err != nil {
-			return fmt.Errorf("move away volume %d from %s: %v", ecShardInfo.Id, volumeServer, err)
-		}
-		if !hasMoved {
-			if skipNonMoveable {
-				fmt.Fprintf(writer, "failed to move away ec volume %d from %s\n", ecShardInfo.Id, volumeServer)
-			} else {
-				return fmt.Errorf("failed to move away ec volume %d from %s", ecShardInfo.Id, volumeServer)
+	for _, diskInfo := range thisNode.info.DiskInfos {
+		for _, ecShardInfo := range diskInfo.EcShardInfos {
+			hasMoved, err := moveAwayOneEcVolume(commandEnv, ecShardInfo, thisNode, otherNodes, applyChange)
+			if err != nil {
+				return fmt.Errorf("move away volume %d from %s: %v", ecShardInfo.Id, volumeServer, err)
+			}
+			if !hasMoved {
+				if skipNonMoveable {
+					fmt.Fprintf(writer, "failed to move away ec volume %d from %s\n", ecShardInfo.Id, volumeServer)
+				} else {
+					return fmt.Errorf("failed to move away ec volume %d from %s", ecShardInfo.Id, volumeServer)
+				}
 			}
 		}
 	}
@@ -174,8 +179,9 @@ func moveAwayOneEcVolume(commandEnv *CommandEnv, ecShardInfo *master_pb.VolumeEc
 }
 
 func moveAwayOneNormalVolume(commandEnv *CommandEnv, volumeReplicas map[uint32][]*VolumeReplica, vol *master_pb.VolumeInformationMessage, thisNode *Node, otherNodes []*Node, applyChange bool) (hasMoved bool, err error) {
+	fn := capacityByFreeVolumeCount(types.ToDiskType(vol.DiskType))
 	sort.Slice(otherNodes, func(i, j int) bool {
-		return otherNodes[i].localVolumeRatio(capacityByMaxVolumeCount)+otherNodes[i].localVolumeRatio(capacityByMaxSsdVolumeCount) < otherNodes[j].localVolumeRatio(capacityByMaxVolumeCount)+otherNodes[j].localVolumeRatio(capacityByMaxSsdVolumeCount)
+		return otherNodes[i].localVolumeRatio(fn) > otherNodes[j].localVolumeRatio(fn)
 	})
 
 	for i := 0; i < len(otherNodes); i++ {
diff --git a/weed/shell/command_volume_tier_download.go b/weed/shell/command_volume_tier_download.go
index d31c8c031..8aeb34d5c 100644
--- a/weed/shell/command_volume_tier_download.go
+++ b/weed/shell/command_volume_tier_download.go
@@ -86,9 +86,11 @@ func collectRemoteVolumes(topoInfo *master_pb.TopologyInfo, selectedCollection s
 
 	vidMap := make(map[uint32]bool)
 	eachDataNode(topoInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
-		for _, v := range dn.VolumeInfos {
-			if v.Collection == selectedCollection && v.RemoteStorageKey != "" && v.RemoteStorageName != "" {
-				vidMap[v.Id] = true
+		for _, diskInfo := range dn.DiskInfos {
+			for _, v := range diskInfo.VolumeInfos {
+				if v.Collection == selectedCollection && v.RemoteStorageKey != "" && v.RemoteStorageName != "" {
+					vidMap[v.Id] = true
+				}
 			}
 		}
 	})
diff --git a/weed/shell/command_volume_tier_move.go b/weed/shell/command_volume_tier_move.go
new file mode 100644
index 000000000..3c6c31eac
--- /dev/null
+++ b/weed/shell/command_volume_tier_move.go
@@ -0,0 +1,108 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"io"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+)
+
+func init() {
+	Commands = append(Commands, &commandVolumeTierMove{})
+}
+
+type commandVolumeTierMove struct {
+}
+
+func (c *commandVolumeTierMove) Name() string {
+	return "volume.tier.upload"
+}
+
+func (c *commandVolumeTierMove) Help() string {
+	return `change a volume from one disk type to another
+
+	volume.tier.move -source=hdd -target=ssd [-collection=""] [-fullPercent=95] [-quietFor=1h]
+	volume.tier.move -target=hdd [-collection=""] -volumeId=<volume_id>
+
+`
+}
+
+func (c *commandVolumeTierMove) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	if err = commandEnv.confirmIsLocked(); err != nil {
+		return
+	}
+
+	tierCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	volumeId := tierCommand.Int("volumeId", 0, "the volume id")
+	collection := tierCommand.String("collection", "", "the collection name")
+	fullPercentage := tierCommand.Float64("fullPercent", 95, "the volume reaches the percentage of max volume size")
+	quietPeriod := tierCommand.Duration("quietFor", 24*time.Hour, "select volumes without no writes for this period")
+	source := tierCommand.String("fromDiskType", "", "the source disk type")
+	target := tierCommand.String("toDiskType", "", "the target disk type")
+	if err = tierCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	if *source == *target {
+		return fmt.Errorf("source tier %s is the same as target tier %s", *source, *target)
+	}
+
+	vid := needle.VolumeId(*volumeId)
+
+	// volumeId is provided
+	if vid != 0 {
+		// return doVolumeTierMove(commandEnv, writer, *collection, vid, *dest, *keepLocalDatFile)
+	}
+
+	// apply to all volumes in the collection
+	// reusing collectVolumeIdsForEcEncode for now
+	volumeIds, err := collectVolumeIdsForTierChange(commandEnv, *source, *collection, *fullPercentage, *quietPeriod)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("tier move volumes: %v\n", volumeIds)
+
+	return nil
+}
+
+func collectVolumeIdsForTierChange(commandEnv *CommandEnv, sourceTier string, selectedCollection string, fullPercentage float64, quietPeriod time.Duration) (vids []needle.VolumeId, err error) {
+
+	var resp *master_pb.VolumeListResponse
+	err = commandEnv.MasterClient.WithClient(func(client master_pb.SeaweedClient) error {
+		resp, err = client.VolumeList(context.Background(), &master_pb.VolumeListRequest{})
+		return err
+	})
+	if err != nil {
+		return
+	}
+
+	quietSeconds := int64(quietPeriod / time.Second)
+	nowUnixSeconds := time.Now().Unix()
+
+	fmt.Printf("collect %s volumes quiet for: %d seconds\n", sourceTier, quietSeconds)
+
+	vidMap := make(map[uint32]bool)
+	eachDataNode(resp.TopologyInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
+		for _, diskInfo := range dn.DiskInfos {
+			for _, v := range diskInfo.VolumeInfos {
+				if v.Collection == selectedCollection && v.ModifiedAtSecond+quietSeconds < nowUnixSeconds && types.ToDiskType(v.DiskType) == types.ToDiskType(sourceTier) {
+					if float64(v.Size) > fullPercentage/100*float64(resp.VolumeSizeLimitMb)*1024*1024 {
+						vidMap[v.Id] = true
+					}
+				}
+			}
+		}
+	})
+
+	for vid := range vidMap {
+		vids = append(vids, needle.VolumeId(vid))
+	}
+
+	return
+}
diff --git a/weed/storage/disk_location.go b/weed/storage/disk_location.go
index 7292c23f6..6de87c793 100644
--- a/weed/storage/disk_location.go
+++ b/weed/storage/disk_location.go
@@ -2,6 +2,7 @@ package storage
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -19,7 +20,7 @@ import (
 type DiskLocation struct {
 	Directory              string
 	IdxDirectory           string
-	DiskType               DiskType
+	DiskType               types.DiskType
 	MaxVolumeCount         int
 	OriginalMaxVolumeCount int
 	MinFreeSpacePercent    float32
@@ -33,7 +34,7 @@ type DiskLocation struct {
 	isDiskSpaceLow bool
 }
 
-func NewDiskLocation(dir string, maxVolumeCount int, minFreeSpacePercent float32, idxDir string, diskType DiskType) *DiskLocation {
+func NewDiskLocation(dir string, maxVolumeCount int, minFreeSpacePercent float32, idxDir string, diskType types.DiskType) *DiskLocation {
 	dir = util.ResolvePath(dir)
 	if idxDir == "" {
 		idxDir = dir
diff --git a/weed/storage/disk_location_ec.go b/weed/storage/disk_location_ec.go
index d1237b40f..0ab45011c 100644
--- a/weed/storage/disk_location_ec.go
+++ b/weed/storage/disk_location_ec.go
@@ -57,7 +57,7 @@ func (l *DiskLocation) FindEcShard(vid needle.VolumeId, shardId erasure_coding.S
 
 func (l *DiskLocation) LoadEcShard(collection string, vid needle.VolumeId, shardId erasure_coding.ShardId) (err error) {
 
-	ecVolumeShard, err := erasure_coding.NewEcVolumeShard(l.Directory, collection, vid, shardId)
+	ecVolumeShard, err := erasure_coding.NewEcVolumeShard(l.DiskType, l.Directory, collection, vid, shardId)
 	if err != nil {
 		if err == os.ErrNotExist {
 			return os.ErrNotExist
@@ -68,7 +68,7 @@ func (l *DiskLocation) LoadEcShard(collection string, vid needle.VolumeId, shard
 	defer l.ecVolumesLock.Unlock()
 	ecVolume, found := l.ecVolumes[vid]
 	if !found {
-		ecVolume, err = erasure_coding.NewEcVolume(l.Directory, l.IdxDirectory, collection, vid)
+		ecVolume, err = erasure_coding.NewEcVolume(l.DiskType, l.Directory, l.IdxDirectory, collection, vid)
 		if err != nil {
 			return fmt.Errorf("failed to create ec volume %d: %v", vid, err)
 		}
diff --git a/weed/storage/erasure_coding/ec_shard.go b/weed/storage/erasure_coding/ec_shard.go
index 74ed99198..2a57d85ef 100644
--- a/weed/storage/erasure_coding/ec_shard.go
+++ b/weed/storage/erasure_coding/ec_shard.go
@@ -2,6 +2,7 @@ package erasure_coding
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"os"
 	"path"
 	"strconv"
@@ -20,11 +21,12 @@ type EcVolumeShard struct {
 	dir         string
 	ecdFile     *os.File
 	ecdFileSize int64
+	DiskType    types.DiskType
 }
 
-func NewEcVolumeShard(dirname string, collection string, id needle.VolumeId, shardId ShardId) (v *EcVolumeShard, e error) {
+func NewEcVolumeShard(diskType types.DiskType, dirname string, collection string, id needle.VolumeId, shardId ShardId) (v *EcVolumeShard, e error) {
 
-	v = &EcVolumeShard{dir: dirname, Collection: collection, VolumeId: id, ShardId: shardId}
+	v = &EcVolumeShard{dir: dirname, Collection: collection, VolumeId: id, ShardId: shardId, DiskType: diskType}
 
 	baseFileName := v.FileName()
 
diff --git a/weed/storage/erasure_coding/ec_volume.go b/weed/storage/erasure_coding/ec_volume.go
index a9d08ed0e..85d6a5fc8 100644
--- a/weed/storage/erasure_coding/ec_volume.go
+++ b/weed/storage/erasure_coding/ec_volume.go
@@ -36,10 +36,11 @@ type EcVolume struct {
 	Version                   needle.Version
 	ecjFile                   *os.File
 	ecjFileAccessLock         sync.Mutex
+	diskType                  types.DiskType
 }
 
-func NewEcVolume(dir string, dirIdx string, collection string, vid needle.VolumeId) (ev *EcVolume, err error) {
-	ev = &EcVolume{dir: dir, dirIdx: dirIdx, Collection: collection, VolumeId: vid}
+func NewEcVolume(diskType types.DiskType, dir string, dirIdx string, collection string, vid needle.VolumeId) (ev *EcVolume, err error) {
+	ev = &EcVolume{dir: dir, dirIdx: dirIdx, Collection: collection, VolumeId: vid, diskType: diskType}
 
 	dataBaseFileName := EcShardFileName(collection, dir, int(vid))
 	indexBaseFileName := EcShardFileName(collection, dirIdx, int(vid))
@@ -191,6 +192,7 @@ func (ev *EcVolume) ToVolumeEcShardInformationMessage() (messages []*master_pb.V
 			m = &master_pb.VolumeEcShardInformationMessage{
 				Id:         uint32(s.VolumeId),
 				Collection: s.Collection,
+				DiskType:   string(ev.diskType),
 			}
 			messages = append(messages, m)
 		}
diff --git a/weed/storage/erasure_coding/ec_volume_info.go b/weed/storage/erasure_coding/ec_volume_info.go
index 8ff65bb0f..3dd535e64 100644
--- a/weed/storage/erasure_coding/ec_volume_info.go
+++ b/weed/storage/erasure_coding/ec_volume_info.go
@@ -10,13 +10,15 @@ type EcVolumeInfo struct {
 	VolumeId   needle.VolumeId
 	Collection string
 	ShardBits  ShardBits
+	DiskType   string
 }
 
-func NewEcVolumeInfo(collection string, vid needle.VolumeId, shardBits ShardBits) *EcVolumeInfo {
+func NewEcVolumeInfo(diskType string, collection string, vid needle.VolumeId, shardBits ShardBits) *EcVolumeInfo {
 	return &EcVolumeInfo{
 		Collection: collection,
 		VolumeId:   vid,
 		ShardBits:  shardBits,
+		DiskType:   diskType,
 	}
 }
 
@@ -45,6 +47,7 @@ func (ecInfo *EcVolumeInfo) Minus(other *EcVolumeInfo) *EcVolumeInfo {
 		VolumeId:   ecInfo.VolumeId,
 		Collection: ecInfo.Collection,
 		ShardBits:  ecInfo.ShardBits.Minus(other.ShardBits),
+		DiskType:   ecInfo.DiskType,
 	}
 
 	return ret
@@ -55,6 +58,7 @@ func (ecInfo *EcVolumeInfo) ToVolumeEcShardInformationMessage() (ret *master_pb.
 		Id:          uint32(ecInfo.VolumeId),
 		EcIndexBits: uint32(ecInfo.ShardBits),
 		Collection:  ecInfo.Collection,
+		DiskType:    ecInfo.DiskType,
 	}
 }
 
diff --git a/weed/storage/store.go b/weed/storage/store.go
index 4bb05649c..92f1db2bc 100644
--- a/weed/storage/store.go
+++ b/weed/storage/store.go
@@ -207,19 +207,13 @@ func (s *Store) GetRack() string {
 
 func (s *Store) CollectHeartbeat() *master_pb.Heartbeat {
 	var volumeMessages []*master_pb.VolumeInformationMessage
-	maxVolumeCount := 0
-	maxSsdVolumeCount := 0
+	maxVolumeCounts := make(map[string]uint32)
 	var maxFileKey NeedleId
 	collectionVolumeSize := make(map[string]uint64)
 	collectionVolumeReadOnlyCount := make(map[string]map[string]uint8)
 	for _, location := range s.Locations {
 		var deleteVids []needle.VolumeId
-		switch location.DiskType {
-		case SsdType:
-			maxSsdVolumeCount = maxSsdVolumeCount + location.MaxVolumeCount
-		case HardDriveType:
-			maxVolumeCount = maxVolumeCount + location.MaxVolumeCount
-		}
+		maxVolumeCounts[string(location.DiskType)] += uint32(location.MaxVolumeCount)
 		location.volumesLock.RLock()
 		for _, v := range location.volumes {
 			curMaxFileKey, volumeMessage := v.ToVolumeInformationMessage()
@@ -294,8 +288,7 @@ func (s *Store) CollectHeartbeat() *master_pb.Heartbeat {
 		Ip:                s.Ip,
 		Port:              uint32(s.Port),
 		PublicUrl:         s.PublicUrl,
-		MaxVolumeCount:    uint32(maxVolumeCount),
-		MaxSsdVolumeCount: uint32(maxSsdVolumeCount),
+		MaxVolumeCounts:   maxVolumeCounts,
 		MaxFileKey:        NeedleIdToUint64(maxFileKey),
 		DataCenter:        s.dataCenter,
 		Rack:              s.rack,
@@ -478,6 +471,9 @@ func (s *Store) GetVolumeSizeLimit() uint64 {
 
 func (s *Store) MaybeAdjustVolumeMax() (hasChanges bool) {
 	volumeSizeLimit := s.GetVolumeSizeLimit()
+	if volumeSizeLimit == 0 {
+		return
+	}
 	for _, diskLocation := range s.Locations {
 		if diskLocation.OriginalMaxVolumeCount == 0 {
 			currentMaxVolumeCount := diskLocation.MaxVolumeCount
diff --git a/weed/storage/store_ec.go b/weed/storage/store_ec.go
index ab4e96634..a9b6a8ff3 100644
--- a/weed/storage/store_ec.go
+++ b/weed/storage/store_ec.go
@@ -58,6 +58,7 @@ func (s *Store) MountEcShards(collection string, vid needle.VolumeId, shardId er
 				Id:          uint32(vid),
 				Collection:  collection,
 				EcIndexBits: uint32(shardBits.AddShardId(shardId)),
+				DiskType:    string(location.DiskType),
 			}
 			return nil
 		} else if err == os.ErrNotExist {
@@ -82,6 +83,7 @@ func (s *Store) UnmountEcShards(vid needle.VolumeId, shardId erasure_coding.Shar
 		Id:          uint32(vid),
 		Collection:  ecShard.Collection,
 		EcIndexBits: uint32(shardBits.AddShardId(shardId)),
+		DiskType:    string(ecShard.DiskType),
 	}
 
 	for _, location := range s.Locations {
diff --git a/weed/storage/volume_disk_type.go b/weed/storage/types/volume_disk_type.go
similarity index 93%
rename from weed/storage/volume_disk_type.go
rename to weed/storage/types/volume_disk_type.go
index 4d14ada63..0e199a626 100644
--- a/weed/storage/volume_disk_type.go
+++ b/weed/storage/types/volume_disk_type.go
@@ -1,4 +1,4 @@
-package storage
+package types
 
 import (
 	"strings"
@@ -27,7 +27,7 @@ func ToDiskType(vt string) (diskType DiskType) {
 
 func (diskType DiskType) String() string{
 	if diskType == "" {
-		return "hdd"
+		return ""
 	}
 	return string(diskType)
 }
diff --git a/weed/storage/volume.go b/weed/storage/volume.go
index afa0fbf28..366449c53 100644
--- a/weed/storage/volume.go
+++ b/weed/storage/volume.go
@@ -171,7 +171,7 @@ func (v *Volume) IndexFileSize() uint64 {
 	return v.nm.IndexFileSize()
 }
 
-func (v *Volume) DiskType() DiskType {
+func (v *Volume) DiskType() types.DiskType {
 	return v.location.DiskType
 }
 
diff --git a/weed/topology/collection.go b/weed/topology/collection.go
index 0c5dc5db7..a14b68851 100644
--- a/weed/topology/collection.go
+++ b/weed/topology/collection.go
@@ -2,7 +2,7 @@ package topology
 
 import (
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/storage"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
@@ -30,12 +30,12 @@ func (c *Collection) String() string {
 	return fmt.Sprintf("Name:%s, volumeSizeLimit:%d, storageType2VolumeLayout:%v", c.Name, c.volumeSizeLimit, c.storageType2VolumeLayout)
 }
 
-func (c *Collection) GetOrCreateVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType storage.DiskType) *VolumeLayout {
+func (c *Collection) GetOrCreateVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType types.DiskType) *VolumeLayout {
 	keyString := rp.String()
 	if ttl != nil {
 		keyString += ttl.String()
 	}
-	if diskType != storage.HardDriveType {
+	if diskType != types.HardDriveType {
 		keyString += string(diskType)
 	}
 	vl := c.storageType2VolumeLayout.Get(keyString, func() interface{} {
@@ -44,12 +44,12 @@ func (c *Collection) GetOrCreateVolumeLayout(rp *super_block.ReplicaPlacement, t
 	return vl.(*VolumeLayout)
 }
 
-func (c *Collection) DeleteVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType storage.DiskType) {
+func (c *Collection) DeleteVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType types.DiskType) {
 	keyString := rp.String()
 	if ttl != nil {
 		keyString += ttl.String()
 	}
-	if diskType != storage.HardDriveType {
+	if diskType != types.HardDriveType {
 		keyString += string(diskType)
 	}
 	c.storageType2VolumeLayout.Delete(keyString)
diff --git a/weed/topology/data_center.go b/weed/topology/data_center.go
index 6ca94b52d..60d91ba6d 100644
--- a/weed/topology/data_center.go
+++ b/weed/topology/data_center.go
@@ -1,6 +1,8 @@
 package topology
 
-import "github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+import (
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+)
 
 type DataCenter struct {
 	NodeImpl
@@ -10,6 +12,7 @@ func NewDataCenter(id string) *DataCenter {
 	dc := &DataCenter{}
 	dc.id = NodeId(id)
 	dc.nodeType = "DataCenter"
+	dc.diskUsages = newDiskUsages()
 	dc.children = make(map[NodeId]Node)
 	dc.NodeImpl.value = dc
 	return dc
@@ -30,9 +33,6 @@ func (dc *DataCenter) GetOrCreateRack(rackName string) *Rack {
 func (dc *DataCenter) ToMap() interface{} {
 	m := make(map[string]interface{})
 	m["Id"] = dc.Id()
-	m["Max"] = dc.GetMaxVolumeCount()
-	m["MaxSsd"] = dc.GetMaxSsdVolumeCount()
-	m["Free"] = dc.FreeSpace()
 	var racks []interface{}
 	for _, c := range dc.Children() {
 		rack := c.(*Rack)
@@ -44,14 +44,8 @@ func (dc *DataCenter) ToMap() interface{} {
 
 func (dc *DataCenter) ToDataCenterInfo() *master_pb.DataCenterInfo {
 	m := &master_pb.DataCenterInfo{
-		Id:                string(dc.Id()),
-		VolumeCount:       uint64(dc.GetVolumeCount()),
-		MaxVolumeCount:    uint64(dc.GetMaxVolumeCount()),
-		MaxSsdVolumeCount: uint64(dc.GetMaxSsdVolumeCount()),
-		SsdVolumeCount:    uint64(dc.GetSsdVolumeCount()),
-		FreeVolumeCount:   uint64(dc.FreeSpace()),
-		ActiveVolumeCount: uint64(dc.GetActiveVolumeCount()),
-		RemoteVolumeCount: uint64(dc.GetRemoteVolumeCount()),
+		Id:        string(dc.Id()),
+		DiskInfos: dc.diskUsages.ToDiskInfo(),
 	}
 	for _, c := range dc.Children() {
 		rack := c.(*Rack)
diff --git a/weed/topology/data_node.go b/weed/topology/data_node.go
index 816139ac3..1a0ebf761 100644
--- a/weed/topology/data_node.go
+++ b/weed/topology/data_node.go
@@ -2,13 +2,11 @@ package topology
 
 import (
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/util"
-	"strconv"
-	"sync"
-
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
-	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"strconv"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/storage"
@@ -16,29 +14,26 @@ import (
 
 type DataNode struct {
 	NodeImpl
-	volumes      map[needle.VolumeId]storage.VolumeInfo
-	Ip           string
-	Port         int
-	PublicUrl    string
-	LastSeen     int64 // unix time in seconds
-	ecShards     map[needle.VolumeId]*erasure_coding.EcVolumeInfo
-	ecShardsLock sync.RWMutex
+	Ip        string
+	Port      int
+	PublicUrl string
+	LastSeen  int64 // unix time in seconds
 }
 
 func NewDataNode(id string) *DataNode {
-	s := &DataNode{}
-	s.id = NodeId(id)
-	s.nodeType = "DataNode"
-	s.volumes = make(map[needle.VolumeId]storage.VolumeInfo)
-	s.ecShards = make(map[needle.VolumeId]*erasure_coding.EcVolumeInfo)
-	s.NodeImpl.value = s
-	return s
+	dn := &DataNode{}
+	dn.id = NodeId(id)
+	dn.nodeType = "DataNode"
+	dn.diskUsages = newDiskUsages()
+	dn.children = make(map[NodeId]Node)
+	dn.NodeImpl.value = dn
+	return dn
 }
 
 func (dn *DataNode) String() string {
 	dn.RLock()
 	defer dn.RUnlock()
-	return fmt.Sprintf("Node:%s, volumes:%v, Ip:%s, Port:%d, PublicUrl:%s", dn.NodeImpl.String(), dn.volumes, dn.Ip, dn.Port, dn.PublicUrl)
+	return fmt.Sprintf("Node:%s, Ip:%s, Port:%d, PublicUrl:%s", dn.NodeImpl.String(), dn.Ip, dn.Port, dn.PublicUrl)
 }
 
 func (dn *DataNode) AddOrUpdateVolume(v storage.VolumeInfo) (isNew, isChangedRO bool) {
@@ -47,37 +42,23 @@ func (dn *DataNode) AddOrUpdateVolume(v storage.VolumeInfo) (isNew, isChangedRO
 	return dn.doAddOrUpdateVolume(v)
 }
 
-func (dn *DataNode) doAddOrUpdateVolume(v storage.VolumeInfo) (isNew, isChangedRO bool) {
-	if oldV, ok := dn.volumes[v.Id]; !ok {
-		dn.volumes[v.Id] = v
-		if v.DiskType == storage.SsdType {
-			dn.UpAdjustSsdVolumeCountDelta(1)
-		} else {
-			dn.UpAdjustVolumeCountDelta(1)
-		}
-		if v.IsRemote() {
-			dn.UpAdjustRemoteVolumeCountDelta(1)
-		}
-		if !v.ReadOnly {
-			dn.UpAdjustActiveVolumeCountDelta(1)
-		}
-		dn.UpAdjustMaxVolumeId(v.Id)
-		isNew = true
-	} else {
-		if oldV.IsRemote() != v.IsRemote() {
-			if v.IsRemote() {
-				dn.UpAdjustRemoteVolumeCountDelta(1)
-			}
-			if oldV.IsRemote() {
-				dn.UpAdjustRemoteVolumeCountDelta(-1)
-			}
-		}
-		isChangedRO = dn.volumes[v.Id].ReadOnly != v.ReadOnly
-		dn.volumes[v.Id] = v
+func (dn *DataNode) getOrCreateDisk(diskType string) *Disk {
+	c, found := dn.children[NodeId(diskType)]
+	if !found {
+		c = NewDisk(diskType)
+		dn.doLinkChildNode(c)
 	}
-	return
+	disk := c.(*Disk)
+	return disk
+}
+
+func (dn *DataNode) doAddOrUpdateVolume(v storage.VolumeInfo) (isNew, isChangedRO bool) {
+	disk := dn.getOrCreateDisk(v.DiskType)
+	return disk.AddOrUpdateVolume(v)
 }
 
+// UpdateVolumes detects new/deleted/changed volumes on a volume server
+// used in master to notify master clients of these changes.
 func (dn *DataNode) UpdateVolumes(actualVolumes []storage.VolumeInfo) (newVolumes, deletedVolumes, changeRO []storage.VolumeInfo) {
 
 	actualVolumeMap := make(map[needle.VolumeId]storage.VolumeInfo)
@@ -88,22 +69,26 @@ func (dn *DataNode) UpdateVolumes(actualVolumes []storage.VolumeInfo) (newVolume
 	dn.Lock()
 	defer dn.Unlock()
 
-	for vid, v := range dn.volumes {
+	existingVolumes := dn.getVolumes()
+
+	for _, v := range existingVolumes {
+		vid := v.Id
 		if _, ok := actualVolumeMap[vid]; !ok {
 			glog.V(0).Infoln("Deleting volume id:", vid)
-			delete(dn.volumes, vid)
+			disk := dn.getOrCreateDisk(v.DiskType)
+			delete(disk.volumes, vid)
 			deletedVolumes = append(deletedVolumes, v)
-			if v.DiskType == storage.SsdType {
-				dn.UpAdjustSsdVolumeCountDelta(-1)
-			} else {
-				dn.UpAdjustVolumeCountDelta(-1)
-			}
+
+			deltaDiskUsages := newDiskUsages()
+			deltaDiskUsage := deltaDiskUsages.getOrCreateDisk(types.ToDiskType(v.DiskType))
+			deltaDiskUsage.volumeCount = -1
 			if v.IsRemote() {
-				dn.UpAdjustRemoteVolumeCountDelta(-1)
+				deltaDiskUsage.remoteVolumeCount = -1
 			}
 			if !v.ReadOnly {
-				dn.UpAdjustActiveVolumeCountDelta(-1)
+				deltaDiskUsage.activeVolumeCount = -1
 			}
+			disk.UpAdjustDiskUsageDelta(deltaDiskUsages)
 		}
 	}
 	for _, v := range actualVolumes {
@@ -123,18 +108,19 @@ func (dn *DataNode) DeltaUpdateVolumes(newVolumes, deletedVolumes []storage.Volu
 	defer dn.Unlock()
 
 	for _, v := range deletedVolumes {
-		delete(dn.volumes, v.Id)
-		if v.DiskType == storage.SsdType {
-			dn.UpAdjustSsdVolumeCountDelta(-1)
-		} else {
-			dn.UpAdjustVolumeCountDelta(-1)
-		}
+		disk := dn.getOrCreateDisk(v.DiskType)
+		delete(disk.volumes, v.Id)
+
+		deltaDiskUsages := newDiskUsages()
+		deltaDiskUsage := deltaDiskUsages.getOrCreateDisk(types.ToDiskType(v.DiskType))
+		deltaDiskUsage.volumeCount = -1
 		if v.IsRemote() {
-			dn.UpAdjustRemoteVolumeCountDelta(-1)
+			deltaDiskUsage.remoteVolumeCount = -1
 		}
 		if !v.ReadOnly {
-			dn.UpAdjustActiveVolumeCountDelta(-1)
+			deltaDiskUsage.activeVolumeCount = -1
 		}
+		disk.UpAdjustDiskUsageDelta(deltaDiskUsages)
 	}
 	for _, v := range newVolumes {
 		dn.doAddOrUpdateVolume(v)
@@ -142,20 +128,47 @@ func (dn *DataNode) DeltaUpdateVolumes(newVolumes, deletedVolumes []storage.Volu
 	return
 }
 
+func (dn *DataNode) AdjustMaxVolumeCounts(maxVolumeCounts map[string]uint32) {
+	deltaDiskUsages := newDiskUsages()
+	for diskType, maxVolumeCount := range maxVolumeCounts {
+		if maxVolumeCount == 0 {
+			// the volume server may have set the max to zero
+			continue
+		}
+		dt := types.ToDiskType(diskType)
+		currentDiskUsage := dn.diskUsages.getOrCreateDisk(dt)
+		if currentDiskUsage.maxVolumeCount == int64(maxVolumeCount) {
+			continue
+		}
+		disk := dn.getOrCreateDisk(dt.String())
+		deltaDiskUsage := deltaDiskUsages.getOrCreateDisk(dt)
+		deltaDiskUsage.maxVolumeCount = int64(maxVolumeCount) - currentDiskUsage.maxVolumeCount
+		disk.UpAdjustDiskUsageDelta(deltaDiskUsages)
+	}
+}
+
 func (dn *DataNode) GetVolumes() (ret []storage.VolumeInfo) {
 	dn.RLock()
-	for _, v := range dn.volumes {
-		ret = append(ret, v)
+	for _, c := range dn.children {
+		disk := c.(*Disk)
+		ret = append(ret, disk.GetVolumes()...)
 	}
 	dn.RUnlock()
 	return ret
 }
 
-func (dn *DataNode) GetVolumesById(id needle.VolumeId) (storage.VolumeInfo, error) {
+func (dn *DataNode) GetVolumesById(id needle.VolumeId) (vInfo storage.VolumeInfo, err error) {
 	dn.RLock()
 	defer dn.RUnlock()
-	vInfo, ok := dn.volumes[id]
-	if ok {
+	found := false
+	for _, c := range dn.children {
+		disk := c.(*Disk)
+		vInfo, found = disk.volumes[id]
+		if found {
+			break
+		}
+	}
+	if found {
 		return vInfo, nil
 	} else {
 		return storage.VolumeInfo{}, fmt.Errorf("volumeInfo not found")
@@ -193,31 +206,19 @@ func (dn *DataNode) Url() string {
 func (dn *DataNode) ToMap() interface{} {
 	ret := make(map[string]interface{})
 	ret["Url"] = dn.Url()
-	ret["Volumes"] = dn.GetVolumeCount() + dn.GetSsdVolumeCount()
-	ret["VolumeIds"] = dn.GetVolumeIds()
-	ret["EcShards"] = dn.GetEcShardCount()
-	ret["Max"] = dn.GetMaxVolumeCount() + dn.GetMaxSsdVolumeCount()
-	ret["Free"] = dn.FreeSpace()
 	ret["PublicUrl"] = dn.PublicUrl
+	ret["Disks"] = dn.diskUsages.ToMap()
 	return ret
 }
 
 func (dn *DataNode) ToDataNodeInfo() *master_pb.DataNodeInfo {
 	m := &master_pb.DataNodeInfo{
-		Id:                string(dn.Id()),
-		VolumeCount:       uint64(dn.GetVolumeCount()),
-		MaxVolumeCount:    uint64(dn.GetMaxVolumeCount()),
-		MaxSsdVolumeCount: uint64(dn.GetMaxSsdVolumeCount()),
-		SsdVolumeCount:    uint64(dn.GetSsdVolumeCount()),
-		FreeVolumeCount:   uint64(dn.FreeSpace()),
-		ActiveVolumeCount: uint64(dn.GetActiveVolumeCount()),
-		RemoteVolumeCount: uint64(dn.GetRemoteVolumeCount()),
+		Id:        string(dn.Id()),
+		DiskInfos: make(map[string]*master_pb.DiskInfo),
 	}
-	for _, v := range dn.GetVolumes() {
-		m.VolumeInfos = append(m.VolumeInfos, v.ToVolumeInformationMessage())
-	}
-	for _, ecv := range dn.GetEcShards() {
-		m.EcShardInfos = append(m.EcShardInfos, ecv.ToVolumeEcShardInformationMessage())
+	for _, c := range dn.Children() {
+		disk := c.(*Disk)
+		m.DiskInfos[string(disk.Id())] = disk.ToDiskInfo()
 	}
 	return m
 }
@@ -226,11 +227,21 @@ func (dn *DataNode) ToDataNodeInfo() *master_pb.DataNodeInfo {
 func (dn *DataNode) GetVolumeIds() string {
 	dn.RLock()
 	defer dn.RUnlock()
-	ids := make([]int, 0, len(dn.volumes))
+	existingVolumes := dn.getVolumes()
+	ids := make([]int, 0, len(existingVolumes))
 
-	for k := range dn.volumes {
+	for k := range existingVolumes {
 		ids = append(ids, int(k))
 	}
 
 	return util.HumanReadableIntsMax(100, ids...)
 }
+
+func (dn *DataNode) getVolumes() []storage.VolumeInfo {
+	var existingVolumes []storage.VolumeInfo
+	for _, c := range dn.children {
+		disk := c.(*Disk)
+		existingVolumes = append(existingVolumes, disk.GetVolumes()...)
+	}
+	return existingVolumes
+}
diff --git a/weed/topology/data_node_ec.go b/weed/topology/data_node_ec.go
index 75c8784fe..df1b6d658 100644
--- a/weed/topology/data_node_ec.go
+++ b/weed/topology/data_node_ec.go
@@ -3,12 +3,14 @@ package topology
 import (
 	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 )
 
 func (dn *DataNode) GetEcShards() (ret []*erasure_coding.EcVolumeInfo) {
 	dn.RLock()
-	for _, ecVolumeInfo := range dn.ecShards {
-		ret = append(ret, ecVolumeInfo)
+	for _, c := range dn.children {
+		disk := c.(*Disk)
+		ret = append(ret, disk.GetEcShards()...)
 	}
 	dn.RUnlock()
 	return ret
@@ -21,10 +23,17 @@ func (dn *DataNode) UpdateEcShards(actualShards []*erasure_coding.EcVolumeInfo)
 		actualEcShardMap[ecShards.VolumeId] = ecShards
 	}
 
+	existingEcShards := dn.GetEcShards()
+
 	// found out the newShards and deletedShards
 	var newShardCount, deletedShardCount int
-	dn.ecShardsLock.RLock()
-	for vid, ecShards := range dn.ecShards {
+	for _, ecShards := range existingEcShards {
+
+		disk := dn.getOrCreateDisk(ecShards.DiskType)
+		deltaDiskUsages := newDiskUsages()
+		deltaDiskUsage := deltaDiskUsages.getOrCreateDisk(types.ToDiskType(ecShards.DiskType))
+
+		vid := ecShards.VolumeId
 		if actualEcShards, ok := actualEcShardMap[vid]; !ok {
 			// dn registered ec shards not found in the new set of ec shards
 			deletedShards = append(deletedShards, ecShards)
@@ -42,26 +51,61 @@ func (dn *DataNode) UpdateEcShards(actualShards []*erasure_coding.EcVolumeInfo)
 				deletedShardCount += d.ShardIdCount()
 			}
 		}
+
+		deltaDiskUsage.ecShardCount = int64(newShardCount - deletedShardCount)
+		disk.UpAdjustDiskUsageDelta(deltaDiskUsages)
+
 	}
 	for _, ecShards := range actualShards {
-		if _, found := dn.ecShards[ecShards.VolumeId]; !found {
+
+		disk := dn.getOrCreateDisk(ecShards.DiskType)
+		deltaDiskUsages := newDiskUsages()
+		deltaDiskUsage := deltaDiskUsages.getOrCreateDisk(types.ToDiskType(ecShards.DiskType))
+
+		if !dn.hasEcShards(ecShards.VolumeId) {
 			newShards = append(newShards, ecShards)
 			newShardCount += ecShards.ShardIdCount()
 		}
+
+		deltaDiskUsage.ecShardCount = int64(newShardCount)
+		disk.UpAdjustDiskUsageDelta(deltaDiskUsages)
+
 	}
-	dn.ecShardsLock.RUnlock()
 
 	if len(newShards) > 0 || len(deletedShards) > 0 {
 		// if changed, set to the new ec shard map
-		dn.ecShardsLock.Lock()
-		dn.ecShards = actualEcShardMap
-		dn.UpAdjustEcShardCountDelta(int64(newShardCount - deletedShardCount))
-		dn.ecShardsLock.Unlock()
+		dn.doUpdateEcShards(actualShards)
 	}
 
 	return
 }
 
+func (dn *DataNode) hasEcShards(volumeId needle.VolumeId) (found bool) {
+	dn.RLock()
+	defer dn.RUnlock()
+	for _, c := range dn.children {
+		disk := c.(*Disk)
+		_, found = disk.ecShards[volumeId]
+		if found {
+			return
+		}
+	}
+	return
+}
+
+func (dn *DataNode) doUpdateEcShards(actualShards []*erasure_coding.EcVolumeInfo) {
+	dn.Lock()
+	for _, c := range dn.children {
+		disk := c.(*Disk)
+		disk.ecShards = make(map[needle.VolumeId]*erasure_coding.EcVolumeInfo)
+	}
+	for _, shard := range actualShards {
+		disk := dn.getOrCreateDisk(shard.DiskType)
+		disk.ecShards[shard.VolumeId] = shard
+	}
+	dn.Unlock()
+}
+
 func (dn *DataNode) DeltaUpdateEcShards(newShards, deletedShards []*erasure_coding.EcVolumeInfo) {
 
 	for _, newShard := range newShards {
@@ -75,61 +119,25 @@ func (dn *DataNode) DeltaUpdateEcShards(newShards, deletedShards []*erasure_codi
 }
 
 func (dn *DataNode) AddOrUpdateEcShard(s *erasure_coding.EcVolumeInfo) {
-	dn.ecShardsLock.Lock()
-	defer dn.ecShardsLock.Unlock()
-
-	delta := 0
-	if existing, ok := dn.ecShards[s.VolumeId]; !ok {
-		dn.ecShards[s.VolumeId] = s
-		delta = s.ShardBits.ShardIdCount()
-	} else {
-		oldCount := existing.ShardBits.ShardIdCount()
-		existing.ShardBits = existing.ShardBits.Plus(s.ShardBits)
-		delta = existing.ShardBits.ShardIdCount() - oldCount
-	}
-
-	dn.UpAdjustEcShardCountDelta(int64(delta))
-
+	disk := dn.getOrCreateDisk(s.DiskType)
+	disk.AddOrUpdateEcShard(s)
 }
 
 func (dn *DataNode) DeleteEcShard(s *erasure_coding.EcVolumeInfo) {
-	dn.ecShardsLock.Lock()
-	defer dn.ecShardsLock.Unlock()
-
-	if existing, ok := dn.ecShards[s.VolumeId]; ok {
-		oldCount := existing.ShardBits.ShardIdCount()
-		existing.ShardBits = existing.ShardBits.Minus(s.ShardBits)
-		delta := existing.ShardBits.ShardIdCount() - oldCount
-		dn.UpAdjustEcShardCountDelta(int64(delta))
-		if existing.ShardBits.ShardIdCount() == 0 {
-			delete(dn.ecShards, s.VolumeId)
-		}
-	}
-
+	disk := dn.getOrCreateDisk(s.DiskType)
+	disk.DeleteEcShard(s)
 }
 
-func (dn *DataNode) HasVolumesById(id needle.VolumeId) (hasVolumeId bool) {
+func (dn *DataNode) HasVolumesById(volumeId needle.VolumeId) (hasVolumeId bool) {
 
-	// check whether normal volumes has this volume id
 	dn.RLock()
-	_, ok := dn.volumes[id]
-	if ok {
-		hasVolumeId = true
-	}
-	dn.RUnlock()
-
-	if hasVolumeId {
-		return
-	}
-
-	// check whether ec shards has this volume id
-	dn.ecShardsLock.RLock()
-	_, ok = dn.ecShards[id]
-	if ok {
-		hasVolumeId = true
+	defer dn.RUnlock()
+	for _, c := range dn.children {
+		disk := c.(*Disk)
+		if disk.HasVolumesById(volumeId) {
+			return true
+		}
 	}
-	dn.ecShardsLock.RUnlock()
-
-	return
+	return false
 
 }
diff --git a/weed/topology/disk.go b/weed/topology/disk.go
new file mode 100644
index 000000000..c159c4cca
--- /dev/null
+++ b/weed/topology/disk.go
@@ -0,0 +1,289 @@
+package topology
+
+import (
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"sync"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+
+	"github.com/chrislusf/seaweedfs/weed/storage"
+)
+
+type Disk struct {
+	NodeImpl
+	volumes      map[needle.VolumeId]storage.VolumeInfo
+	ecShards     map[needle.VolumeId]*erasure_coding.EcVolumeInfo
+	ecShardsLock sync.RWMutex
+}
+
+func NewDisk(diskType string) *Disk {
+	s := &Disk{}
+	s.id = NodeId(diskType)
+	s.nodeType = "Disk"
+	s.diskUsages = newDiskUsages()
+	s.volumes = make(map[needle.VolumeId]storage.VolumeInfo, 2)
+	s.ecShards = make(map[needle.VolumeId]*erasure_coding.EcVolumeInfo, 2)
+	s.NodeImpl.value = s
+	return s
+}
+
+type DiskUsages struct {
+	sync.RWMutex
+	usages map[types.DiskType]*DiskUsageCounts
+}
+
+func newDiskUsages() *DiskUsages {
+	return &DiskUsages{
+		usages: make(map[types.DiskType]*DiskUsageCounts),
+	}
+}
+
+func (d *DiskUsages) negative() *DiskUsages {
+	d.RLock()
+	defer d.RUnlock()
+	t := newDiskUsages()
+	for diskType, b := range d.usages {
+		a := t.getOrCreateDisk(diskType)
+		a.volumeCount = - b.volumeCount
+		a.remoteVolumeCount = - b.remoteVolumeCount
+		a.activeVolumeCount = - b.activeVolumeCount
+		a.ecShardCount = - b.ecShardCount
+		a.maxVolumeCount = - b.maxVolumeCount
+
+	}
+	return t
+}
+
+func (d *DiskUsages) ToMap() interface{} {
+	d.RLock()
+	defer d.RUnlock()
+	ret := make(map[string]interface{})
+	for diskType, diskUsage := range d.usages {
+		ret[diskType.String()] = diskUsage.ToMap()
+	}
+	return ret
+}
+
+func (d *DiskUsages) ToDiskInfo() (map[string]*master_pb.DiskInfo) {
+	ret := make(map[string]*master_pb.DiskInfo)
+	for diskType, diskUsageCounts := range d.usages {
+		m := &master_pb.DiskInfo{
+			VolumeCount:       uint64(diskUsageCounts.volumeCount),
+			MaxVolumeCount:    uint64(diskUsageCounts.maxVolumeCount),
+			FreeVolumeCount:   uint64(diskUsageCounts.maxVolumeCount - diskUsageCounts.volumeCount),
+			ActiveVolumeCount: uint64(diskUsageCounts.activeVolumeCount),
+			RemoteVolumeCount: uint64(diskUsageCounts.remoteVolumeCount),
+		}
+		ret[string(diskType)] = m
+	}
+	return ret
+}
+
+func (d *DiskUsages) FreeSpace() (freeSpace int64) {
+	d.RLock()
+	defer d.RUnlock()
+	for _, diskUsage := range d.usages {
+		freeSpace += diskUsage.FreeSpace()
+	}
+	return
+}
+
+func (d *DiskUsages) GetMaxVolumeCount() (maxVolumeCount int64) {
+	d.RLock()
+	defer d.RUnlock()
+	for _, diskUsage := range d.usages {
+		maxVolumeCount += diskUsage.maxVolumeCount
+	}
+	return
+}
+
+type DiskUsageCounts struct {
+	volumeCount       int64
+	remoteVolumeCount int64
+	activeVolumeCount int64
+	ecShardCount      int64
+	maxVolumeCount    int64
+}
+
+func (a *DiskUsageCounts) addDiskUsageCounts(b *DiskUsageCounts) {
+	a.volumeCount += b.volumeCount
+	a.remoteVolumeCount += b.remoteVolumeCount
+	a.activeVolumeCount += b.activeVolumeCount
+	a.ecShardCount += b.ecShardCount
+	a.maxVolumeCount += b.maxVolumeCount
+}
+
+func (a *DiskUsageCounts) FreeSpace() int64 {
+	freeVolumeSlotCount := a.maxVolumeCount + a.remoteVolumeCount - a.volumeCount
+	if a.ecShardCount > 0 {
+		freeVolumeSlotCount = freeVolumeSlotCount - a.ecShardCount/erasure_coding.DataShardsCount - 1
+	}
+	return freeVolumeSlotCount
+}
+
+func (a *DiskUsageCounts) minus(b *DiskUsageCounts) *DiskUsageCounts {
+	return &DiskUsageCounts{
+		volumeCount:       a.volumeCount - b.volumeCount,
+		remoteVolumeCount: a.remoteVolumeCount - b.remoteVolumeCount,
+		activeVolumeCount: a.activeVolumeCount - b.activeVolumeCount,
+		ecShardCount:      a.ecShardCount - b.ecShardCount,
+		maxVolumeCount:    a.maxVolumeCount - b.maxVolumeCount,
+	}
+}
+
+func (diskUsage *DiskUsageCounts) ToMap() interface{} {
+	ret := make(map[string]interface{})
+	ret["Volumes"] = diskUsage.volumeCount
+	ret["EcShards"] = diskUsage.ecShardCount
+	ret["Max"] = diskUsage.maxVolumeCount
+	ret["Free"] = diskUsage.FreeSpace()
+	return ret
+}
+
+func (du *DiskUsages) getOrCreateDisk(diskType types.DiskType) *DiskUsageCounts {
+	du.Lock()
+	defer du.Unlock()
+	t, found := du.usages[diskType]
+	if found {
+		return t
+	}
+	t = &DiskUsageCounts{}
+	du.usages[diskType] = t
+	return t
+}
+
+func (d *Disk) String() string {
+	d.RLock()
+	defer d.RUnlock()
+	return fmt.Sprintf("Disk:%s, volumes:%v, ecShards:%v", d.NodeImpl.String(), d.volumes, d.ecShards)
+}
+
+func (d *Disk) AddOrUpdateVolume(v storage.VolumeInfo) (isNew, isChangedRO bool) {
+	d.Lock()
+	defer d.Unlock()
+	return d.doAddOrUpdateVolume(v)
+}
+
+func (d *Disk) doAddOrUpdateVolume(v storage.VolumeInfo) (isNew, isChangedRO bool) {
+	deltaDiskUsages := newDiskUsages()
+	deltaDiskUsage := deltaDiskUsages.getOrCreateDisk(types.ToDiskType(v.DiskType))
+	if oldV, ok := d.volumes[v.Id]; !ok {
+		d.volumes[v.Id] = v
+		deltaDiskUsage.volumeCount = 1
+		if v.IsRemote() {
+			deltaDiskUsage.remoteVolumeCount = 1
+		}
+		if !v.ReadOnly {
+			deltaDiskUsage.activeVolumeCount = 1
+		}
+		d.UpAdjustMaxVolumeId(v.Id)
+		d.UpAdjustDiskUsageDelta(deltaDiskUsages)
+		isNew = true
+	} else {
+		if oldV.IsRemote() != v.IsRemote() {
+			if v.IsRemote() {
+				deltaDiskUsage.remoteVolumeCount = 1
+			}
+			if oldV.IsRemote() {
+				deltaDiskUsage.remoteVolumeCount = -1
+			}
+			d.UpAdjustDiskUsageDelta(deltaDiskUsages)
+		}
+		isChangedRO = d.volumes[v.Id].ReadOnly != v.ReadOnly
+		d.volumes[v.Id] = v
+	}
+	return
+}
+
+func (d *Disk) GetVolumes() (ret []storage.VolumeInfo) {
+	d.RLock()
+	for _, v := range d.volumes {
+		ret = append(ret, v)
+	}
+	d.RUnlock()
+	return ret
+}
+
+func (d *Disk) GetVolumesById(id needle.VolumeId) (storage.VolumeInfo, error) {
+	d.RLock()
+	defer d.RUnlock()
+	vInfo, ok := d.volumes[id]
+	if ok {
+		return vInfo, nil
+	} else {
+		return storage.VolumeInfo{}, fmt.Errorf("volumeInfo not found")
+	}
+}
+
+func (d *Disk) GetDataCenter() *DataCenter {
+	dn := d.Parent()
+	rack := dn.Parent()
+	dcNode := rack.Parent()
+	dcValue := dcNode.GetValue()
+	return dcValue.(*DataCenter)
+}
+
+func (d *Disk) GetRack() *Rack {
+	return d.Parent().Parent().(*NodeImpl).value.(*Rack)
+}
+
+func (d *Disk) GetTopology() *Topology {
+	p := d.Parent()
+	for p.Parent() != nil {
+		p = p.Parent()
+	}
+	t := p.(*Topology)
+	return t
+}
+
+func (d *Disk) ToMap() interface{} {
+	ret := make(map[string]interface{})
+	diskUsage := d.diskUsages.getOrCreateDisk(types.ToDiskType(string(d.Id())))
+	ret["Volumes"] = diskUsage.volumeCount
+	ret["VolumeIds"] = d.GetVolumeIds()
+	ret["EcShards"] = diskUsage.ecShardCount
+	ret["Max"] = diskUsage.maxVolumeCount
+	ret["Free"] = d.FreeSpace()
+	return ret
+}
+
+func (d *Disk) FreeSpace() int64 {
+	t := d.diskUsages.getOrCreateDisk(types.ToDiskType(string(d.Id())))
+	return t.FreeSpace()
+}
+
+func (d *Disk) ToDiskInfo() *master_pb.DiskInfo {
+	diskUsage := d.diskUsages.getOrCreateDisk(types.ToDiskType(string(d.Id())))
+	m := &master_pb.DiskInfo{
+		Type:              string(d.Id()),
+		VolumeCount:       uint64(diskUsage.volumeCount),
+		MaxVolumeCount:    uint64(diskUsage.maxVolumeCount),
+		FreeVolumeCount:   uint64(diskUsage.maxVolumeCount - diskUsage.volumeCount),
+		ActiveVolumeCount: uint64(diskUsage.activeVolumeCount),
+		RemoteVolumeCount: uint64(diskUsage.remoteVolumeCount),
+	}
+	for _, v := range d.GetVolumes() {
+		m.VolumeInfos = append(m.VolumeInfos, v.ToVolumeInformationMessage())
+	}
+	for _, ecv := range d.GetEcShards() {
+		m.EcShardInfos = append(m.EcShardInfos, ecv.ToVolumeEcShardInformationMessage())
+	}
+	return m
+}
+
+// GetVolumeIds returns the human readable volume ids limited to count of max 100.
+func (d *Disk) GetVolumeIds() string {
+	d.RLock()
+	defer d.RUnlock()
+	ids := make([]int, 0, len(d.volumes))
+
+	for k := range d.volumes {
+		ids = append(ids, int(k))
+	}
+
+	return util.HumanReadableIntsMax(100, ids...)
+}
diff --git a/weed/topology/disk_ec.go b/weed/topology/disk_ec.go
new file mode 100644
index 000000000..74a06b47f
--- /dev/null
+++ b/weed/topology/disk_ec.go
@@ -0,0 +1,84 @@
+package topology
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+)
+
+func (d *Disk) GetEcShards() (ret []*erasure_coding.EcVolumeInfo) {
+	d.RLock()
+	for _, ecVolumeInfo := range d.ecShards {
+		ret = append(ret, ecVolumeInfo)
+	}
+	d.RUnlock()
+	return ret
+}
+
+func (d *Disk) AddOrUpdateEcShard(s *erasure_coding.EcVolumeInfo) {
+	d.ecShardsLock.Lock()
+	defer d.ecShardsLock.Unlock()
+
+	delta := 0
+	if existing, ok := d.ecShards[s.VolumeId]; !ok {
+		d.ecShards[s.VolumeId] = s
+		delta = s.ShardBits.ShardIdCount()
+	} else {
+		oldCount := existing.ShardBits.ShardIdCount()
+		existing.ShardBits = existing.ShardBits.Plus(s.ShardBits)
+		delta = existing.ShardBits.ShardIdCount() - oldCount
+	}
+
+	deltaDiskUsages := newDiskUsages()
+	deltaDiskUsage := deltaDiskUsages.getOrCreateDisk(types.ToDiskType(string(d.Id())))
+	deltaDiskUsage.ecShardCount = int64(delta)
+	d.UpAdjustDiskUsageDelta(deltaDiskUsages)
+
+}
+
+func (d *Disk) DeleteEcShard(s *erasure_coding.EcVolumeInfo) {
+	d.ecShardsLock.Lock()
+	defer d.ecShardsLock.Unlock()
+
+	if existing, ok := d.ecShards[s.VolumeId]; ok {
+		oldCount := existing.ShardBits.ShardIdCount()
+		existing.ShardBits = existing.ShardBits.Minus(s.ShardBits)
+		delta := existing.ShardBits.ShardIdCount() - oldCount
+
+		deltaDiskUsages := newDiskUsages()
+		deltaDiskUsage := deltaDiskUsages.getOrCreateDisk(types.ToDiskType(string(d.Id())))
+		deltaDiskUsage.ecShardCount = int64(delta)
+		d.UpAdjustDiskUsageDelta(deltaDiskUsages)
+
+		if existing.ShardBits.ShardIdCount() == 0 {
+			delete(d.ecShards, s.VolumeId)
+		}
+	}
+
+}
+
+func (d *Disk) HasVolumesById(id needle.VolumeId) (hasVolumeId bool) {
+
+	// check whether normal volumes has this volume id
+	d.RLock()
+	_, ok := d.volumes[id]
+	if ok {
+		hasVolumeId = true
+	}
+	d.RUnlock()
+
+	if hasVolumeId {
+		return
+	}
+
+	// check whether ec shards has this volume id
+	d.ecShardsLock.RLock()
+	_, ok = d.ecShards[id]
+	if ok {
+		hasVolumeId = true
+	}
+	d.ecShardsLock.RUnlock()
+
+	return
+
+}
diff --git a/weed/topology/node.go b/weed/topology/node.go
index b5c2680dd..f9ac890ef 100644
--- a/weed/topology/node.go
+++ b/weed/topology/node.go
@@ -2,40 +2,25 @@ package topology
 
 import (
 	"errors"
-	"github.com/chrislusf/seaweedfs/weed/storage"
-	"math/rand"
-	"strings"
-	"sync"
-	"sync/atomic"
-
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"math/rand"
+	"strings"
+	"sync"
 )
 
 type NodeId string
 type Node interface {
 	Id() NodeId
 	String() string
-	FreeSpace() int64
 	AvailableSpaceFor(option *VolumeGrowOption) int64
 	ReserveOneVolume(r int64, option *VolumeGrowOption) (*DataNode, error)
-	UpAdjustMaxVolumeCountDelta(maxVolumeCountDelta int64)
-	UpAdjustMaxSsdVolumeCountDelta(maxSsdVolumeCountDelta int64)
-	UpAdjustVolumeCountDelta(volumeCountDelta int64)
-	UpAdjustSsdVolumeCountDelta(ssdVolumeCountDelta int64)
-	UpAdjustRemoteVolumeCountDelta(remoteVolumeCountDelta int64)
-	UpAdjustEcShardCountDelta(ecShardCountDelta int64)
-	UpAdjustActiveVolumeCountDelta(activeVolumeCountDelta int64)
+	UpAdjustDiskUsageDelta(deltaDiskUsages *DiskUsages)
 	UpAdjustMaxVolumeId(vid needle.VolumeId)
+	GetDiskUsages() *DiskUsages
 
-	GetVolumeCount() int64
-	GetSsdVolumeCount() int64
-	GetEcShardCount() int64
-	GetActiveVolumeCount() int64
-	GetRemoteVolumeCount() int64
-	GetMaxVolumeCount() int64
-	GetMaxSsdVolumeCount() int64
 	GetMaxVolumeId() needle.VolumeId
 	SetParent(Node)
 	LinkChildNode(node Node)
@@ -51,24 +36,22 @@ type Node interface {
 	GetValue() interface{} //get reference to the topology,dc,rack,datanode
 }
 type NodeImpl struct {
-	volumeCount       int64
-	remoteVolumeCount int64
-	ssdVolumeCount    int64
-	activeVolumeCount int64
-	ecShardCount      int64
-	maxVolumeCount    int64
-	maxSsdVolumeCount int64
-	id                NodeId
-	parent            Node
-	sync.RWMutex      // lock children
-	children          map[NodeId]Node
-	maxVolumeId       needle.VolumeId
+	diskUsages   *DiskUsages
+	id           NodeId
+	parent       Node
+	sync.RWMutex     // lock children
+	children     map[NodeId]Node
+	maxVolumeId  needle.VolumeId
 
 	//for rack, data center, topology
 	nodeType string
 	value    interface{}
 }
 
+func (n *NodeImpl) GetDiskUsages() *DiskUsages {
+	return n.diskUsages
+}
+
 // the first node must satisfy filterFirstNodeFn(), the rest nodes must have one free slot
 func (n *NodeImpl) PickNodesByWeight(numberOfNodes int, option *VolumeGrowOption, filterFirstNodeFn func(dn Node) error) (firstNode Node, restNodes []Node, err error) {
 	var totalWeights int64
@@ -150,20 +133,14 @@ func (n *NodeImpl) String() string {
 func (n *NodeImpl) Id() NodeId {
 	return n.id
 }
-func (n *NodeImpl) AvailableSpaceFor(option *VolumeGrowOption) int64 {
-	freeVolumeSlotCount := n.maxVolumeCount + n.remoteVolumeCount - n.volumeCount
-	if option.DiskType == storage.SsdType {
-		freeVolumeSlotCount = n.maxSsdVolumeCount - n.ssdVolumeCount
-	}
-	if n.ecShardCount > 0 {
-		freeVolumeSlotCount = freeVolumeSlotCount - n.ecShardCount/erasure_coding.DataShardsCount - 1
-	}
-	return freeVolumeSlotCount
+func (n *NodeImpl) getOrCreateDisk(diskType types.DiskType) *DiskUsageCounts {
+	return n.diskUsages.getOrCreateDisk(diskType)
 }
-func (n *NodeImpl) FreeSpace() int64 {
-	freeVolumeSlotCount := n.maxVolumeCount + n.maxSsdVolumeCount + n.remoteVolumeCount - n.volumeCount - n.ssdVolumeCount
-	if n.ecShardCount > 0 {
-		freeVolumeSlotCount = freeVolumeSlotCount - n.ecShardCount/erasure_coding.DataShardsCount - 1
+func (n *NodeImpl) AvailableSpaceFor(option *VolumeGrowOption) int64 {
+	t := n.getOrCreateDisk(option.DiskType)
+	freeVolumeSlotCount := t.maxVolumeCount + t.remoteVolumeCount - t.volumeCount
+	if t.ecShardCount > 0 {
+		freeVolumeSlotCount = freeVolumeSlotCount - t.ecShardCount/erasure_coding.DataShardsCount - 1
 	}
 	return freeVolumeSlotCount
 }
@@ -209,67 +186,13 @@ func (n *NodeImpl) ReserveOneVolume(r int64, option *VolumeGrowOption) (assigned
 	return nil, errors.New("No free volume slot found!")
 }
 
-func (n *NodeImpl) UpAdjustMaxVolumeCountDelta(maxVolumeCountDelta int64) { //can be negative
-	if maxVolumeCountDelta == 0 {
-		return
-	}
-	atomic.AddInt64(&n.maxVolumeCount, maxVolumeCountDelta)
-	if n.parent != nil {
-		n.parent.UpAdjustMaxVolumeCountDelta(maxVolumeCountDelta)
-	}
-}
-func (n *NodeImpl) UpAdjustMaxSsdVolumeCountDelta(maxSsdVolumeCountDelta int64) { //can be negative
-	if maxSsdVolumeCountDelta == 0 {
-		return
+func (n *NodeImpl) UpAdjustDiskUsageDelta(deltaDiskUsages *DiskUsages) { //can be negative
+	for diskType, diskUsage := range deltaDiskUsages.usages {
+		existingDisk := n.getOrCreateDisk(diskType)
+		existingDisk.addDiskUsageCounts(diskUsage)
 	}
-	atomic.AddInt64(&n.maxSsdVolumeCount, maxSsdVolumeCountDelta)
 	if n.parent != nil {
-		n.parent.UpAdjustMaxSsdVolumeCountDelta(maxSsdVolumeCountDelta)
-	}
-}
-func (n *NodeImpl) UpAdjustVolumeCountDelta(volumeCountDelta int64) { //can be negative
-	if volumeCountDelta == 0 {
-		return
-	}
-	atomic.AddInt64(&n.volumeCount, volumeCountDelta)
-	if n.parent != nil {
-		n.parent.UpAdjustVolumeCountDelta(volumeCountDelta)
-	}
-}
-func (n *NodeImpl) UpAdjustRemoteVolumeCountDelta(remoteVolumeCountDelta int64) { //can be negative
-	if remoteVolumeCountDelta == 0 {
-		return
-	}
-	atomic.AddInt64(&n.remoteVolumeCount, remoteVolumeCountDelta)
-	if n.parent != nil {
-		n.parent.UpAdjustRemoteVolumeCountDelta(remoteVolumeCountDelta)
-	}
-}
-func (n *NodeImpl) UpAdjustSsdVolumeCountDelta(ssdVolumeCountDelta int64) { //can be negative
-	if ssdVolumeCountDelta == 0 {
-		return
-	}
-	atomic.AddInt64(&n.ssdVolumeCount, ssdVolumeCountDelta)
-	if n.parent != nil {
-		n.parent.UpAdjustSsdVolumeCountDelta(ssdVolumeCountDelta)
-	}
-}
-func (n *NodeImpl) UpAdjustEcShardCountDelta(ecShardCountDelta int64) { //can be negative
-	if ecShardCountDelta == 0 {
-		return
-	}
-	atomic.AddInt64(&n.ecShardCount, ecShardCountDelta)
-	if n.parent != nil {
-		n.parent.UpAdjustEcShardCountDelta(ecShardCountDelta)
-	}
-}
-func (n *NodeImpl) UpAdjustActiveVolumeCountDelta(activeVolumeCountDelta int64) { //can be negative
-	if activeVolumeCountDelta == 0 {
-		return
-	}
-	atomic.AddInt64(&n.activeVolumeCount, activeVolumeCountDelta)
-	if n.parent != nil {
-		n.parent.UpAdjustActiveVolumeCountDelta(activeVolumeCountDelta)
+		n.parent.UpAdjustDiskUsageDelta(deltaDiskUsages)
 	}
 }
 func (n *NodeImpl) UpAdjustMaxVolumeId(vid needle.VolumeId) { //can be negative
@@ -283,41 +206,18 @@ func (n *NodeImpl) UpAdjustMaxVolumeId(vid needle.VolumeId) { //can be negative
 func (n *NodeImpl) GetMaxVolumeId() needle.VolumeId {
 	return n.maxVolumeId
 }
-func (n *NodeImpl) GetVolumeCount() int64 {
-	return n.volumeCount
-}
-func (n *NodeImpl) GetSsdVolumeCount() int64 {
-	return n.ssdVolumeCount
-}
-func (n *NodeImpl) GetEcShardCount() int64 {
-	return n.ecShardCount
-}
-func (n *NodeImpl) GetRemoteVolumeCount() int64 {
-	return n.remoteVolumeCount
-}
-func (n *NodeImpl) GetActiveVolumeCount() int64 {
-	return n.activeVolumeCount
-}
-func (n *NodeImpl) GetMaxVolumeCount() int64 {
-	return n.maxVolumeCount
-}
-func (n *NodeImpl) GetMaxSsdVolumeCount() int64 {
-	return n.maxSsdVolumeCount
-}
 
 func (n *NodeImpl) LinkChildNode(node Node) {
 	n.Lock()
 	defer n.Unlock()
+	n.doLinkChildNode(node)
+}
+
+func (n *NodeImpl) doLinkChildNode(node Node) {
 	if n.children[node.Id()] == nil {
 		n.children[node.Id()] = node
-		n.UpAdjustMaxVolumeCountDelta(node.GetMaxVolumeCount())
-		n.UpAdjustMaxSsdVolumeCountDelta(node.GetMaxSsdVolumeCount())
+		n.UpAdjustDiskUsageDelta(node.GetDiskUsages())
 		n.UpAdjustMaxVolumeId(node.GetMaxVolumeId())
-		n.UpAdjustVolumeCountDelta(node.GetVolumeCount())
-		n.UpAdjustSsdVolumeCountDelta(node.GetSsdVolumeCount())
-		n.UpAdjustRemoteVolumeCountDelta(node.GetRemoteVolumeCount())
-		n.UpAdjustEcShardCountDelta(node.GetEcShardCount())
-		n.UpAdjustActiveVolumeCountDelta(node.GetActiveVolumeCount())
 		node.SetParent(n)
 		glog.V(0).Infoln(n, "adds child", node.Id())
 	}
@@ -330,13 +230,7 @@ func (n *NodeImpl) UnlinkChildNode(nodeId NodeId) {
 	if node != nil {
 		node.SetParent(nil)
 		delete(n.children, node.Id())
-		n.UpAdjustVolumeCountDelta(-node.GetVolumeCount())
-		n.UpAdjustSsdVolumeCountDelta(-node.GetSsdVolumeCount())
-		n.UpAdjustRemoteVolumeCountDelta(-node.GetRemoteVolumeCount())
-		n.UpAdjustEcShardCountDelta(-node.GetEcShardCount())
-		n.UpAdjustActiveVolumeCountDelta(-node.GetActiveVolumeCount())
-		n.UpAdjustMaxVolumeCountDelta(-node.GetMaxVolumeCount())
-		n.UpAdjustMaxSsdVolumeCountDelta(-node.GetMaxSsdVolumeCount())
+		n.UpAdjustDiskUsageDelta(node.GetDiskUsages().negative())
 		glog.V(0).Infoln(n, "removes", node.Id())
 	}
 }
diff --git a/weed/topology/rack.go b/weed/topology/rack.go
index 35563abe5..8eb2a717c 100644
--- a/weed/topology/rack.go
+++ b/weed/topology/rack.go
@@ -2,6 +2,7 @@ package topology
 
 import (
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"strconv"
 	"time"
 )
@@ -14,6 +15,7 @@ func NewRack(id string) *Rack {
 	r := &Rack{}
 	r.id = NodeId(id)
 	r.nodeType = "Rack"
+	r.diskUsages = newDiskUsages()
 	r.children = make(map[NodeId]Node)
 	r.NodeImpl.value = r
 	return r
@@ -28,7 +30,7 @@ func (r *Rack) FindDataNode(ip string, port int) *DataNode {
 	}
 	return nil
 }
-func (r *Rack) GetOrCreateDataNode(ip string, port int, publicUrl string, maxVolumeCount int64, maxSsdVolumeCount int64) *DataNode {
+func (r *Rack) GetOrCreateDataNode(ip string, port int, publicUrl string, maxVolumeCounts map[string]uint32) *DataNode {
 	for _, c := range r.Children() {
 		dn := c.(*DataNode)
 		if dn.MatchLocation(ip, port) {
@@ -40,19 +42,19 @@ func (r *Rack) GetOrCreateDataNode(ip string, port int, publicUrl string, maxVol
 	dn.Ip = ip
 	dn.Port = port
 	dn.PublicUrl = publicUrl
-	dn.maxVolumeCount = maxVolumeCount
-	dn.maxSsdVolumeCount = maxSsdVolumeCount
 	dn.LastSeen = time.Now().Unix()
 	r.LinkChildNode(dn)
+	for diskType, maxVolumeCount := range maxVolumeCounts {
+		disk := NewDisk(diskType)
+		disk.diskUsages.getOrCreateDisk(types.ToDiskType(diskType)).maxVolumeCount = int64(maxVolumeCount)
+		dn.LinkChildNode(disk)
+	}
 	return dn
 }
 
 func (r *Rack) ToMap() interface{} {
 	m := make(map[string]interface{})
 	m["Id"] = r.Id()
-	m["Max"] = r.GetMaxVolumeCount()
-	m["MaxSsd"] = r.GetMaxSsdVolumeCount()
-	m["Free"] = r.FreeSpace()
 	var dns []interface{}
 	for _, c := range r.Children() {
 		dn := c.(*DataNode)
@@ -64,14 +66,8 @@ func (r *Rack) ToMap() interface{} {
 
 func (r *Rack) ToRackInfo() *master_pb.RackInfo {
 	m := &master_pb.RackInfo{
-		Id:                string(r.Id()),
-		VolumeCount:       uint64(r.GetVolumeCount()),
-		MaxVolumeCount:    uint64(r.GetMaxVolumeCount()),
-		MaxSsdVolumeCount: uint64(r.GetMaxSsdVolumeCount()),
-		SsdVolumeCount:    uint64(r.GetSsdVolumeCount()),
-		FreeVolumeCount:   uint64(r.FreeSpace()),
-		ActiveVolumeCount: uint64(r.GetActiveVolumeCount()),
-		RemoteVolumeCount: uint64(r.GetRemoteVolumeCount()),
+		Id:        string(r.Id()),
+		DiskInfos: r.diskUsages.ToDiskInfo(),
 	}
 	for _, c := range r.Children() {
 		dn := c.(*DataNode)
diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index 220be4e88..08ebd24fd 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -3,6 +3,7 @@ package topology
 import (
 	"errors"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"math/rand"
 	"sync"
 	"time"
@@ -45,6 +46,7 @@ func NewTopology(id string, seq sequence.Sequencer, volumeSizeLimit uint64, puls
 	t.id = NodeId(id)
 	t.nodeType = "Topology"
 	t.NodeImpl.value = t
+	t.diskUsages = newDiskUsages()
 	t.children = make(map[NodeId]Node)
 	t.collectionMap = util.NewConcurrentReadMap()
 	t.ecShardMap = make(map[needle.VolumeId]*EcShardLocations)
@@ -137,7 +139,7 @@ func (t *Topology) PickForWrite(count uint64, option *VolumeGrowOption) (string,
 	return needle.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
 }
 
-func (t *Topology) GetVolumeLayout(collectionName string, rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType storage.DiskType) *VolumeLayout {
+func (t *Topology) GetVolumeLayout(collectionName string, rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType types.DiskType) *VolumeLayout {
 	return t.collectionMap.Get(collectionName, func() interface{} {
 		return NewCollection(collectionName, t.volumeSizeLimit, t.replicationAsMin)
 	}).(*Collection).GetOrCreateVolumeLayout(rp, ttl, diskType)
@@ -176,7 +178,7 @@ func (t *Topology) DeleteCollection(collectionName string) {
 	t.collectionMap.Delete(collectionName)
 }
 
-func (t *Topology) DeleteLayout(collectionName string, rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType storage.DiskType) {
+func (t *Topology) DeleteLayout(collectionName string, rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType types.DiskType) {
 	collection, found := t.FindCollection(collectionName)
 	if !found {
 		return
@@ -188,14 +190,14 @@ func (t *Topology) DeleteLayout(collectionName string, rp *super_block.ReplicaPl
 }
 
 func (t *Topology) RegisterVolumeLayout(v storage.VolumeInfo, dn *DataNode) {
-	diskType := storage.ToDiskType(v.DiskType)
+	diskType := types.ToDiskType(v.DiskType)
 	vl := t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl, diskType)
 	vl.RegisterVolume(&v, dn)
 	vl.EnsureCorrectWritables(&v)
 }
 func (t *Topology) UnRegisterVolumeLayout(v storage.VolumeInfo, dn *DataNode) {
 	glog.Infof("removing volume info: %+v", v)
-	diskType := storage.ToDiskType(v.DiskType)
+	diskType := types.ToDiskType(v.DiskType)
 	volumeLayout := t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl, diskType)
 	volumeLayout.UnRegisterVolume(&v, dn)
 	if volumeLayout.isEmpty() {
@@ -235,7 +237,7 @@ func (t *Topology) SyncDataNodeRegistration(volumes []*master_pb.VolumeInformati
 		t.UnRegisterVolumeLayout(v, dn)
 	}
 	for _, v := range changedVolumes {
-		diskType := storage.ToDiskType(v.DiskType)
+		diskType := types.ToDiskType(v.DiskType)
 		vl := t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl, diskType)
 		vl.EnsureCorrectWritables(&v)
 	}
diff --git a/weed/topology/topology_ec.go b/weed/topology/topology_ec.go
index 93b39bb5d..022eeb578 100644
--- a/weed/topology/topology_ec.go
+++ b/weed/topology/topology_ec.go
@@ -18,6 +18,7 @@ func (t *Topology) SyncDataNodeEcShards(shardInfos []*master_pb.VolumeEcShardInf
 	for _, shardInfo := range shardInfos {
 		shards = append(shards,
 			erasure_coding.NewEcVolumeInfo(
+				shardInfo.DiskType,
 				shardInfo.Collection,
 				needle.VolumeId(shardInfo.Id),
 				erasure_coding.ShardBits(shardInfo.EcIndexBits)))
@@ -39,6 +40,7 @@ func (t *Topology) IncrementalSyncDataNodeEcShards(newEcShards, deletedEcShards
 	for _, shardInfo := range newEcShards {
 		newShards = append(newShards,
 			erasure_coding.NewEcVolumeInfo(
+				shardInfo.DiskType,
 				shardInfo.Collection,
 				needle.VolumeId(shardInfo.Id),
 				erasure_coding.ShardBits(shardInfo.EcIndexBits)))
@@ -46,6 +48,7 @@ func (t *Topology) IncrementalSyncDataNodeEcShards(newEcShards, deletedEcShards
 	for _, shardInfo := range deletedEcShards {
 		deletedShards = append(deletedShards,
 			erasure_coding.NewEcVolumeInfo(
+				shardInfo.DiskType,
 				shardInfo.Collection,
 				needle.VolumeId(shardInfo.Id),
 				erasure_coding.ShardBits(shardInfo.EcIndexBits)))
diff --git a/weed/topology/topology_event_handling.go b/weed/topology/topology_event_handling.go
index d4076af5d..543dacf29 100644
--- a/weed/topology/topology_event_handling.go
+++ b/weed/topology/topology_event_handling.go
@@ -1,6 +1,7 @@
 package topology
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"google.golang.org/grpc"
 	"math/rand"
 	"time"
@@ -37,7 +38,7 @@ func (t *Topology) StartRefreshWritableVolumes(grpcDialOption grpc.DialOption, g
 	}()
 }
 func (t *Topology) SetVolumeCapacityFull(volumeInfo storage.VolumeInfo) bool {
-	diskType := storage.ToDiskType(volumeInfo.DiskType)
+	diskType := types.ToDiskType(volumeInfo.DiskType)
 	vl := t.GetVolumeLayout(volumeInfo.Collection, volumeInfo.ReplicaPlacement, volumeInfo.Ttl, diskType)
 	if !vl.SetVolumeCapacityFull(volumeInfo.Id) {
 		return false
@@ -48,7 +49,13 @@ func (t *Topology) SetVolumeCapacityFull(volumeInfo storage.VolumeInfo) bool {
 
 	for _, dn := range vl.vid2location[volumeInfo.Id].list {
 		if !volumeInfo.ReadOnly {
-			dn.UpAdjustActiveVolumeCountDelta(-1)
+
+			disk := dn.getOrCreateDisk(volumeInfo.DiskType)
+			deltaDiskUsages := newDiskUsages()
+			deltaDiskUsage := deltaDiskUsages.getOrCreateDisk(types.ToDiskType(volumeInfo.DiskType))
+			deltaDiskUsage.activeVolumeCount = -1
+			disk.UpAdjustDiskUsageDelta(deltaDiskUsages)
+
 		}
 	}
 	return true
@@ -56,16 +63,14 @@ func (t *Topology) SetVolumeCapacityFull(volumeInfo storage.VolumeInfo) bool {
 func (t *Topology) UnRegisterDataNode(dn *DataNode) {
 	for _, v := range dn.GetVolumes() {
 		glog.V(0).Infoln("Removing Volume", v.Id, "from the dead volume server", dn.Id())
-		diskType := storage.ToDiskType(v.DiskType)
+		diskType := types.ToDiskType(v.DiskType)
 		vl := t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl, diskType)
 		vl.SetVolumeUnavailable(dn, v.Id)
 	}
-	dn.UpAdjustVolumeCountDelta(-dn.GetVolumeCount())
-	dn.UpAdjustSsdVolumeCountDelta(-dn.GetSsdVolumeCount())
-	dn.UpAdjustRemoteVolumeCountDelta(-dn.GetRemoteVolumeCount())
-	dn.UpAdjustActiveVolumeCountDelta(-dn.GetActiveVolumeCount())
-	dn.UpAdjustMaxVolumeCountDelta(-dn.GetMaxVolumeCount())
-	dn.UpAdjustMaxSsdVolumeCountDelta(-dn.GetMaxSsdVolumeCount())
+
+	negativeUsages := dn.GetDiskUsages().negative()
+	dn.UpAdjustDiskUsageDelta(negativeUsages)
+
 	if dn.Parent() != nil {
 		dn.Parent().UnlinkChildNode(dn.Id())
 	}
diff --git a/weed/topology/topology_map.go b/weed/topology/topology_map.go
index 566fa418f..0fedb6221 100644
--- a/weed/topology/topology_map.go
+++ b/weed/topology/topology_map.go
@@ -4,8 +4,8 @@ import "github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 
 func (t *Topology) ToMap() interface{} {
 	m := make(map[string]interface{})
-	m["Max"] = t.GetMaxVolumeCount() + t.GetMaxSsdVolumeCount()
-	m["Free"] = t.FreeSpace()
+	m["Max"] = t.diskUsages.GetMaxVolumeCount()
+	m["Free"] = t.diskUsages.FreeSpace()
 	var dcs []interface{}
 	for _, c := range t.Children() {
 		dc := c.(*DataCenter)
@@ -29,8 +29,8 @@ func (t *Topology) ToMap() interface{} {
 
 func (t *Topology) ToVolumeMap() interface{} {
 	m := make(map[string]interface{})
-	m["Max"] = t.GetMaxVolumeCount() + t.GetMaxSsdVolumeCount()
-	m["Free"] = t.FreeSpace()
+	m["Max"] = t.diskUsages.GetMaxVolumeCount()
+	m["Free"] = t.diskUsages.FreeSpace()
 	dcs := make(map[NodeId]interface{})
 	for _, c := range t.Children() {
 		dc := c.(*DataCenter)
@@ -80,14 +80,8 @@ func (t *Topology) ToVolumeLocations() (volumeLocations []*master_pb.VolumeLocat
 
 func (t *Topology) ToTopologyInfo() *master_pb.TopologyInfo {
 	m := &master_pb.TopologyInfo{
-		Id:                string(t.Id()),
-		VolumeCount:       uint64(t.GetVolumeCount()),
-		MaxVolumeCount:    uint64(t.GetMaxVolumeCount()),
-		MaxSsdVolumeCount: uint64(t.GetMaxSsdVolumeCount()),
-		FreeVolumeCount:   uint64(t.FreeSpace()),
-		ActiveVolumeCount: uint64(t.GetActiveVolumeCount()),
-		RemoteVolumeCount: uint64(t.GetRemoteVolumeCount()),
-		SsdVolumeCount:    uint64(t.GetSsdVolumeCount()),
+		Id:        string(t.Id()),
+		DiskInfos: t.diskUsages.ToDiskInfo(),
 	}
 	for _, c := range t.Children() {
 		dc := c.(*DataCenter)
diff --git a/weed/topology/topology_test.go b/weed/topology/topology_test.go
index b7088947c..ecfe9d8d1 100644
--- a/weed/topology/topology_test.go
+++ b/weed/topology/topology_test.go
@@ -6,6 +6,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 
 	"testing"
 )
@@ -13,11 +14,11 @@ import (
 func TestRemoveDataCenter(t *testing.T) {
 	topo := setup(topologyLayout)
 	topo.UnlinkChildNode(NodeId("dc2"))
-	if topo.GetActiveVolumeCount() != 15 {
+	if topo.diskUsages.usages[types.HardDriveType].activeVolumeCount != 15 {
 		t.Fail()
 	}
 	topo.UnlinkChildNode(NodeId("dc3"))
-	if topo.GetActiveVolumeCount() != 12 {
+	if topo.diskUsages.usages[types.HardDriveType].activeVolumeCount != 12 {
 		t.Fail()
 	}
 }
@@ -27,7 +28,10 @@ func TestHandlingVolumeServerHeartbeat(t *testing.T) {
 
 	dc := topo.GetOrCreateDataCenter("dc1")
 	rack := dc.GetOrCreateRack("rack1")
-	dn := rack.GetOrCreateDataNode("127.0.0.1", 34534, "127.0.0.1", 25, 12)
+	maxVolumeCounts := make(map[string]uint32)
+	maxVolumeCounts[""] = 25
+	maxVolumeCounts["ssd"] = 12
+	dn := rack.GetOrCreateDataNode("127.0.0.1", 34534, "127.0.0.1", maxVolumeCounts)
 
 	{
 		volumeCount := 7
@@ -67,9 +71,11 @@ func TestHandlingVolumeServerHeartbeat(t *testing.T) {
 
 		topo.SyncDataNodeRegistration(volumeMessages, dn)
 
-		assert(t, "activeVolumeCount1", int(topo.activeVolumeCount), volumeCount*2)
-		assert(t, "volumeCount", int(topo.volumeCount), volumeCount)
-		assert(t, "ssdVolumeCount", int(topo.ssdVolumeCount), volumeCount)
+		usageCounts := topo.diskUsages.usages[types.HardDriveType]
+
+		assert(t, "activeVolumeCount1", int(usageCounts.activeVolumeCount), volumeCount)
+		assert(t, "volumeCount", int(usageCounts.volumeCount), volumeCount)
+		assert(t, "ssdVolumeCount", int(topo.diskUsages.usages[types.SsdType].volumeCount), volumeCount)
 	}
 
 	{
@@ -96,8 +102,10 @@ func TestHandlingVolumeServerHeartbeat(t *testing.T) {
 		//layout := topo.GetVolumeLayout("", rp, needle.EMPTY_TTL)
 		//assert(t, "writables", len(layout.writables), volumeCount)
 
-		assert(t, "activeVolumeCount1", int(topo.activeVolumeCount), volumeCount)
-		assert(t, "volumeCount", int(topo.volumeCount), volumeCount)
+		usageCounts := topo.diskUsages.usages[types.HardDriveType]
+
+		assert(t, "activeVolumeCount1", int(usageCounts.activeVolumeCount), volumeCount)
+		assert(t, "volumeCount", int(usageCounts.volumeCount), volumeCount)
 	}
 
 	{
@@ -114,19 +122,21 @@ func TestHandlingVolumeServerHeartbeat(t *testing.T) {
 			nil,
 			dn)
 		rp, _ := super_block.NewReplicaPlacementFromString("000")
-		layout := topo.GetVolumeLayout("", rp, needle.EMPTY_TTL, storage.HardDriveType)
+		layout := topo.GetVolumeLayout("", rp, needle.EMPTY_TTL, types.HardDriveType)
 		assert(t, "writables after repeated add", len(layout.writables), volumeCount)
 
-		assert(t, "activeVolumeCount1", int(topo.activeVolumeCount), volumeCount)
-		assert(t, "volumeCount", int(topo.volumeCount), volumeCount)
+		usageCounts := topo.diskUsages.usages[types.HardDriveType]
+
+		assert(t, "activeVolumeCount1", int(usageCounts.activeVolumeCount), volumeCount)
+		assert(t, "volumeCount", int(usageCounts.volumeCount), volumeCount)
 
 		topo.IncrementalSyncDataNodeRegistration(
 			nil,
 			[]*master_pb.VolumeShortInformationMessage{newVolumeShortMessage},
 			dn)
 		assert(t, "writables after deletion", len(layout.writables), volumeCount-1)
-		assert(t, "activeVolumeCount1", int(topo.activeVolumeCount), volumeCount-1)
-		assert(t, "volumeCount", int(topo.volumeCount), volumeCount-1)
+		assert(t, "activeVolumeCount1", int(usageCounts.activeVolumeCount), volumeCount-1)
+		assert(t, "volumeCount", int(usageCounts.volumeCount), volumeCount-1)
 
 		topo.IncrementalSyncDataNodeRegistration(
 			[]*master_pb.VolumeShortInformationMessage{newVolumeShortMessage},
@@ -146,7 +156,9 @@ func TestHandlingVolumeServerHeartbeat(t *testing.T) {
 
 	topo.UnRegisterDataNode(dn)
 
-	assert(t, "activeVolumeCount2", int(topo.activeVolumeCount), 0)
+	usageCounts := topo.diskUsages.usages[types.HardDriveType]
+
+	assert(t, "activeVolumeCount2", int(usageCounts.activeVolumeCount), 0)
 
 }
 
@@ -162,7 +174,10 @@ func TestAddRemoveVolume(t *testing.T) {
 
 	dc := topo.GetOrCreateDataCenter("dc1")
 	rack := dc.GetOrCreateRack("rack1")
-	dn := rack.GetOrCreateDataNode("127.0.0.1", 34534, "127.0.0.1", 25, 12)
+	maxVolumeCounts := make(map[string]uint32)
+	maxVolumeCounts[""] = 25
+	maxVolumeCounts["ssd"] = 12
+	dn := rack.GetOrCreateDataNode("127.0.0.1", 34534, "127.0.0.1", maxVolumeCounts)
 
 	v := storage.VolumeInfo{
 		Id:               needle.VolumeId(1),
diff --git a/weed/topology/volume_growth.go b/weed/topology/volume_growth.go
index 1ceca06a5..4b0a4837e 100644
--- a/weed/topology/volume_growth.go
+++ b/weed/topology/volume_growth.go
@@ -2,6 +2,7 @@ package topology
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"math/rand"
 	"sync"
 
@@ -27,7 +28,7 @@ type VolumeGrowOption struct {
 	Collection         string
 	ReplicaPlacement   *super_block.ReplicaPlacement
 	Ttl                *needle.TTL
-	DiskType           storage.DiskType
+	DiskType           types.DiskType
 	Prealloacte        int64
 	DataCenter         string
 	Rack               string
@@ -219,6 +220,7 @@ func (vg *VolumeGrowth) grow(grpcDialOption grpc.DialOption, topo *Topology, vid
 				ReplicaPlacement: option.ReplicaPlacement,
 				Ttl:              option.Ttl,
 				Version:          needle.CurrentVersion,
+				DiskType:         string(option.DiskType),
 			}
 			server.AddOrUpdateVolume(vi)
 			topo.RegisterVolumeLayout(vi, server)
diff --git a/weed/topology/volume_growth_test.go b/weed/topology/volume_growth_test.go
index bc9083fd2..ab30cd43f 100644
--- a/weed/topology/volume_growth_test.go
+++ b/weed/topology/volume_growth_test.go
@@ -103,7 +103,13 @@ func setup(topologyLayout string) *Topology {
 						Version: needle.CurrentVersion}
 					server.AddOrUpdateVolume(vi)
 				}
-				server.UpAdjustMaxVolumeCountDelta(int64(serverMap["limit"].(float64)))
+
+				disk := server.getOrCreateDisk("")
+				deltaDiskUsages := newDiskUsages()
+				deltaDiskUsage := deltaDiskUsages.getOrCreateDisk("")
+				deltaDiskUsage.maxVolumeCount = int64(serverMap["limit"].(float64))
+				disk.UpAdjustDiskUsageDelta(deltaDiskUsages)
+
 			}
 		}
 	}
diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index e21922310..5784c894b 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -3,6 +3,7 @@ package topology
 import (
 	"errors"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"math/rand"
 	"sync"
 	"time"
@@ -103,7 +104,7 @@ func (v *volumesBinaryState) copyState(list *VolumeLocationList) copyState {
 type VolumeLayout struct {
 	rp               *super_block.ReplicaPlacement
 	ttl              *needle.TTL
-	diskType         storage.DiskType
+	diskType         types.DiskType
 	vid2location     map[needle.VolumeId]*VolumeLocationList
 	writables        []needle.VolumeId   // transient array of writable volume id
 	readonlyVolumes  *volumesBinaryState // readonly volumes
@@ -119,7 +120,7 @@ type VolumeLayoutStats struct {
 	FileCount uint64
 }
 
-func NewVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType storage.DiskType, volumeSizeLimit uint64, replicationAsMin bool) *VolumeLayout {
+func NewVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType types.DiskType, volumeSizeLimit uint64, replicationAsMin bool) *VolumeLayout {
 	return &VolumeLayout{
 		rp:               rp,
 		ttl:              ttl,