diff --git a/unmaintained/change_superblock/change_superblock.go b/unmaintained/change_superblock/change_superblock.go
index 04db7cfc1..afe651c4e 100644
--- a/unmaintained/change_superblock/change_superblock.go
+++ b/unmaintained/change_superblock/change_superblock.go
@@ -8,9 +8,9 @@ import (
 	"strconv"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
 var (
@@ -51,7 +51,7 @@ func main() {
 	datBackend := backend.NewDiskFile(datFile)
 	defer datBackend.Close()
 
-	superBlock, err := storage.ReadSuperBlock(datBackend)
+	superBlock, err := super_block.ReadSuperBlock(datBackend)
 
 	if err != nil {
 		glog.Fatalf("cannot parse existing super block: %v", err)
@@ -63,7 +63,7 @@ func main() {
 	hasChange := false
 
 	if *targetReplica != "" {
-		replica, err := storage.NewReplicaPlacementFromString(*targetReplica)
+		replica, err := super_block.NewReplicaPlacementFromString(*targetReplica)
 
 		if err != nil {
 			glog.Fatalf("cannot parse target replica %s: %v", *targetReplica, err)
diff --git a/unmaintained/fix_dat/fix_dat.go b/unmaintained/fix_dat/fix_dat.go
index bee30b2bd..51417a9d2 100644
--- a/unmaintained/fix_dat/fix_dat.go
+++ b/unmaintained/fix_dat/fix_dat.go
@@ -9,9 +9,9 @@ import (
 	"strconv"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
@@ -59,7 +59,7 @@ func main() {
 	}
 	defer newDatFile.Close()
 
-	superBlock, err := storage.ReadSuperBlock(datBackend)
+	superBlock, err := super_block.ReadSuperBlock(datBackend)
 	if err != nil {
 		glog.Fatalf("Read Volume Data superblock %v", err)
 	}
@@ -81,7 +81,7 @@ func iterateEntries(datBackend backend.BackendStorageFile, idxFile *os.File, vis
 	readerOffset += int64(count)
 
 	// start to read dat file
-	superBlock, err := storage.ReadSuperBlock(datBackend)
+	superBlock, err := super_block.ReadSuperBlock(datBackend)
 	if err != nil {
 		fmt.Printf("cannot read dat file super block: %v", err)
 		return
diff --git a/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go b/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go
index dfbb82049..9456e5ff0 100644
--- a/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go
+++ b/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go
@@ -10,6 +10,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
 var (
@@ -24,7 +25,7 @@ func Checksum(n *needle.Needle) string {
 
 type VolumeFileScanner4SeeDat struct {
 	version needle.Version
-	block   storage.SuperBlock
+	block   super_block.SuperBlock
 
 	dir        string
 	hashes     map[string]bool
@@ -32,7 +33,7 @@ type VolumeFileScanner4SeeDat struct {
 	datBackend backend.BackendStorageFile
 }
 
-func (scanner *VolumeFileScanner4SeeDat) VisitSuperBlock(superBlock storage.SuperBlock) error {
+func (scanner *VolumeFileScanner4SeeDat) VisitSuperBlock(superBlock super_block.SuperBlock) error {
 	scanner.version = superBlock.Version()
 	scanner.block = superBlock
 	return nil
diff --git a/unmaintained/see_dat/see_dat.go b/unmaintained/see_dat/see_dat.go
index 84a06c625..e1920211e 100644
--- a/unmaintained/see_dat/see_dat.go
+++ b/unmaintained/see_dat/see_dat.go
@@ -7,6 +7,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
 var (
@@ -19,7 +20,7 @@ type VolumeFileScanner4SeeDat struct {
 	version needle.Version
 }
 
-func (scanner *VolumeFileScanner4SeeDat) VisitSuperBlock(superBlock storage.SuperBlock) error {
+func (scanner *VolumeFileScanner4SeeDat) VisitSuperBlock(superBlock super_block.SuperBlock) error {
 	scanner.version = superBlock.Version()
 	return nil
 
diff --git a/weed/command/backup.go b/weed/command/backup.go
index cef2bbe3a..a6d660006 100644
--- a/weed/command/backup.go
+++ b/weed/command/backup.go
@@ -3,10 +3,12 @@ package command
 import (
 	"fmt"
 
+	"github.com/spf13/viper"
+
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	"github.com/chrislusf/seaweedfs/weed/util"
-	"github.com/spf13/viper"
 
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/storage"
@@ -98,15 +100,15 @@ func runBackup(cmd *Command, args []string) bool {
 			return true
 		}
 	}
-	var replication *storage.ReplicaPlacement
+	var replication *super_block.ReplicaPlacement
 	if *s.replication != "" {
-		replication, err = storage.NewReplicaPlacementFromString(*s.replication)
+		replication, err = super_block.NewReplicaPlacementFromString(*s.replication)
 		if err != nil {
 			fmt.Printf("Error generate volume %d replication %s : %v\n", vid, *s.replication, err)
 			return true
 		}
 	} else {
-		replication, err = storage.NewReplicaPlacementFromString(stats.Replication)
+		replication, err = super_block.NewReplicaPlacementFromString(stats.Replication)
 		if err != nil {
 			fmt.Printf("Error get volume %d replication %s : %v\n", vid, stats.Replication, err)
 			return true
diff --git a/weed/command/export.go b/weed/command/export.go
index d3a765e09..a27b88c64 100644
--- a/weed/command/export.go
+++ b/weed/command/export.go
@@ -4,6 +4,7 @@ import (
 	"archive/tar"
 	"bytes"
 	"fmt"
+	"io"
 	"os"
 	"path"
 	"path/filepath"
@@ -12,11 +13,10 @@ import (
 	"text/template"
 	"time"
 
-	"io"
-
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"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"
 )
 
@@ -93,8 +93,8 @@ type VolumeFileScanner4Export struct {
 	vid       needle.VolumeId
 }
 
-func (scanner *VolumeFileScanner4Export) VisitSuperBlock(superBlock storage.SuperBlock) error {
-	scanner.version = superBlock.Version()
+func (scanner *VolumeFileScanner4Export) VisitSuperBlock(superBlock super_block.SuperBlock) error {
+	scanner.version = superBlock.Version
 	return nil
 
 }
diff --git a/weed/command/fix.go b/weed/command/fix.go
index 2fbbca5e6..9acf1801f 100644
--- a/weed/command/fix.go
+++ b/weed/command/fix.go
@@ -8,6 +8,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"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"
 )
 
@@ -34,8 +35,8 @@ type VolumeFileScanner4Fix struct {
 	nm      *storage.NeedleMap
 }
 
-func (scanner *VolumeFileScanner4Fix) VisitSuperBlock(superBlock storage.SuperBlock) error {
-	scanner.version = superBlock.Version()
+func (scanner *VolumeFileScanner4Fix) VisitSuperBlock(superBlock super_block.SuperBlock) error {
+	scanner.version = superBlock.Version
 	return nil
 
 }
diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index 81c9901b9..1ea358f35 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -66,6 +66,8 @@ service VolumeServer {
     }
     rpc VolumeEcBlobDelete (VolumeEcBlobDeleteRequest) returns (VolumeEcBlobDeleteResponse) {
     }
+    rpc VolumeEcShardsToVolume (VolumeEcShardsToVolumeRequest) returns (VolumeEcShardsToVolumeResponse) {
+    }
 
     // tiered storage
     rpc VolumeTierCopyDatToRemote (VolumeTierCopyDatToRemoteRequest) returns (stream VolumeTierCopyDatToRemoteResponse) {
@@ -203,6 +205,7 @@ message CopyFileRequest {
     uint64 stop_offset = 4;
     string collection = 5;
     bool is_ec_volume = 6;
+    bool ignore_source_file_not_found = 7;
 }
 message CopyFileResponse {
     bytes file_content = 1;
@@ -249,6 +252,7 @@ message VolumeEcShardsCopyRequest {
     repeated uint32 shard_ids = 3;
     bool copy_ecx_file = 4;
     string source_data_node = 5;
+    bool copy_ecj_file = 6;
 }
 message VolumeEcShardsCopyResponse {
 }
@@ -297,6 +301,13 @@ message VolumeEcBlobDeleteRequest {
 message VolumeEcBlobDeleteResponse {
 }
 
+message VolumeEcShardsToVolumeRequest {
+    uint32 volume_id = 1;
+    string collection = 2;
+}
+message VolumeEcShardsToVolumeResponse {
+}
+
 message ReadVolumeFileStatusRequest {
     uint32 volume_id = 1;
 }
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index 030310644..7afd8031e 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -61,6 +61,8 @@ It has these top-level messages:
 	VolumeEcShardReadResponse
 	VolumeEcBlobDeleteRequest
 	VolumeEcBlobDeleteResponse
+	VolumeEcShardsToVolumeRequest
+	VolumeEcShardsToVolumeResponse
 	ReadVolumeFileStatusRequest
 	ReadVolumeFileStatusResponse
 	DiskStatus
@@ -663,12 +665,13 @@ func (m *VolumeCopyResponse) GetLastAppendAtNs() uint64 {
 }
 
 type CopyFileRequest struct {
-	VolumeId           uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
-	Ext                string `protobuf:"bytes,2,opt,name=ext" json:"ext,omitempty"`
-	CompactionRevision uint32 `protobuf:"varint,3,opt,name=compaction_revision,json=compactionRevision" json:"compaction_revision,omitempty"`
-	StopOffset         uint64 `protobuf:"varint,4,opt,name=stop_offset,json=stopOffset" json:"stop_offset,omitempty"`
-	Collection         string `protobuf:"bytes,5,opt,name=collection" json:"collection,omitempty"`
-	IsEcVolume         bool   `protobuf:"varint,6,opt,name=is_ec_volume,json=isEcVolume" json:"is_ec_volume,omitempty"`
+	VolumeId                 uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
+	Ext                      string `protobuf:"bytes,2,opt,name=ext" json:"ext,omitempty"`
+	CompactionRevision       uint32 `protobuf:"varint,3,opt,name=compaction_revision,json=compactionRevision" json:"compaction_revision,omitempty"`
+	StopOffset               uint64 `protobuf:"varint,4,opt,name=stop_offset,json=stopOffset" json:"stop_offset,omitempty"`
+	Collection               string `protobuf:"bytes,5,opt,name=collection" json:"collection,omitempty"`
+	IsEcVolume               bool   `protobuf:"varint,6,opt,name=is_ec_volume,json=isEcVolume" json:"is_ec_volume,omitempty"`
+	IgnoreSourceFileNotFound bool   `protobuf:"varint,7,opt,name=ignore_source_file_not_found,json=ignoreSourceFileNotFound" json:"ignore_source_file_not_found,omitempty"`
 }
 
 func (m *CopyFileRequest) Reset()                    { *m = CopyFileRequest{} }
@@ -718,6 +721,13 @@ func (m *CopyFileRequest) GetIsEcVolume() bool {
 	return false
 }
 
+func (m *CopyFileRequest) GetIgnoreSourceFileNotFound() bool {
+	if m != nil {
+		return m.IgnoreSourceFileNotFound
+	}
+	return false
+}
+
 type CopyFileResponse struct {
 	FileContent []byte `protobuf:"bytes,1,opt,name=file_content,json=fileContent,proto3" json:"file_content,omitempty"`
 }
@@ -924,6 +934,7 @@ type VolumeEcShardsCopyRequest struct {
 	ShardIds       []uint32 `protobuf:"varint,3,rep,packed,name=shard_ids,json=shardIds" json:"shard_ids,omitempty"`
 	CopyEcxFile    bool     `protobuf:"varint,4,opt,name=copy_ecx_file,json=copyEcxFile" json:"copy_ecx_file,omitempty"`
 	SourceDataNode string   `protobuf:"bytes,5,opt,name=source_data_node,json=sourceDataNode" json:"source_data_node,omitempty"`
+	CopyEcjFile    bool     `protobuf:"varint,6,opt,name=copy_ecj_file,json=copyEcjFile" json:"copy_ecj_file,omitempty"`
 }
 
 func (m *VolumeEcShardsCopyRequest) Reset()                    { *m = VolumeEcShardsCopyRequest{} }
@@ -966,6 +977,13 @@ func (m *VolumeEcShardsCopyRequest) GetSourceDataNode() string {
 	return ""
 }
 
+func (m *VolumeEcShardsCopyRequest) GetCopyEcjFile() bool {
+	if m != nil {
+		return m.CopyEcjFile
+	}
+	return false
+}
+
 type VolumeEcShardsCopyResponse struct {
 }
 
@@ -1206,6 +1224,38 @@ func (m *VolumeEcBlobDeleteResponse) String() string            { return proto.C
 func (*VolumeEcBlobDeleteResponse) ProtoMessage()               {}
 func (*VolumeEcBlobDeleteResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{51} }
 
+type VolumeEcShardsToVolumeRequest struct {
+	VolumeId   uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
+	Collection string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
+}
+
+func (m *VolumeEcShardsToVolumeRequest) Reset()                    { *m = VolumeEcShardsToVolumeRequest{} }
+func (m *VolumeEcShardsToVolumeRequest) String() string            { return proto.CompactTextString(m) }
+func (*VolumeEcShardsToVolumeRequest) ProtoMessage()               {}
+func (*VolumeEcShardsToVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{52} }
+
+func (m *VolumeEcShardsToVolumeRequest) GetVolumeId() uint32 {
+	if m != nil {
+		return m.VolumeId
+	}
+	return 0
+}
+
+func (m *VolumeEcShardsToVolumeRequest) GetCollection() string {
+	if m != nil {
+		return m.Collection
+	}
+	return ""
+}
+
+type VolumeEcShardsToVolumeResponse struct {
+}
+
+func (m *VolumeEcShardsToVolumeResponse) Reset()                    { *m = VolumeEcShardsToVolumeResponse{} }
+func (m *VolumeEcShardsToVolumeResponse) String() string            { return proto.CompactTextString(m) }
+func (*VolumeEcShardsToVolumeResponse) ProtoMessage()               {}
+func (*VolumeEcShardsToVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{53} }
+
 type ReadVolumeFileStatusRequest struct {
 	VolumeId uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
 }
@@ -1213,7 +1263,7 @@ type ReadVolumeFileStatusRequest struct {
 func (m *ReadVolumeFileStatusRequest) Reset()                    { *m = ReadVolumeFileStatusRequest{} }
 func (m *ReadVolumeFileStatusRequest) String() string            { return proto.CompactTextString(m) }
 func (*ReadVolumeFileStatusRequest) ProtoMessage()               {}
-func (*ReadVolumeFileStatusRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{52} }
+func (*ReadVolumeFileStatusRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{54} }
 
 func (m *ReadVolumeFileStatusRequest) GetVolumeId() uint32 {
 	if m != nil {
@@ -1236,7 +1286,7 @@ type ReadVolumeFileStatusResponse struct {
 func (m *ReadVolumeFileStatusResponse) Reset()                    { *m = ReadVolumeFileStatusResponse{} }
 func (m *ReadVolumeFileStatusResponse) String() string            { return proto.CompactTextString(m) }
 func (*ReadVolumeFileStatusResponse) ProtoMessage()               {}
-func (*ReadVolumeFileStatusResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{53} }
+func (*ReadVolumeFileStatusResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{55} }
 
 func (m *ReadVolumeFileStatusResponse) GetVolumeId() uint32 {
 	if m != nil {
@@ -1304,7 +1354,7 @@ type DiskStatus struct {
 func (m *DiskStatus) Reset()                    { *m = DiskStatus{} }
 func (m *DiskStatus) String() string            { return proto.CompactTextString(m) }
 func (*DiskStatus) ProtoMessage()               {}
-func (*DiskStatus) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{54} }
+func (*DiskStatus) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{56} }
 
 func (m *DiskStatus) GetDir() string {
 	if m != nil {
@@ -1347,7 +1397,7 @@ type MemStatus struct {
 func (m *MemStatus) Reset()                    { *m = MemStatus{} }
 func (m *MemStatus) String() string            { return proto.CompactTextString(m) }
 func (*MemStatus) ProtoMessage()               {}
-func (*MemStatus) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{55} }
+func (*MemStatus) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{57} }
 
 func (m *MemStatus) GetGoroutines() int32 {
 	if m != nil {
@@ -1411,7 +1461,7 @@ type RemoteFile struct {
 func (m *RemoteFile) Reset()                    { *m = RemoteFile{} }
 func (m *RemoteFile) String() string            { return proto.CompactTextString(m) }
 func (*RemoteFile) ProtoMessage()               {}
-func (*RemoteFile) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{56} }
+func (*RemoteFile) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{58} }
 
 func (m *RemoteFile) GetBackendType() string {
 	if m != nil {
@@ -1462,7 +1512,7 @@ type VolumeTierInfo struct {
 func (m *VolumeTierInfo) Reset()                    { *m = VolumeTierInfo{} }
 func (m *VolumeTierInfo) String() string            { return proto.CompactTextString(m) }
 func (*VolumeTierInfo) ProtoMessage()               {}
-func (*VolumeTierInfo) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{57} }
+func (*VolumeTierInfo) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{59} }
 
 func (m *VolumeTierInfo) GetFiles() []*RemoteFile {
 	if m != nil {
@@ -1482,7 +1532,7 @@ func (m *VolumeTierCopyDatToRemoteRequest) Reset()         { *m = VolumeTierCopy
 func (m *VolumeTierCopyDatToRemoteRequest) String() string { return proto.CompactTextString(m) }
 func (*VolumeTierCopyDatToRemoteRequest) ProtoMessage()    {}
 func (*VolumeTierCopyDatToRemoteRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{58}
+	return fileDescriptor0, []int{60}
 }
 
 func (m *VolumeTierCopyDatToRemoteRequest) GetVolumeId() uint32 {
@@ -1522,7 +1572,7 @@ func (m *VolumeTierCopyDatToRemoteResponse) Reset()         { *m = VolumeTierCop
 func (m *VolumeTierCopyDatToRemoteResponse) String() string { return proto.CompactTextString(m) }
 func (*VolumeTierCopyDatToRemoteResponse) ProtoMessage()    {}
 func (*VolumeTierCopyDatToRemoteResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{59}
+	return fileDescriptor0, []int{61}
 }
 
 func (m *VolumeTierCopyDatToRemoteResponse) GetProcessed() int64 {
@@ -1551,7 +1601,7 @@ type QueryRequest struct {
 func (m *QueryRequest) Reset()                    { *m = QueryRequest{} }
 func (m *QueryRequest) String() string            { return proto.CompactTextString(m) }
 func (*QueryRequest) ProtoMessage()               {}
-func (*QueryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{60} }
+func (*QueryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{62} }
 
 func (m *QueryRequest) GetSelections() []string {
 	if m != nil {
@@ -1597,7 +1647,7 @@ type QueryRequest_Filter struct {
 func (m *QueryRequest_Filter) Reset()                    { *m = QueryRequest_Filter{} }
 func (m *QueryRequest_Filter) String() string            { return proto.CompactTextString(m) }
 func (*QueryRequest_Filter) ProtoMessage()               {}
-func (*QueryRequest_Filter) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{60, 0} }
+func (*QueryRequest_Filter) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{62, 0} }
 
 func (m *QueryRequest_Filter) GetField() string {
 	if m != nil {
@@ -1632,7 +1682,7 @@ func (m *QueryRequest_InputSerialization) Reset()         { *m = QueryRequest_In
 func (m *QueryRequest_InputSerialization) String() string { return proto.CompactTextString(m) }
 func (*QueryRequest_InputSerialization) ProtoMessage()    {}
 func (*QueryRequest_InputSerialization) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{60, 1}
+	return fileDescriptor0, []int{62, 1}
 }
 
 func (m *QueryRequest_InputSerialization) GetCompressionType() string {
@@ -1680,7 +1730,7 @@ func (m *QueryRequest_InputSerialization_CSVInput) Reset() {
 func (m *QueryRequest_InputSerialization_CSVInput) String() string { return proto.CompactTextString(m) }
 func (*QueryRequest_InputSerialization_CSVInput) ProtoMessage()    {}
 func (*QueryRequest_InputSerialization_CSVInput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{60, 1, 0}
+	return fileDescriptor0, []int{62, 1, 0}
 }
 
 func (m *QueryRequest_InputSerialization_CSVInput) GetFileHeaderInfo() string {
@@ -1742,7 +1792,7 @@ func (m *QueryRequest_InputSerialization_JSONInput) Reset() {
 func (m *QueryRequest_InputSerialization_JSONInput) String() string { return proto.CompactTextString(m) }
 func (*QueryRequest_InputSerialization_JSONInput) ProtoMessage()    {}
 func (*QueryRequest_InputSerialization_JSONInput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{60, 1, 1}
+	return fileDescriptor0, []int{62, 1, 1}
 }
 
 func (m *QueryRequest_InputSerialization_JSONInput) GetType() string {
@@ -1763,7 +1813,7 @@ func (m *QueryRequest_InputSerialization_ParquetInput) String() string {
 }
 func (*QueryRequest_InputSerialization_ParquetInput) ProtoMessage() {}
 func (*QueryRequest_InputSerialization_ParquetInput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{60, 1, 2}
+	return fileDescriptor0, []int{62, 1, 2}
 }
 
 type QueryRequest_OutputSerialization struct {
@@ -1775,7 +1825,7 @@ func (m *QueryRequest_OutputSerialization) Reset()         { *m = QueryRequest_O
 func (m *QueryRequest_OutputSerialization) String() string { return proto.CompactTextString(m) }
 func (*QueryRequest_OutputSerialization) ProtoMessage()    {}
 func (*QueryRequest_OutputSerialization) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{60, 2}
+	return fileDescriptor0, []int{62, 2}
 }
 
 func (m *QueryRequest_OutputSerialization) GetCsvOutput() *QueryRequest_OutputSerialization_CSVOutput {
@@ -1808,7 +1858,7 @@ func (m *QueryRequest_OutputSerialization_CSVOutput) String() string {
 }
 func (*QueryRequest_OutputSerialization_CSVOutput) ProtoMessage() {}
 func (*QueryRequest_OutputSerialization_CSVOutput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{60, 2, 0}
+	return fileDescriptor0, []int{62, 2, 0}
 }
 
 func (m *QueryRequest_OutputSerialization_CSVOutput) GetQuoteFields() string {
@@ -1858,7 +1908,7 @@ func (m *QueryRequest_OutputSerialization_JSONOutput) String() string {
 }
 func (*QueryRequest_OutputSerialization_JSONOutput) ProtoMessage() {}
 func (*QueryRequest_OutputSerialization_JSONOutput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{60, 2, 1}
+	return fileDescriptor0, []int{62, 2, 1}
 }
 
 func (m *QueryRequest_OutputSerialization_JSONOutput) GetRecordDelimiter() string {
@@ -1875,7 +1925,7 @@ type QueriedStripe struct {
 func (m *QueriedStripe) Reset()                    { *m = QueriedStripe{} }
 func (m *QueriedStripe) String() string            { return proto.CompactTextString(m) }
 func (*QueriedStripe) ProtoMessage()               {}
-func (*QueriedStripe) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{61} }
+func (*QueriedStripe) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{63} }
 
 func (m *QueriedStripe) GetRecords() []byte {
 	if m != nil {
@@ -1937,6 +1987,8 @@ func init() {
 	proto.RegisterType((*VolumeEcShardReadResponse)(nil), "volume_server_pb.VolumeEcShardReadResponse")
 	proto.RegisterType((*VolumeEcBlobDeleteRequest)(nil), "volume_server_pb.VolumeEcBlobDeleteRequest")
 	proto.RegisterType((*VolumeEcBlobDeleteResponse)(nil), "volume_server_pb.VolumeEcBlobDeleteResponse")
+	proto.RegisterType((*VolumeEcShardsToVolumeRequest)(nil), "volume_server_pb.VolumeEcShardsToVolumeRequest")
+	proto.RegisterType((*VolumeEcShardsToVolumeResponse)(nil), "volume_server_pb.VolumeEcShardsToVolumeResponse")
 	proto.RegisterType((*ReadVolumeFileStatusRequest)(nil), "volume_server_pb.ReadVolumeFileStatusRequest")
 	proto.RegisterType((*ReadVolumeFileStatusResponse)(nil), "volume_server_pb.ReadVolumeFileStatusResponse")
 	proto.RegisterType((*DiskStatus)(nil), "volume_server_pb.DiskStatus")
@@ -1997,6 +2049,7 @@ type VolumeServerClient interface {
 	VolumeEcShardsUnmount(ctx context.Context, in *VolumeEcShardsUnmountRequest, opts ...grpc.CallOption) (*VolumeEcShardsUnmountResponse, error)
 	VolumeEcShardRead(ctx context.Context, in *VolumeEcShardReadRequest, opts ...grpc.CallOption) (VolumeServer_VolumeEcShardReadClient, error)
 	VolumeEcBlobDelete(ctx context.Context, in *VolumeEcBlobDeleteRequest, opts ...grpc.CallOption) (*VolumeEcBlobDeleteResponse, error)
+	VolumeEcShardsToVolume(ctx context.Context, in *VolumeEcShardsToVolumeRequest, opts ...grpc.CallOption) (*VolumeEcShardsToVolumeResponse, error)
 	// tiered storage
 	VolumeTierCopyDatToRemote(ctx context.Context, in *VolumeTierCopyDatToRemoteRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTierCopyDatToRemoteClient, error)
 	// query
@@ -2337,6 +2390,15 @@ func (c *volumeServerClient) VolumeEcBlobDelete(ctx context.Context, in *VolumeE
 	return out, nil
 }
 
+func (c *volumeServerClient) VolumeEcShardsToVolume(ctx context.Context, in *VolumeEcShardsToVolumeRequest, opts ...grpc.CallOption) (*VolumeEcShardsToVolumeResponse, error) {
+	out := new(VolumeEcShardsToVolumeResponse)
+	err := grpc.Invoke(ctx, "/volume_server_pb.VolumeServer/VolumeEcShardsToVolume", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *volumeServerClient) VolumeTierCopyDatToRemote(ctx context.Context, in *VolumeTierCopyDatToRemoteRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTierCopyDatToRemoteClient, error) {
 	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[4], c.cc, "/volume_server_pb.VolumeServer/VolumeTierCopyDatToRemote", opts...)
 	if err != nil {
@@ -2433,6 +2495,7 @@ type VolumeServerServer interface {
 	VolumeEcShardsUnmount(context.Context, *VolumeEcShardsUnmountRequest) (*VolumeEcShardsUnmountResponse, error)
 	VolumeEcShardRead(*VolumeEcShardReadRequest, VolumeServer_VolumeEcShardReadServer) error
 	VolumeEcBlobDelete(context.Context, *VolumeEcBlobDeleteRequest) (*VolumeEcBlobDeleteResponse, error)
+	VolumeEcShardsToVolume(context.Context, *VolumeEcShardsToVolumeRequest) (*VolumeEcShardsToVolumeResponse, error)
 	// tiered storage
 	VolumeTierCopyDatToRemote(*VolumeTierCopyDatToRemoteRequest, VolumeServer_VolumeTierCopyDatToRemoteServer) error
 	// query
@@ -2923,6 +2986,24 @@ func _VolumeServer_VolumeEcBlobDelete_Handler(srv interface{}, ctx context.Conte
 	return interceptor(ctx, in, info, handler)
 }
 
+func _VolumeServer_VolumeEcShardsToVolume_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(VolumeEcShardsToVolumeRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(VolumeServerServer).VolumeEcShardsToVolume(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/volume_server_pb.VolumeServer/VolumeEcShardsToVolume",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(VolumeServerServer).VolumeEcShardsToVolume(ctx, req.(*VolumeEcShardsToVolumeRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _VolumeServer_VolumeTierCopyDatToRemote_Handler(srv interface{}, stream grpc.ServerStream) error {
 	m := new(VolumeTierCopyDatToRemoteRequest)
 	if err := stream.RecvMsg(m); err != nil {
@@ -3057,6 +3138,10 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 			MethodName: "VolumeEcBlobDelete",
 			Handler:    _VolumeServer_VolumeEcBlobDelete_Handler,
 		},
+		{
+			MethodName: "VolumeEcShardsToVolume",
+			Handler:    _VolumeServer_VolumeEcShardsToVolume_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
@@ -3096,176 +3181,181 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("volume_server.proto", fileDescriptor0) }
 
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+	0x5e, 0x27, 0xfa, 0x74, 0x16, 0xb0, 0x3b, 0x02, 0xf4, 0x3f, 0xe9, 0x4a, 0xc6, 0xdb, 0x00, 0x13,
+	0xfd, 0x2b, 0x55, 0x68, 0x55, 0xaa, 0x60, 0x5e, 0x81, 0x25, 0x6e, 0x59, 0x8f, 0xb8, 0x7b, 0x2c,
+	0xf6, 0x22, 0xd1, 0xc2, 0x93, 0x38, 0x89, 0x2a, 0x6f, 0xf4, 0xe7, 0xd6, 0x1f, 0xcf, 0x42, 0x3f,
+	0xfb, 0x74, 0x83, 0xbe, 0x80, 0x5e, 0xa6, 0x55, 0x89, 0x5e, 0x2e, 0x6f, 0x5a, 0xb9, 0xf5, 0x69,
+	0xbc, 0x32, 0x05, 0x4b, 0x55, 0x00, 0x33, 0x28, 0x84, 0xd3, 0xa5, 0x7e, 0x1f, 0xba, 0x5a, 0xa6,
+	0xae, 0xeb, 0x26, 0x1a, 0xaf, 0x37, 0xc2, 0x4d, 0xe5, 0x31, 0x58, 0xad, 0x68, 0xe0, 0xa1, 0x37,
+	0xa6, 0x70, 0xc9, 0x35, 0x11, 0x8d, 0x6b, 0x0d, 0xb1, 0x53, 0xa9, 0x8f, 0x01, 0x95, 0xbb, 0x7b,
+	0xe8, 0xf5, 0xa9, 0x6c, 0x26, 0xdd, 0x43, 0xe3, 0x8d, 0x66, 0xc8, 0xb5, 0x8a, 0xca, 0xbe, 0xdf,
+	0x54, 0x45, 0x73, 0x9d, 0xc5, 0xa9, 0x8a, 0x16, 0x9a, 0x89, 0x33, 0xe8, 0x10, 0x56, 0x8a, 0x3d,
+	0x41, 0x74, 0xa5, 0xae, 0x87, 0x5d, 0x6a, 0x39, 0x1a, 0x57, 0x9b, 0xa0, 0xa6, 0xc2, 0x08, 0x9c,
+	0xca, 0xf7, 0xe0, 0xd0, 0x6b, 0x65, 0xfa, 0xca, 0x2e, 0xa4, 0x71, 0x79, 0x3a, 0x62, 0x56, 0xa7,
+	0x62, 0x5f, 0xae, 0x4a, 0xa7, 0x9a, 0xa6, 0x5f, 0x95, 0x4e, 0x75, 0x6d, 0x3e, 0x73, 0x06, 0xfd,
+	0x42, 0x37, 0x7b, 0x0a, 0xfd, 0x2a, 0xb4, 0x59, 0xc7, 0xa6, 0xba, 0x61, 0x66, 0x5c, 0x6f, 0x8c,
+	0xaf, 0x65, 0xdf, 0x68, 0xf1, 0x58, 0xcf, 0xb4, 0xad, 0xaa, 0x62, 0xbd, 0xdc, 0x08, 0xab, 0x8a,
+	0xf5, 0xaa, 0xde, 0xd7, 0x0c, 0xda, 0x87, 0xa5, 0x5c, 0x23, 0x0b, 0xbd, 0x5a, 0x47, 0x99, 0x7f,
+	0x9d, 0x32, 0x5e, 0x9b, 0x8a, 0x97, 0xca, 0xb0, 0x75, 0xf6, 0x52, 0xe9, 0xaa, 0x76, 0x71, 0xf9,
+	0x7c, 0xf5, 0xea, 0x34, 0xb4, 0x5c, 0x28, 0x97, 0xda, 0x5d, 0x95, 0xa1, 0x5c, 0xd7, 0x4e, 0xab,
+	0x0c, 0xe5, 0xfa, 0x0e, 0xda, 0x0c, 0xfa, 0x29, 0xc0, 0xa4, 0x25, 0x85, 0x5e, 0xaa, 0xa3, 0xce,
+	0xee, 0xfe, 0xcb, 0xc7, 0x23, 0xa5, 0xac, 0xbf, 0x82, 0xb5, 0xaa, 0x57, 0x14, 0x74, 0xad, 0xaa,
+	0x20, 0xac, 0x7d, 0xaa, 0x31, 0x36, 0x9b, 0xa2, 0xa7, 0x82, 0x3f, 0x85, 0x8e, 0x6e, 0x07, 0xa1,
+	0x17, 0xcb, 0xd4, 0x85, 0x06, 0x9a, 0x61, 0x1e, 0x87, 0x92, 0x71, 0xe0, 0x40, 0xc7, 0xea, 0xa4,
+	0x4f, 0x53, 0x1f, 0xab, 0xa5, 0x8e, 0x52, 0x7d, 0xac, 0x96, 0xdb, 0x3e, 0x42, 0x5c, 0xea, 0x0c,
+	0xd9, 0xb6, 0x46, 0xbd, 0x33, 0x54, 0x74, 0x6d, 0xea, 0x9d, 0xa1, 0xb2, 0x53, 0x32, 0x83, 0x7e,
+	0x09, 0xeb, 0xd5, 0xdd, 0x0c, 0x54, 0x1b, 0xf1, 0x35, 0x5d, 0x15, 0xe3, 0x46, 0x73, 0x82, 0x54,
+	0xfc, 0x53, 0x9d, 0x9f, 0x0a, 0xdd, 0x8c, 0xfa, 0xfc, 0x54, 0xdd, 0x53, 0x31, 0xae, 0x37, 0xc6,
+	0x2f, 0x87, 0x5e, 0xb6, 0x25, 0x50, 0x6f, 0xed, 0x8a, 0x0e, 0x49, 0xbd, 0xb5, 0x2b, 0xbb, 0x0c,
+	0x22, 0x3e, 0xaa, 0x9e, 0xfb, 0xab, 0xe2, 0xe3, 0x98, 0x7e, 0x84, 0xb1, 0xd9, 0x14, 0x3d, 0x77,
+	0x7c, 0x97, 0xdf, 0xf3, 0xd1, 0xd4, 0xf5, 0xe7, 0x32, 0xf3, 0xb5, 0x86, 0xd8, 0xf5, 0xbb, 0xab,
+	0x33, 0xf5, 0x54, 0x05, 0x0a, 0x19, 0xfb, 0x7a, 0x63, 0xfc, 0x54, 0x76, 0xa4, 0x7f, 0x14, 0xc8,
+	0xbc, 0xc5, 0xa3, 0xab, 0x53, 0xf8, 0x64, 0x7a, 0x09, 0xc6, 0xeb, 0x8d, 0x70, 0xab, 0xa2, 0x37,
+	0xfb, 0x3a, 0x7e, 0x9c, 0x3f, 0x95, 0x9e, 0xf4, 0x8f, 0xf3, 0xa7, 0x8a, 0x07, 0xf7, 0x8a, 0xe8,
+	0xd5, 0x8f, 0xe2, 0xd3, 0xa3, 0xb7, 0xf0, 0x38, 0x3f, 0x3d, 0x7a, 0x4b, 0xef, 0xed, 0x33, 0xe8,
+	0xd7, 0x93, 0x06, 0x72, 0xf9, 0xe1, 0x0b, 0x6d, 0xd5, 0xa6, 0xa2, 0xda, 0xf7, 0x3e, 0xe3, 0xad,
+	0x13, 0xd1, 0x64, 0x8c, 0xff, 0x11, 0xcc, 0x8b, 0x62, 0x0f, 0x5d, 0x3c, 0xbe, 0x0a, 0x34, 0x2e,
+	0x55, 0xcf, 0xa7, 0xb5, 0x0c, 0xe7, 0xb6, 0xbf, 0x20, 0xfe, 0xcc, 0x7c, 0xeb, 0x3f, 0x01, 0x00,
+	0x00, 0xff, 0xff, 0x59, 0x62, 0x68, 0x9d, 0xb0, 0x29, 0x00, 0x00,
 }
diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index 8fc56e9b8..856c07890 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -5,10 +5,11 @@ import (
 	"fmt"
 
 	"github.com/chrislusf/raft"
+
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/security"
-	"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/topology"
 )
 
@@ -52,7 +53,7 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest
 	if req.Replication == "" {
 		req.Replication = ms.option.DefaultReplicaPlacement
 	}
-	replicaPlacement, err := storage.NewReplicaPlacementFromString(req.Replication)
+	replicaPlacement, err := super_block.NewReplicaPlacementFromString(req.Replication)
 	if err != nil {
 		return nil, err
 	}
@@ -108,7 +109,7 @@ func (ms *MasterServer) Statistics(ctx context.Context, req *master_pb.Statistic
 	if req.Replication == "" {
 		req.Replication = ms.option.DefaultReplicaPlacement
 	}
-	replicaPlacement, err := storage.NewReplicaPlacementFromString(req.Replication)
+	replicaPlacement, err := super_block.NewReplicaPlacementFromString(req.Replication)
 	if err != nil {
 		return nil, err
 	}
diff --git a/weed/server/master_server_handlers_admin.go b/weed/server/master_server_handlers_admin.go
index a5d976008..2965a4863 100644
--- a/weed/server/master_server_handlers_admin.go
+++ b/weed/server/master_server_handlers_admin.go
@@ -10,9 +10,9 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
-	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend/memory_map"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	"github.com/chrislusf/seaweedfs/weed/topology"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
@@ -145,7 +145,7 @@ func (ms *MasterServer) getVolumeGrowOption(r *http.Request) (*topology.VolumeGr
 	if replicationString == "" {
 		replicationString = ms.option.DefaultReplicaPlacement
 	}
-	replicaPlacement, err := storage.NewReplicaPlacementFromString(replicationString)
+	replicaPlacement, err := super_block.NewReplicaPlacementFromString(replicationString)
 	if err != nil {
 		return nil, err
 	}
diff --git a/weed/server/volume_grpc_copy.go b/weed/server/volume_grpc_copy.go
index 711a3ebad..8a1ede1b8 100644
--- a/weed/server/volume_grpc_copy.go
+++ b/weed/server/volume_grpc_copy.go
@@ -55,11 +55,11 @@ func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.Vo
 
 		// println("source:", volFileInfoResp.String())
 		// copy ecx file
-		if err := vs.doCopyFile(ctx, client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.IdxFileSize, volumeFileName, ".idx", false); err != nil {
+		if err := vs.doCopyFile(ctx, client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.IdxFileSize, volumeFileName, ".idx", false, false); err != nil {
 			return err
 		}
 
-		if err := vs.doCopyFile(ctx, client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, volumeFileName, ".dat", false); err != nil {
+		if err := vs.doCopyFile(ctx, client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, volumeFileName, ".dat", false, true); err != nil {
 			return err
 		}
 
@@ -95,15 +95,16 @@ func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.Vo
 }
 
 func (vs *VolumeServer) doCopyFile(ctx context.Context, client volume_server_pb.VolumeServerClient, isEcVolume bool, collection string, vid uint32,
-	compactRevision uint32, stopOffset uint64, baseFileName, ext string, isAppend bool) error {
+	compactRevision uint32, stopOffset uint64, baseFileName, ext string, isAppend bool, ignoreSourceFileNotFound bool) error {
 
 	copyFileClient, err := client.CopyFile(ctx, &volume_server_pb.CopyFileRequest{
-		VolumeId:           vid,
-		Ext:                ext,
-		CompactionRevision: compactRevision,
-		StopOffset:         stopOffset,
-		Collection:         collection,
-		IsEcVolume:         isEcVolume,
+		VolumeId:                 vid,
+		Ext:                      ext,
+		CompactionRevision:       compactRevision,
+		StopOffset:               stopOffset,
+		Collection:               collection,
+		IsEcVolume:               isEcVolume,
+		IgnoreSourceFileNotFound: ignoreSourceFileNotFound,
 	})
 	if err != nil {
 		return fmt.Errorf("failed to start copying volume %d %s file: %v", vid, ext, err)
@@ -221,6 +222,9 @@ func (vs *VolumeServer) CopyFile(req *volume_server_pb.CopyFileRequest, stream v
 
 	file, err := os.Open(fileName)
 	if err != nil {
+		if req.IgnoreSourceFileNotFound && err == os.ErrNotExist {
+			return nil
+		}
 		return err
 	}
 	defer file.Close()
diff --git a/weed/server/volume_grpc_erasure_coding.go b/weed/server/volume_grpc_erasure_coding.go
index 6ded84cc3..8626cf344 100644
--- a/weed/server/volume_grpc_erasure_coding.go
+++ b/weed/server/volume_grpc_erasure_coding.go
@@ -8,6 +8,7 @@ import (
 	"math"
 	"os"
 	"path"
+	"path/filepath"
 	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -24,7 +25,7 @@ import (
 
 Steps to apply erasure coding to .dat .idx files
 0. ensure the volume is readonly
-1. client call VolumeEcShardsGenerate to generate the .ecx and .ec01~.ec14 files
+1. client call VolumeEcShardsGenerate to generate the .ecx and .ec00 ~ .ec13 files
 2. client ask master for possible servers to hold the ec files, at least 4 servers
 3. client call VolumeEcShardsCopy on above target servers to copy ec files from the source server
 4. target servers report the new ec files to the master
@@ -33,7 +34,7 @@ Steps to apply erasure coding to .dat .idx files
 
 */
 
-// VolumeEcShardsGenerate generates the .ecx and .ec01 ~ .ec14 files
+// VolumeEcShardsGenerate generates the .ecx and .ec00 ~ .ec13 files
 func (vs *VolumeServer) VolumeEcShardsGenerate(ctx context.Context, req *volume_server_pb.VolumeEcShardsGenerateRequest) (*volume_server_pb.VolumeEcShardsGenerateResponse, error) {
 
 	v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
@@ -51,7 +52,7 @@ func (vs *VolumeServer) VolumeEcShardsGenerate(ctx context.Context, req *volume_
 		return nil, fmt.Errorf("WriteSortedFileFromIdx %s: %v", baseFileName, err)
 	}
 
-	// write .ec01 ~ .ec14 files
+	// write .ec00 ~ .ec13 files
 	if err := erasure_coding.WriteEcFiles(baseFileName); err != nil {
 		return nil, fmt.Errorf("WriteEcFiles %s: %v", baseFileName, err)
 	}
@@ -59,7 +60,7 @@ func (vs *VolumeServer) VolumeEcShardsGenerate(ctx context.Context, req *volume_
 	return &volume_server_pb.VolumeEcShardsGenerateResponse{}, nil
 }
 
-// VolumeEcShardsRebuild generates the any of the missing .ec01 ~ .ec14 files
+// VolumeEcShardsRebuild generates the any of the missing .ec00 ~ .ec13 files
 func (vs *VolumeServer) VolumeEcShardsRebuild(ctx context.Context, req *volume_server_pb.VolumeEcShardsRebuildRequest) (*volume_server_pb.VolumeEcShardsRebuildResponse, error) {
 
 	baseFileName := erasure_coding.EcShardBaseFileName(req.Collection, int(req.VolumeId))
@@ -68,7 +69,7 @@ func (vs *VolumeServer) VolumeEcShardsRebuild(ctx context.Context, req *volume_s
 
 	for _, location := range vs.store.Locations {
 		if util.FileExists(path.Join(location.Directory, baseFileName+".ecx")) {
-			// write .ec01 ~ .ec14 files
+			// write .ec00 ~ .ec13 files
 			baseFileName = path.Join(location.Directory, baseFileName)
 			if generatedShardIds, err := erasure_coding.RebuildEcFiles(baseFileName); err != nil {
 				return nil, fmt.Errorf("RebuildEcFiles %s: %v", baseFileName, err)
@@ -103,25 +104,26 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 
 		// copy ec data slices
 		for _, shardId := range req.ShardIds {
-			if err := vs.doCopyFile(ctx, client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, erasure_coding.ToExt(int(shardId)), false); err != nil {
+			if err := vs.doCopyFile(ctx, client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, erasure_coding.ToExt(int(shardId)), false, false); err != nil {
 				return err
 			}
 		}
 
-		if !req.CopyEcxFile {
-			return nil
-		}
+		if req.CopyEcxFile {
 
-		// copy ecx file
-		if err := vs.doCopyFile(ctx, client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, ".ecx", false); err != nil {
-			return err
+			// copy ecx file
+			if err := vs.doCopyFile(ctx, client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, ".ecx", false, false); err != nil {
+				return err
+			}
+			return nil
 		}
 
-		// copy ecj file
-		if err := vs.doCopyFile(ctx, client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, ".ecj", true); err != nil {
-			return err
+		if req.CopyEcjFile {
+			// copy ecj file
+			if err := vs.doCopyFile(ctx, client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, ".ecj", true, true); err != nil {
+				return err
+			}
 		}
-
 		return nil
 	})
 	if err != nil {
@@ -137,6 +139,8 @@ func (vs *VolumeServer) VolumeEcShardsDelete(ctx context.Context, req *volume_se
 
 	baseFilename := erasure_coding.EcShardBaseFileName(req.Collection, int(req.VolumeId))
 
+	glog.V(0).Infof("ec volume %d shard delete %v", req.VolumeId, req.ShardIds)
+
 	found := false
 	for _, location := range vs.store.Locations {
 		if util.FileExists(path.Join(location.Directory, baseFilename+".ecx")) {
@@ -153,21 +157,22 @@ func (vs *VolumeServer) VolumeEcShardsDelete(ctx context.Context, req *volume_se
 		return nil, nil
 	}
 
-	// check whether to delete the ecx file also
+	// check whether to delete the .ecx and .ecj file also
 	hasEcxFile := false
 	existingShardCount := 0
 
+	bName := filepath.Base(baseFilename)
 	for _, location := range vs.store.Locations {
 		fileInfos, err := ioutil.ReadDir(location.Directory)
 		if err != nil {
 			continue
 		}
 		for _, fileInfo := range fileInfos {
-			if fileInfo.Name() == baseFilename+".ecx" {
+			if fileInfo.Name() == bName+".ecx" || fileInfo.Name() == bName+".ecj"{
 				hasEcxFile = true
 				continue
 			}
-			if strings.HasPrefix(fileInfo.Name(), baseFilename+".ec") {
+			if strings.HasPrefix(fileInfo.Name(), bName+".ec") {
 				existingShardCount++
 			}
 		}
@@ -317,3 +322,35 @@ func (vs *VolumeServer) VolumeEcBlobDelete(ctx context.Context, req *volume_serv
 
 	return resp, nil
 }
+
+// VolumeEcShardsToVolume generates the .idx, .dat files from .ecx, .ecj and .ec01 ~ .ec14 files
+func (vs *VolumeServer) VolumeEcShardsToVolume(ctx context.Context, req *volume_server_pb.VolumeEcShardsToVolumeRequest) (*volume_server_pb.VolumeEcShardsToVolumeResponse, error) {
+
+	v, found := vs.store.FindEcVolume(needle.VolumeId(req.VolumeId))
+	if !found {
+		return nil, fmt.Errorf("ec volume %d not found", req.VolumeId)
+	}
+	baseFileName := v.FileName()
+
+	if v.Collection != req.Collection {
+		return nil, fmt.Errorf("existing collection:%v unexpected input: %v", v.Collection, req.Collection)
+	}
+
+	// calculate .dat file size
+	datFileSize, err := erasure_coding.FindDatFileSize(baseFileName)
+	if err != nil {
+		return nil, fmt.Errorf("FindDatFileSize %s: %v", baseFileName, err)
+	}
+
+	// write .dat file from .ec00 ~ .ec09 files
+	if err := erasure_coding.WriteDatFile(baseFileName, datFileSize); err != nil {
+		return nil, fmt.Errorf("WriteEcFiles %s: %v", baseFileName, err)
+	}
+
+	// write .idx file from .ecx and .ecj files
+	if err := erasure_coding.WriteIdxFileFromEcIndex(baseFileName); err != nil {
+		return nil, fmt.Errorf("WriteIdxFileFromEcIndex %s: %v", baseFileName, err)
+	}
+
+	return &volume_server_pb.VolumeEcShardsToVolumeResponse{}, nil
+}
diff --git a/weed/server/volume_grpc_tail.go b/weed/server/volume_grpc_tail.go
index 1bf61e1c7..c26d6ed8f 100644
--- a/weed/server/volume_grpc_tail.go
+++ b/weed/server/volume_grpc_tail.go
@@ -10,6 +10,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
 func (vs *VolumeServer) VolumeTailSender(req *volume_server_pb.VolumeTailSenderRequest, stream volume_server_pb.VolumeServer_VolumeTailSenderServer) error {
@@ -101,7 +102,7 @@ type VolumeFileScanner4Tailing struct {
 	lastProcessedTimestampNs uint64
 }
 
-func (scanner *VolumeFileScanner4Tailing) VisitSuperBlock(superBlock storage.SuperBlock) error {
+func (scanner *VolumeFileScanner4Tailing) VisitSuperBlock(superBlock super_block.SuperBlock) error {
 	return nil
 
 }
diff --git a/weed/shell/command_ec_common.go b/weed/shell/command_ec_common.go
index cfe14fed5..8db811510 100644
--- a/weed/shell/command_ec_common.go
+++ b/weed/shell/command_ec_common.go
@@ -70,6 +70,7 @@ func oneServerCopyAndMountEcShardsFromSource(ctx context.Context, grpcDialOption
 				Collection:     collection,
 				ShardIds:       shardIdsToCopy,
 				CopyEcxFile:    true,
+				CopyEcjFile:    true,
 				SourceDataNode: existingLocation,
 			})
 			if copyErr != nil {
diff --git a/weed/shell/command_ec_decode.go b/weed/shell/command_ec_decode.go
new file mode 100644
index 000000000..5ea359b2b
--- /dev/null
+++ b/weed/shell/command_ec_decode.go
@@ -0,0 +1,263 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io"
+
+	"google.golang.org/grpc"
+
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+)
+
+func init() {
+	Commands = append(Commands, &commandEcDecode{})
+}
+
+type commandEcDecode struct {
+}
+
+func (c *commandEcDecode) Name() string {
+	return "ec.decode"
+}
+
+func (c *commandEcDecode) Help() string {
+	return `decode a erasure coded volume into a normal volume
+
+	ec.decode [-collection=""] [-volumeId=<volume_id>]
+
+`
+}
+
+func (c *commandEcDecode) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	encodeCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	volumeId := encodeCommand.Int("volumeId", 0, "the volume id")
+	collection := encodeCommand.String("collection", "", "the collection name")
+	if err = encodeCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	ctx := context.Background()
+	vid := needle.VolumeId(*volumeId)
+
+	// collect topology information
+	topologyInfo, err := collectTopologyInfoForEcDecode(ctx, commandEnv)
+	if err != nil {
+		return err
+	}
+
+	// volumeId is provided
+	if vid != 0 {
+		return doEcDecode(ctx, commandEnv, topologyInfo, *collection, vid)
+	}
+
+	// apply to all volumes in the collection
+	volumeIds := collectEcShardIds(topologyInfo, *collection)
+	fmt.Printf("ec encode volumes: %v\n", volumeIds)
+	for _, vid := range volumeIds {
+		if err = doEcDecode(ctx, commandEnv, topologyInfo, *collection, vid); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func doEcDecode(ctx context.Context, commandEnv *CommandEnv, topoInfo *master_pb.TopologyInfo, collection string, vid needle.VolumeId) (err error) {
+	// find volume location
+	nodeToEcIndexBits := collectEcNodeShardBits(topoInfo, vid)
+
+	fmt.Printf("ec volume %d shard locations: %+v\n", vid, nodeToEcIndexBits)
+
+	// collect ec shards to the server with most space
+	targetNodeLocation, err := collectEcShards(ctx, commandEnv, nodeToEcIndexBits, collection, vid)
+	if err != nil {
+		return fmt.Errorf("collectEcShards for volume %d: %v", vid, err)
+	}
+
+	// generate a normal volume
+	err = generateNormalVolume(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(vid), collection, targetNodeLocation)
+	if err != nil {
+		return fmt.Errorf("generate normal volume %d on %s: %v", vid, targetNodeLocation, err)
+	}
+
+	// delete the previous ec shards
+	err = mountVolumeAndDeleteEcShards(ctx, commandEnv.option.GrpcDialOption, collection, targetNodeLocation, nodeToEcIndexBits, vid)
+	if err != nil {
+		return fmt.Errorf("delete ec shards for volume %d: %v", vid, err)
+	}
+
+	return nil
+}
+
+func mountVolumeAndDeleteEcShards(ctx context.Context, grpcDialOption grpc.DialOption, collection, targetNodeLocation string, nodeToEcIndexBits map[string]erasure_coding.ShardBits, vid needle.VolumeId) error {
+
+	// mount volume
+	if err := operation.WithVolumeServerClient(targetNodeLocation, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		_, mountErr := volumeServerClient.VolumeMount(ctx, &volume_server_pb.VolumeMountRequest{
+			VolumeId: uint32(vid),
+		})
+		return mountErr
+	}); err != nil {
+		return fmt.Errorf("mountVolumeAndDeleteEcShards mount volume %d on %s: %v", vid, targetNodeLocation, err)
+	}
+
+	// unmount ec shards
+	for location, ecIndexBits := range nodeToEcIndexBits {
+		fmt.Printf("unmount ec volume %d on %s has shards: %+v\n", vid, location, ecIndexBits.ShardIds())
+		err := unmountEcShards(ctx, grpcDialOption, vid, location, ecIndexBits.ToUint32Slice())
+		if err != nil {
+			return fmt.Errorf("mountVolumeAndDeleteEcShards unmount ec volume %d on %s: %v", vid, location, err)
+		}
+	}
+	// delete ec shards
+	for location, ecIndexBits := range nodeToEcIndexBits {
+		fmt.Printf("delete ec volume %d on %s has shards: %+v\n", vid, location, ecIndexBits.ShardIds())
+		err := sourceServerDeleteEcShards(ctx, grpcDialOption, collection, vid, location, ecIndexBits.ToUint32Slice())
+		if err != nil {
+			return fmt.Errorf("mountVolumeAndDeleteEcShards delete ec volume %d on %s: %v", vid, location, err)
+		}
+	}
+
+	return nil
+}
+
+func generateNormalVolume(ctx context.Context, grpcDialOption grpc.DialOption, vid needle.VolumeId, collection string, sourceVolumeServer string) error {
+
+	fmt.Printf("generateNormalVolume from ec volume %d on %s\n", vid, sourceVolumeServer)
+
+	err := operation.WithVolumeServerClient(sourceVolumeServer, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		_, genErr := volumeServerClient.VolumeEcShardsToVolume(ctx, &volume_server_pb.VolumeEcShardsToVolumeRequest{
+			VolumeId:   uint32(vid),
+			Collection: collection,
+		})
+		return genErr
+	})
+
+	return err
+
+}
+
+func collectEcShards(ctx context.Context, commandEnv *CommandEnv, nodeToEcIndexBits map[string]erasure_coding.ShardBits, collection string, vid needle.VolumeId) (targetNodeLocation string, err error) {
+
+	maxShardCount := 0
+	var exisitngEcIndexBits erasure_coding.ShardBits
+	for loc, ecIndexBits := range nodeToEcIndexBits {
+		if ecIndexBits.ShardIdCount() > maxShardCount {
+			maxShardCount = ecIndexBits.ShardIdCount()
+			targetNodeLocation = loc
+			exisitngEcIndexBits = ecIndexBits
+		}
+	}
+
+	fmt.Printf("collectEcShards: ec volume %d collect shards to %s from: %+v\n", vid, targetNodeLocation, nodeToEcIndexBits)
+
+	var copiedEcIndexBits erasure_coding.ShardBits
+	for loc, ecIndexBits := range nodeToEcIndexBits {
+		if loc == targetNodeLocation {
+			continue
+		}
+
+		needToCopyEcIndexBits := ecIndexBits.Minus(exisitngEcIndexBits)
+		if needToCopyEcIndexBits.ShardIdCount() == 0 {
+			continue
+		}
+
+		err = operation.WithVolumeServerClient(targetNodeLocation, commandEnv.option.GrpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+
+			fmt.Printf("copy %d.%v %s => %s\n", vid, needToCopyEcIndexBits.ShardIds(), loc, targetNodeLocation)
+
+			_, copyErr := volumeServerClient.VolumeEcShardsCopy(ctx, &volume_server_pb.VolumeEcShardsCopyRequest{
+				VolumeId:       uint32(vid),
+				Collection:     collection,
+				ShardIds:       needToCopyEcIndexBits.ToUint32Slice(),
+				CopyEcxFile:    false,
+				CopyEcjFile:    true,
+				SourceDataNode: loc,
+			})
+			if copyErr != nil {
+				return fmt.Errorf("copy %d.%v %s => %s : %v\n", vid, needToCopyEcIndexBits.ShardIds(), loc, targetNodeLocation, copyErr)
+			}
+
+			return nil
+		})
+
+		if err != nil {
+			break
+		}
+
+		copiedEcIndexBits = copiedEcIndexBits.Plus(needToCopyEcIndexBits)
+
+	}
+
+	nodeToEcIndexBits[targetNodeLocation] = exisitngEcIndexBits.Plus(copiedEcIndexBits)
+
+	return targetNodeLocation, err
+
+}
+
+func collectTopologyInfoForEcDecode(ctx context.Context, commandEnv *CommandEnv) (topoInfo *master_pb.TopologyInfo, err error) {
+
+	var resp *master_pb.VolumeListResponse
+	err = commandEnv.MasterClient.WithClient(ctx, func(client master_pb.SeaweedClient) error {
+		resp, err = client.VolumeList(ctx, &master_pb.VolumeListRequest{})
+		return err
+	})
+	if err != nil {
+		return
+	}
+
+	return resp.TopologyInfo, nil
+
+}
+
+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)
+			}
+		}
+	})
+
+	return
+}
+
+func collectEcShardIds(topoInfo *master_pb.TopologyInfo, selectedCollection string) (vids []needle.VolumeId) {
+
+	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
+			}
+		}
+	})
+
+	for vid := range vidMap {
+		vids = append(vids, needle.VolumeId(vid))
+	}
+
+	return
+}
+
+func collectEcNodeShardBits(topoInfo *master_pb.TopologyInfo, vid needle.VolumeId) map[string]erasure_coding.ShardBits {
+
+	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)
+			}
+		}
+	})
+
+	return nodeToEcIndexBits
+}
diff --git a/weed/shell/command_ec_rebuild.go b/weed/shell/command_ec_rebuild.go
index b43aed599..08732a309 100644
--- a/weed/shell/command_ec_rebuild.go
+++ b/weed/shell/command_ec_rebuild.go
@@ -215,6 +215,7 @@ func prepareDataToRecover(ctx context.Context, commandEnv *CommandEnv, rebuilder
 					Collection:     collection,
 					ShardIds:       []uint32{uint32(shardId)},
 					CopyEcxFile:    needEcxFile,
+					CopyEcjFile:    needEcxFile,
 					SourceDataNode: ecNodes[0].info.Id,
 				})
 				return copyErr
diff --git a/weed/shell/command_volume_fix_replication.go b/weed/shell/command_volume_fix_replication.go
index 4c7a794c0..6f35dd5d2 100644
--- a/weed/shell/command_volume_fix_replication.go
+++ b/weed/shell/command_volume_fix_replication.go
@@ -3,13 +3,14 @@ package shell
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/operation"
-	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
-	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
-	"github.com/chrislusf/seaweedfs/weed/storage"
 	"io"
 	"math/rand"
 	"sort"
+
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
 func init() {
@@ -78,7 +79,7 @@ func (c *commandVolumeFixReplication) Do(args []string, commandEnv *CommandEnv,
 	underReplicatedVolumeLocations := make(map[uint32][]location)
 	for vid, locations := range replicatedVolumeLocations {
 		volumeInfo := replicatedVolumeInfo[vid]
-		replicaPlacement, _ := storage.NewReplicaPlacementFromByte(byte(volumeInfo.ReplicaPlacement))
+		replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(volumeInfo.ReplicaPlacement))
 		if replicaPlacement.GetCopyCount() > len(locations) {
 			underReplicatedVolumeLocations[vid] = locations
 		}
@@ -97,7 +98,7 @@ func (c *commandVolumeFixReplication) Do(args []string, commandEnv *CommandEnv,
 
 	for vid, locations := range underReplicatedVolumeLocations {
 		volumeInfo := replicatedVolumeInfo[vid]
-		replicaPlacement, _ := storage.NewReplicaPlacementFromByte(byte(volumeInfo.ReplicaPlacement))
+		replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(volumeInfo.ReplicaPlacement))
 		foundNewLocation := false
 		for _, dst := range allLocations {
 			// check whether data nodes satisfy the constraints
@@ -145,7 +146,7 @@ func keepDataNodesSorted(dataNodes []location) {
 	})
 }
 
-func satisfyReplicaPlacement(replicaPlacement *storage.ReplicaPlacement, existingLocations []location, possibleLocation location) bool {
+func satisfyReplicaPlacement(replicaPlacement *super_block.ReplicaPlacement, existingLocations []location, possibleLocation location) bool {
 
 	existingDataCenters := make(map[string]bool)
 	existingRacks := make(map[string]bool)
diff --git a/weed/storage/erasure_coding/ec_decoder.go b/weed/storage/erasure_coding/ec_decoder.go
new file mode 100644
index 000000000..ae77cee3f
--- /dev/null
+++ b/weed/storage/erasure_coding/ec_decoder.go
@@ -0,0 +1,198 @@
+package erasure_coding
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/chrislusf/seaweedfs/weed/storage/backend"
+	"github.com/chrislusf/seaweedfs/weed/storage/idx"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+)
+
+// write .idx file from .ecx and .ecj files
+func WriteIdxFileFromEcIndex(baseFileName string) (err error) {
+
+	ecxFile, openErr := os.OpenFile(baseFileName+".ecx", os.O_RDONLY, 0644)
+	if openErr != nil {
+		return fmt.Errorf("cannot open ec index %s.ecx: %v", baseFileName, openErr)
+	}
+	defer ecxFile.Close()
+
+	idxFile, openErr := os.OpenFile(baseFileName+".idx", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+	if openErr != nil {
+		return fmt.Errorf("cannot open %s.idx: %v", baseFileName, openErr)
+	}
+	defer idxFile.Close()
+
+	io.Copy(idxFile, ecxFile)
+
+	err = iterateEcjFile(baseFileName, func(key types.NeedleId) error {
+
+		bytes := needle_map.ToBytes(key, types.Offset{}, types.TombstoneFileSize)
+		idxFile.Write(bytes)
+
+		return nil
+	})
+
+	return err
+}
+
+// FindDatFileSize calculate .dat file size from max offset entry
+// there may be extra deletions after that entry
+// but they are deletions anyway
+func FindDatFileSize(baseFileName string) (datSize int64, err error) {
+
+	version, err := readEcVolumeVersion(baseFileName)
+	if err != nil {
+		return 0, fmt.Errorf("read ec volume %s version: %v", baseFileName, err)
+	}
+
+	err = iterateEcxFile(baseFileName, func(key types.NeedleId, offset types.Offset, size uint32) error {
+
+		if size == types.TombstoneFileSize {
+			return nil
+		}
+
+		entryStopOffset := offset.ToAcutalOffset() + needle.GetActualSize(size, version)
+		if datSize < entryStopOffset {
+			datSize = entryStopOffset
+		}
+
+		return nil
+	})
+
+	return
+}
+
+func readEcVolumeVersion(baseFileName string) (version needle.Version, err error) {
+
+	// find volume version
+	datFile, err := os.OpenFile(baseFileName+".ec00", os.O_RDONLY, 0644)
+	if err != nil {
+		return 0, fmt.Errorf("open ec volume %s superblock: %v", baseFileName, err)
+	}
+	datBackend := backend.NewDiskFile(datFile)
+
+	superBlock, err := super_block.ReadSuperBlock(datBackend)
+	datBackend.Close()
+	if err != nil {
+		return 0, fmt.Errorf("read ec volume %s superblock: %v", baseFileName, err)
+	}
+
+	return superBlock.Version, nil
+
+}
+
+func iterateEcxFile(baseFileName string, processNeedleFn func(key types.NeedleId, offset types.Offset, size uint32) error) error {
+	ecxFile, openErr := os.OpenFile(baseFileName+".ecx", os.O_RDONLY, 0644)
+	if openErr != nil {
+		return fmt.Errorf("cannot open ec index %s.ecx: %v", baseFileName, openErr)
+	}
+	defer ecxFile.Close()
+
+	buf := make([]byte, types.NeedleMapEntrySize)
+	for {
+		n, err := ecxFile.Read(buf)
+		if n != types.NeedleMapEntrySize {
+			if err == io.EOF {
+				return nil
+			}
+			return err
+		}
+		key, offset, size := idx.IdxFileEntry(buf)
+		if processNeedleFn != nil {
+			err = processNeedleFn(key, offset, size)
+		}
+		if err != nil {
+			if err != io.EOF {
+				return err
+			}
+			return nil
+		}
+	}
+
+}
+
+func iterateEcjFile(baseFileName string, processNeedleFn func(key types.NeedleId) error) error {
+	ecjFile, openErr := os.OpenFile(baseFileName+".ecj", os.O_RDONLY, 0644)
+	if openErr != nil {
+		return fmt.Errorf("cannot open ec index %s.ecx: %v", baseFileName, openErr)
+	}
+	defer ecjFile.Close()
+
+	buf := make([]byte, types.NeedleIdSize)
+	for {
+		n, err := ecjFile.Read(buf)
+		if n != types.NeedleIdSize {
+			if err == io.EOF {
+				return nil
+			}
+			return err
+		}
+		if processNeedleFn != nil {
+			err = processNeedleFn(types.BytesToNeedleId(buf))
+		}
+		if err != nil {
+			if err == io.EOF {
+				return nil
+			}
+			return err
+		}
+	}
+
+}
+
+// WriteDatFile generates .dat from from .ec00 ~ .ec09 files
+func WriteDatFile(baseFileName string, datFileSize int64) error {
+
+	datFile, openErr := os.OpenFile(baseFileName+".dat", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+	if openErr != nil {
+		return fmt.Errorf("cannot write volume %s.dat: %v", baseFileName, openErr)
+	}
+	defer datFile.Close()
+
+	inputFiles := make([]*os.File, DataShardsCount)
+
+	for shardId := 0; shardId < DataShardsCount; shardId++ {
+		shardFileName := baseFileName + ToExt(shardId)
+		inputFiles[shardId], openErr = os.OpenFile(shardFileName, os.O_RDONLY, 0)
+		if openErr != nil {
+			return openErr
+		}
+		defer inputFiles[shardId].Close()
+	}
+
+	for datFileSize >= DataShardsCount*ErasureCodingLargeBlockSize {
+		for shardId := 0; shardId < DataShardsCount; shardId++ {
+			w, err := io.CopyN(datFile, inputFiles[shardId], ErasureCodingLargeBlockSize)
+			if w != ErasureCodingLargeBlockSize {
+				return fmt.Errorf("copy %s large block %d: %v", baseFileName, shardId, err)
+			}
+			datFileSize -= ErasureCodingLargeBlockSize
+		}
+	}
+
+	for datFileSize > 0 {
+		for shardId := 0; shardId < DataShardsCount; shardId++ {
+			toRead := min(datFileSize, ErasureCodingSmallBlockSize)
+			w, err := io.CopyN(datFile, inputFiles[shardId], toRead)
+			if w != toRead {
+				return fmt.Errorf("copy %s small block %d: %v", baseFileName, shardId, err)
+			}
+			datFileSize -= toRead
+		}
+	}
+
+	return nil
+}
+
+func min(x, y int64) int64 {
+	if x > y {
+		return y
+	}
+	return x
+}
diff --git a/weed/storage/erasure_coding/ec_encoder.go b/weed/storage/erasure_coding/ec_encoder.go
index 75369dc8d..eeb384b91 100644
--- a/weed/storage/erasure_coding/ec_encoder.go
+++ b/weed/storage/erasure_coding/ec_encoder.go
@@ -49,7 +49,7 @@ func WriteSortedFileFromIdx(baseFileName string, ext string) (e error) {
 	return nil
 }
 
-// WriteEcFiles generates .ec01 ~ .ec14 files
+// WriteEcFiles generates .ec00 ~ .ec13 files
 func WriteEcFiles(baseFileName string) error {
 	return generateEcFiles(baseFileName, 256*1024, ErasureCodingLargeBlockSize, ErasureCodingSmallBlockSize)
 }
diff --git a/weed/storage/erasure_coding/ec_volume_info.go b/weed/storage/erasure_coding/ec_volume_info.go
index c9e85c662..bb1fd0bf8 100644
--- a/weed/storage/erasure_coding/ec_volume_info.go
+++ b/weed/storage/erasure_coding/ec_volume_info.go
@@ -81,6 +81,15 @@ func (b ShardBits) ShardIds() (ret []ShardId) {
 	return
 }
 
+func (b ShardBits) ToUint32Slice() (ret []uint32) {
+	for i := uint32(0); i < TotalShardsCount; i++ {
+		if b.HasShardId(ShardId(i)) {
+			ret = append(ret, i)
+		}
+	}
+	return
+}
+
 func (b ShardBits) ShardIdCount() (count int) {
 	for count = 0; b > 0; count++ {
 		b &= b - 1
diff --git a/weed/storage/store.go b/weed/storage/store.go
index 1ef97bbea..512f72ceb 100644
--- a/weed/storage/store.go
+++ b/weed/storage/store.go
@@ -10,6 +10,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
 )
 
@@ -61,7 +62,7 @@ func NewStore(grpcDialOption grpc.DialOption, port int, ip, publicUrl string, di
 	return
 }
 func (s *Store) AddVolume(volumeId needle.VolumeId, collection string, needleMapKind NeedleMapType, replicaPlacement string, ttlString string, preallocate int64, MemoryMapMaxSizeMb uint32) error {
-	rt, e := NewReplicaPlacementFromString(replicaPlacement)
+	rt, e := super_block.NewReplicaPlacementFromString(replicaPlacement)
 	if e != nil {
 		return e
 	}
@@ -102,7 +103,7 @@ func (s *Store) FindFreeLocation() (ret *DiskLocation) {
 	}
 	return ret
 }
-func (s *Store) addVolume(vid needle.VolumeId, collection string, needleMapKind NeedleMapType, replicaPlacement *ReplicaPlacement, ttl *needle.TTL, preallocate int64, memoryMapMaxSizeMb uint32) error {
+func (s *Store) addVolume(vid needle.VolumeId, collection string, needleMapKind NeedleMapType, replicaPlacement *super_block.ReplicaPlacement, ttl *needle.TTL, preallocate int64, memoryMapMaxSizeMb uint32) error {
 	if s.findVolume(vid) != nil {
 		return fmt.Errorf("Volume Id %d already exists!", vid)
 	}
@@ -229,7 +230,7 @@ func (s *Store) WriteVolumeNeedle(i needle.VolumeId, n *needle.Needle) (size uin
 			err = fmt.Errorf("volume %d is read only", i)
 			return
 		}
-		if MaxPossibleVolumeSize >= v.ContentSize()+uint64(needle.GetActualSize(size, v.version)) {
+		if MaxPossibleVolumeSize >= v.ContentSize()+uint64(needle.GetActualSize(size, v.Version())) {
 			_, size, isUnchanged, err = v.writeNeedle(n)
 		} else {
 			err = fmt.Errorf("volume size limit %d exceeded! current size is %d", s.GetVolumeSizeLimit(), v.ContentSize())
@@ -246,7 +247,7 @@ func (s *Store) DeleteVolumeNeedle(i needle.VolumeId, n *needle.Needle) (uint32,
 		if v.noWriteOrDelete {
 			return 0, fmt.Errorf("volume %d is read only", i)
 		}
-		if MaxPossibleVolumeSize >= v.ContentSize()+uint64(needle.GetActualSize(0, v.version)) {
+		if MaxPossibleVolumeSize >= v.ContentSize()+uint64(needle.GetActualSize(0, v.Version())) {
 			return v.deleteNeedle(n)
 		} else {
 			return 0, fmt.Errorf("volume size limit %d exceeded! current size is %d", s.GetVolumeSizeLimit(), v.ContentSize())
diff --git a/weed/storage/store_ec.go b/weed/storage/store_ec.go
index 208560b7e..4c160d2d8 100644
--- a/weed/storage/store_ec.go
+++ b/weed/storage/store_ec.go
@@ -8,6 +8,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/klauspost/reedsolomon"
+
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
@@ -15,8 +17,8 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"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"
-	"github.com/klauspost/reedsolomon"
 )
 
 func (s *Store) CollectErasureCodingHeartbeat() *master_pb.Heartbeat {
@@ -169,7 +171,7 @@ func (s *Store) readEcVolumeVersion(ctx context.Context, vid needle.VolumeId, ec
 	interval := erasure_coding.Interval{
 		BlockIndex:          0,
 		InnerBlockOffset:    0,
-		Size:                _SuperBlockSize,
+		Size:                super_block.SuperBlockSize,
 		IsLargeBlock:        true, // it could be large block, but ok in this place
 		LargeBlockRowsCount: 0,
 	}
diff --git a/weed/storage/replica_placement.go b/weed/storage/super_block/replica_placement.go
similarity index 98%
rename from weed/storage/replica_placement.go
rename to weed/storage/super_block/replica_placement.go
index c1aca52eb..fcccbba7d 100644
--- a/weed/storage/replica_placement.go
+++ b/weed/storage/super_block/replica_placement.go
@@ -1,4 +1,4 @@
-package storage
+package super_block
 
 import (
 	"errors"
diff --git a/weed/storage/replica_placement_test.go b/weed/storage/super_block/replica_placement_test.go
similarity index 93%
rename from weed/storage/replica_placement_test.go
rename to weed/storage/super_block/replica_placement_test.go
index 7968af7cb..7742ba548 100644
--- a/weed/storage/replica_placement_test.go
+++ b/weed/storage/super_block/replica_placement_test.go
@@ -1,4 +1,4 @@
-package storage
+package super_block
 
 import (
 	"testing"
diff --git a/weed/storage/super_block/super_block.go b/weed/storage/super_block/super_block.go
new file mode 100644
index 000000000..f48cd0bdc
--- /dev/null
+++ b/weed/storage/super_block/super_block.go
@@ -0,0 +1,69 @@
+package super_block
+
+import (
+	"github.com/golang/protobuf/proto"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+const (
+	SuperBlockSize = 8
+)
+
+/*
+* Super block currently has 8 bytes allocated for each volume.
+* Byte 0: version, 1 or 2
+* Byte 1: Replica Placement strategy, 000, 001, 002, 010, etc
+* Byte 2 and byte 3: Time to live. See TTL for definition
+* Byte 4 and byte 5: The number of times the volume has been compacted.
+* Rest bytes: Reserved
+ */
+type SuperBlock struct {
+	Version            needle.Version
+	ReplicaPlacement   *ReplicaPlacement
+	Ttl                *needle.TTL
+	CompactionRevision uint16
+	Extra              *master_pb.SuperBlockExtra
+	ExtraSize          uint16
+}
+
+func (s *SuperBlock) BlockSize() int {
+	switch s.Version {
+	case needle.Version2, needle.Version3:
+		return SuperBlockSize + int(s.ExtraSize)
+	}
+	return SuperBlockSize
+}
+
+func (s *SuperBlock) Bytes() []byte {
+	header := make([]byte, SuperBlockSize)
+	header[0] = byte(s.Version)
+	header[1] = s.ReplicaPlacement.Byte()
+	s.Ttl.ToBytes(header[2:4])
+	util.Uint16toBytes(header[4:6], s.CompactionRevision)
+
+	if s.Extra != nil {
+		extraData, err := proto.Marshal(s.Extra)
+		if err != nil {
+			glog.Fatalf("cannot marshal super block extra %+v: %v", s.Extra, err)
+		}
+		extraSize := len(extraData)
+		if extraSize > 256*256-2 {
+			// reserve a couple of bits for future extension
+			glog.Fatalf("super block extra size is %d bigger than %d", extraSize, 256*256-2)
+		}
+		s.ExtraSize = uint16(extraSize)
+		util.Uint16toBytes(header[6:8], s.ExtraSize)
+
+		header = append(header, extraData...)
+	}
+
+	return header
+}
+
+func (s *SuperBlock) Initialized() bool {
+	return s.ReplicaPlacement != nil && s.Ttl != nil
+}
diff --git a/weed/storage/super_block/super_block_read.go.go b/weed/storage/super_block/super_block_read.go.go
new file mode 100644
index 000000000..9eb12e116
--- /dev/null
+++ b/weed/storage/super_block/super_block_read.go.go
@@ -0,0 +1,44 @@
+package super_block
+
+import (
+	"fmt"
+
+	"github.com/golang/protobuf/proto"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/backend"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+// ReadSuperBlock reads from data file and load it into volume's super block
+func ReadSuperBlock(datBackend backend.BackendStorageFile) (superBlock SuperBlock, err error) {
+
+	header := make([]byte, SuperBlockSize)
+	if _, e := datBackend.ReadAt(header, 0); e != nil {
+		err = fmt.Errorf("cannot read volume %s super block: %v", datBackend.Name(), e)
+		return
+	}
+
+	superBlock.Version = needle.Version(header[0])
+	if superBlock.ReplicaPlacement, err = NewReplicaPlacementFromByte(header[1]); err != nil {
+		err = fmt.Errorf("cannot read replica type: %s", err.Error())
+		return
+	}
+	superBlock.Ttl = needle.LoadTTLFromBytes(header[2:4])
+	superBlock.CompactionRevision = util.BytesToUint16(header[4:6])
+	superBlock.ExtraSize = util.BytesToUint16(header[6:8])
+
+	if superBlock.ExtraSize > 0 {
+		// read more
+		extraData := make([]byte, int(superBlock.ExtraSize))
+		superBlock.Extra = &master_pb.SuperBlockExtra{}
+		err = proto.Unmarshal(extraData, superBlock.Extra)
+		if err != nil {
+			err = fmt.Errorf("cannot read volume %s super block extra: %v", datBackend.Name(), err)
+			return
+		}
+	}
+
+	return
+}
diff --git a/weed/storage/volume_super_block_test.go b/weed/storage/super_block/super_block_test.go
similarity index 86%
rename from weed/storage/volume_super_block_test.go
rename to weed/storage/super_block/super_block_test.go
index 06ad8a5d3..25699070d 100644
--- a/weed/storage/volume_super_block_test.go
+++ b/weed/storage/super_block/super_block_test.go
@@ -1,4 +1,4 @@
-package storage
+package super_block
 
 import (
 	"testing"
@@ -10,7 +10,7 @@ func TestSuperBlockReadWrite(t *testing.T) {
 	rp, _ := NewReplicaPlacementFromByte(byte(001))
 	ttl, _ := needle.ReadTTL("15d")
 	s := &SuperBlock{
-		version:          needle.CurrentVersion,
+		Version:          needle.CurrentVersion,
 		ReplicaPlacement: rp,
 		Ttl:              ttl,
 	}
diff --git a/weed/storage/volume.go b/weed/storage/volume.go
index c92822e5c..eaeed4e77 100644
--- a/weed/storage/volume.go
+++ b/weed/storage/volume.go
@@ -12,6 +12,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -28,7 +29,7 @@ type Volume struct {
 	noWriteCanDelete   bool // if readonly, either noWriteOrDelete or noWriteCanDelete
 	MemoryMapMaxSizeMb uint32
 
-	SuperBlock
+	super_block.SuperBlock
 
 	dataFileAccessLock    sync.RWMutex
 	lastModifiedTsSeconds uint64 //unix time in seconds
@@ -42,10 +43,10 @@ type Volume struct {
 	volumeTierInfo *volume_server_pb.VolumeTierInfo
 }
 
-func NewVolume(dirname string, collection string, id needle.VolumeId, needleMapKind NeedleMapType, replicaPlacement *ReplicaPlacement, ttl *needle.TTL, preallocate int64, memoryMapMaxSizeMb uint32) (v *Volume, e error) {
+func NewVolume(dirname string, collection string, id needle.VolumeId, needleMapKind NeedleMapType, replicaPlacement *super_block.ReplicaPlacement, ttl *needle.TTL, preallocate int64, memoryMapMaxSizeMb uint32) (v *Volume, e error) {
 	// if replicaPlacement is nil, the superblock will be loaded from disk
 	v = &Volume{dir: dirname, Collection: collection, Id: id, MemoryMapMaxSizeMb: memoryMapMaxSizeMb}
-	v.SuperBlock = SuperBlock{ReplicaPlacement: replicaPlacement, Ttl: ttl}
+	v.SuperBlock = super_block.SuperBlock{ReplicaPlacement: replicaPlacement, Ttl: ttl}
 	v.needleMapKind = needleMapKind
 	e = v.load(true, true, needleMapKind, preallocate)
 	return
@@ -68,7 +69,7 @@ func (v *Volume) FileName() (fileName string) {
 }
 
 func (v *Volume) Version() needle.Version {
-	return v.SuperBlock.Version()
+	return v.SuperBlock.Version
 }
 
 func (v *Volume) FileStat() (datSize uint64, idxSize uint64, modTime time.Time) {
diff --git a/weed/storage/volume_backup.go b/weed/storage/volume_backup.go
index efe1345c6..ec29c895e 100644
--- a/weed/storage/volume_backup.go
+++ b/weed/storage/volume_backup.go
@@ -6,12 +6,14 @@ import (
 	"io"
 	"os"
 
+	"google.golang.org/grpc"
+
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/idx"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
-	"google.golang.org/grpc"
 )
 
 func (v *Volume) GetVolumeSyncStatus() *volume_server_pb.VolumeSyncStatusResponse {
@@ -108,7 +110,7 @@ func (v *Volume) IncrementalBackup(volumeServer string, grpcDialOption grpc.Dial
 	}
 
 	// add to needle map
-	return ScanVolumeFileFrom(v.version, v.DataBackend, int64(startFromOffset), &VolumeFileScanner4GenIdx{v: v})
+	return ScanVolumeFileFrom(v.Version(), v.DataBackend, int64(startFromOffset), &VolumeFileScanner4GenIdx{v: v})
 
 }
 
@@ -154,11 +156,11 @@ func (v *Volume) locateLastAppendEntry() (Offset, error) {
 
 func (v *Volume) readAppendAtNs(offset Offset) (uint64, error) {
 
-	n, _, bodyLength, err := needle.ReadNeedleHeader(v.DataBackend, v.SuperBlock.version, offset.ToAcutalOffset())
+	n, _, bodyLength, err := needle.ReadNeedleHeader(v.DataBackend, v.SuperBlock.Version, offset.ToAcutalOffset())
 	if err != nil {
 		return 0, fmt.Errorf("ReadNeedleHeader: %v", err)
 	}
-	_, err = n.ReadNeedleBody(v.DataBackend, v.SuperBlock.version, offset.ToAcutalOffset()+int64(NeedleHeaderSize), bodyLength)
+	_, err = n.ReadNeedleBody(v.DataBackend, v.SuperBlock.Version, offset.ToAcutalOffset()+int64(NeedleHeaderSize), bodyLength)
 	if err != nil {
 		return 0, fmt.Errorf("ReadNeedleBody offset %d, bodyLength %d: %v", offset.ToAcutalOffset(), bodyLength, err)
 	}
@@ -244,7 +246,7 @@ type VolumeFileScanner4GenIdx struct {
 	v *Volume
 }
 
-func (scanner *VolumeFileScanner4GenIdx) VisitSuperBlock(superBlock SuperBlock) error {
+func (scanner *VolumeFileScanner4GenIdx) VisitSuperBlock(superBlock super_block.SuperBlock) error {
 	return nil
 
 }
diff --git a/weed/storage/volume_info.go b/weed/storage/volume_info.go
index 3b9b667eb..313818cde 100644
--- a/weed/storage/volume_info.go
+++ b/weed/storage/volume_info.go
@@ -6,12 +6,13 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
 type VolumeInfo struct {
 	Id                needle.VolumeId
 	Size              uint64
-	ReplicaPlacement  *ReplicaPlacement
+	ReplicaPlacement  *super_block.ReplicaPlacement
 	Ttl               *needle.TTL
 	Collection        string
 	Version           needle.Version
@@ -40,7 +41,7 @@ func NewVolumeInfo(m *master_pb.VolumeInformationMessage) (vi VolumeInfo, err er
 		RemoteStorageName: m.RemoteStorageName,
 		RemoteStorageKey:  m.RemoteStorageKey,
 	}
-	rp, e := NewReplicaPlacementFromByte(byte(m.ReplicaPlacement))
+	rp, e := super_block.NewReplicaPlacementFromByte(byte(m.ReplicaPlacement))
 	if e != nil {
 		return vi, e
 	}
@@ -55,7 +56,7 @@ func NewVolumeInfoFromShort(m *master_pb.VolumeShortInformationMessage) (vi Volu
 		Collection: m.Collection,
 		Version:    needle.Version(m.Version),
 	}
-	rp, e := NewReplicaPlacementFromByte(byte(m.ReplicaPlacement))
+	rp, e := super_block.NewReplicaPlacementFromByte(byte(m.ReplicaPlacement))
 	if e != nil {
 		return vi, e
 	}
diff --git a/weed/storage/volume_loading.go b/weed/storage/volume_loading.go
index 5c1ac172a..eb177e850 100644
--- a/weed/storage/volume_loading.go
+++ b/weed/storage/volume_loading.go
@@ -11,11 +11,12 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
 func loadVolumeWithoutIndex(dirname string, collection string, id needle.VolumeId, needleMapKind NeedleMapType) (v *Volume, err error) {
 	v = &Volume{dir: dirname, Collection: collection, Id: id}
-	v.SuperBlock = SuperBlock{}
+	v.SuperBlock = super_block.SuperBlock{}
 	v.needleMapKind = needleMapKind
 	err = v.load(false, false, needleMapKind, 0)
 	return
@@ -43,7 +44,7 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind
 			v.noWriteOrDelete = true
 		}
 		v.lastModifiedTsSeconds = uint64(modifiedTime.Unix())
-		if fileSize >= _SuperBlockSize {
+		if fileSize >= super_block.SuperBlockSize {
 			alreadyHasSuperBlock = true
 		}
 		v.DataBackend = backend.NewDiskFile(dataFile)
diff --git a/weed/storage/volume_read_write.go b/weed/storage/volume_read_write.go
index 4eb04a13b..a08e64077 100644
--- a/weed/storage/volume_read_write.go
+++ b/weed/storage/volume_read_write.go
@@ -11,6 +11,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
 )
 
@@ -165,7 +166,7 @@ func (v *Volume) readNeedle(n *needle.Needle) (int, error) {
 }
 
 type VolumeFileScanner interface {
-	VisitSuperBlock(SuperBlock) error
+	VisitSuperBlock(super_block.SuperBlock) error
 	ReadNeedleBody() bool
 	VisitNeedle(n *needle.Needle, offset int64, needleHeader, needleBody []byte) error
 }
diff --git a/weed/storage/volume_super_block.go b/weed/storage/volume_super_block.go
index 519691260..61c09d85a 100644
--- a/weed/storage/volume_super_block.go
+++ b/weed/storage/volume_super_block.go
@@ -1,79 +1,14 @@
 package storage
 
 import (
-	"fmt"
 	"os"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
-	"github.com/chrislusf/seaweedfs/weed/util"
-	"github.com/golang/protobuf/proto"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
-const (
-	_SuperBlockSize = 8
-)
-
-/*
-* Super block currently has 8 bytes allocated for each volume.
-* Byte 0: version, 1 or 2
-* Byte 1: Replica Placement strategy, 000, 001, 002, 010, etc
-* Byte 2 and byte 3: Time to live. See TTL for definition
-* Byte 4 and byte 5: The number of times the volume has been compacted.
-* Rest bytes: Reserved
- */
-type SuperBlock struct {
-	version            needle.Version
-	ReplicaPlacement   *ReplicaPlacement
-	Ttl                *needle.TTL
-	CompactionRevision uint16
-	Extra              *master_pb.SuperBlockExtra
-	extraSize          uint16
-}
-
-func (s *SuperBlock) BlockSize() int {
-	switch s.version {
-	case needle.Version2, needle.Version3:
-		return _SuperBlockSize + int(s.extraSize)
-	}
-	return _SuperBlockSize
-}
-
-func (s *SuperBlock) Version() needle.Version {
-	return s.version
-}
-func (s *SuperBlock) Bytes() []byte {
-	header := make([]byte, _SuperBlockSize)
-	header[0] = byte(s.version)
-	header[1] = s.ReplicaPlacement.Byte()
-	s.Ttl.ToBytes(header[2:4])
-	util.Uint16toBytes(header[4:6], s.CompactionRevision)
-
-	if s.Extra != nil {
-		extraData, err := proto.Marshal(s.Extra)
-		if err != nil {
-			glog.Fatalf("cannot marshal super block extra %+v: %v", s.Extra, err)
-		}
-		extraSize := len(extraData)
-		if extraSize > 256*256-2 {
-			// reserve a couple of bits for future extension
-			glog.Fatalf("super block extra size is %d bigger than %d", extraSize, 256*256-2)
-		}
-		s.extraSize = uint16(extraSize)
-		util.Uint16toBytes(header[6:8], s.extraSize)
-
-		header = append(header, extraData...)
-	}
-
-	return header
-}
-
-func (s *SuperBlock) Initialized() bool {
-	return s.ReplicaPlacement != nil && s.Ttl != nil
-}
-
 func (v *Volume) maybeWriteSuperBlock() error {
 
 	datSize, _, e := v.DataBackend.GetStat()
@@ -82,7 +17,7 @@ func (v *Volume) maybeWriteSuperBlock() error {
 		return e
 	}
 	if datSize == 0 {
-		v.SuperBlock.version = needle.CurrentVersion
+		v.SuperBlock.Version = needle.CurrentVersion
 		_, e = v.DataBackend.WriteAt(v.SuperBlock.Bytes(), 0)
 		if e != nil && os.IsPermission(e) {
 			//read-only, but zero length - recreate it!
@@ -100,38 +35,6 @@ func (v *Volume) maybeWriteSuperBlock() error {
 }
 
 func (v *Volume) readSuperBlock() (err error) {
-	v.SuperBlock, err = ReadSuperBlock(v.DataBackend)
+	v.SuperBlock, err = super_block.ReadSuperBlock(v.DataBackend)
 	return err
 }
-
-// ReadSuperBlock reads from data file and load it into volume's super block
-func ReadSuperBlock(datBackend backend.BackendStorageFile) (superBlock SuperBlock, err error) {
-
-	header := make([]byte, _SuperBlockSize)
-	if _, e := datBackend.ReadAt(header, 0); e != nil {
-		err = fmt.Errorf("cannot read volume %s super block: %v", datBackend.Name(), e)
-		return
-	}
-
-	superBlock.version = needle.Version(header[0])
-	if superBlock.ReplicaPlacement, err = NewReplicaPlacementFromByte(header[1]); err != nil {
-		err = fmt.Errorf("cannot read replica type: %s", err.Error())
-		return
-	}
-	superBlock.Ttl = needle.LoadTTLFromBytes(header[2:4])
-	superBlock.CompactionRevision = util.BytesToUint16(header[4:6])
-	superBlock.extraSize = util.BytesToUint16(header[6:8])
-
-	if superBlock.extraSize > 0 {
-		// read more
-		extraData := make([]byte, int(superBlock.extraSize))
-		superBlock.Extra = &master_pb.SuperBlockExtra{}
-		err = proto.Unmarshal(extraData, superBlock.Extra)
-		if err != nil {
-			err = fmt.Errorf("cannot read volume %s super block extra: %v", datBackend.Name(), err)
-			return
-		}
-	}
-
-	return
-}
diff --git a/weed/storage/volume_vacuum.go b/weed/storage/volume_vacuum.go
index caa1777e4..cb51a449c 100644
--- a/weed/storage/volume_vacuum.go
+++ b/weed/storage/volume_vacuum.go
@@ -11,6 +11,7 @@ import (
 	idx2 "github.com/chrislusf/seaweedfs/weed/storage/idx"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
@@ -133,7 +134,7 @@ func (v *Volume) cleanupCompact() error {
 }
 
 func fetchCompactRevisionFromDatFile(datBackend backend.BackendStorageFile) (compactRevision uint16, err error) {
-	superBlock, err := ReadSuperBlock(datBackend)
+	superBlock, err := super_block.ReadSuperBlock(datBackend)
 	if err != nil {
 		return 0, err
 	}
@@ -277,8 +278,8 @@ type VolumeFileScanner4Vacuum struct {
 	writeThrottler *util.WriteThrottler
 }
 
-func (scanner *VolumeFileScanner4Vacuum) VisitSuperBlock(superBlock SuperBlock) error {
-	scanner.version = superBlock.Version()
+func (scanner *VolumeFileScanner4Vacuum) VisitSuperBlock(superBlock super_block.SuperBlock) error {
+	scanner.version = superBlock.Version
 	superBlock.CompactionRevision++
 	_, err := scanner.dstBackend.WriteAt(superBlock.Bytes(), 0)
 	scanner.newOffset = int64(superBlock.BlockSize())
diff --git a/weed/storage/volume_vacuum_test.go b/weed/storage/volume_vacuum_test.go
index ba1e59f2c..07b9f70c1 100644
--- a/weed/storage/volume_vacuum_test.go
+++ b/weed/storage/volume_vacuum_test.go
@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 )
 
@@ -46,7 +47,7 @@ func TestMakeDiff(t *testing.T) {
 	v := new(Volume)
 	//lastCompactIndexOffset value is the index file size before step 4
 	v.lastCompactIndexOffset = 96
-	v.SuperBlock.version = 0x2
+	v.SuperBlock.Version = 0x2
 	/*
 		err := v.makeupDiff(
 			"/yourpath/1.cpd",
@@ -68,7 +69,7 @@ func TestCompaction(t *testing.T) {
 	}
 	defer os.RemoveAll(dir) // clean up
 
-	v, err := NewVolume(dir, "", 1, NeedleMapInMemory, &ReplicaPlacement{}, &needle.TTL{}, 0, 0)
+	v, err := NewVolume(dir, "", 1, NeedleMapInMemory, &super_block.ReplicaPlacement{}, &needle.TTL{}, 0, 0)
 	if err != nil {
 		t.Fatalf("volume creation: %v", err)
 	}
diff --git a/weed/topology/collection.go b/weed/topology/collection.go
index f6b728ec9..7a611d904 100644
--- a/weed/topology/collection.go
+++ b/weed/topology/collection.go
@@ -3,8 +3,8 @@ package topology
 import (
 	"fmt"
 
-	"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/util"
 )
 
@@ -24,7 +24,7 @@ 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 *storage.ReplicaPlacement, ttl *needle.TTL) *VolumeLayout {
+func (c *Collection) GetOrCreateVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL) *VolumeLayout {
 	keyString := rp.String()
 	if ttl != nil {
 		keyString += ttl.String()
diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index b7ebe8af5..e6cb44727 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -7,11 +7,13 @@ import (
 	"sync"
 
 	"github.com/chrislusf/raft"
+
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/sequence"
 	"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/util"
 )
 
@@ -129,7 +131,7 @@ 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 *storage.ReplicaPlacement, ttl *needle.TTL) *VolumeLayout {
+func (t *Topology) GetVolumeLayout(collectionName string, rp *super_block.ReplicaPlacement, ttl *needle.TTL) *VolumeLayout {
 	return t.collectionMap.Get(collectionName, func() interface{} {
 		return NewCollection(collectionName, t.volumeSizeLimit)
 	}).(*Collection).GetOrCreateVolumeLayout(rp, ttl)
diff --git a/weed/topology/topology_test.go b/weed/topology/topology_test.go
index 8f79ad684..e7676ccf7 100644
--- a/weed/topology/topology_test.go
+++ b/weed/topology/topology_test.go
@@ -5,6 +5,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/sequence"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 
 	"testing"
 )
@@ -94,7 +95,7 @@ func TestHandlingVolumeServerHeartbeat(t *testing.T) {
 			[]*master_pb.VolumeShortInformationMessage{newVolumeShortMessage},
 			nil,
 			dn)
-		rp, _ := storage.NewReplicaPlacementFromString("000")
+		rp, _ := super_block.NewReplicaPlacementFromString("000")
 		layout := topo.GetVolumeLayout("", rp, needle.EMPTY_TTL)
 		assert(t, "writables after repeated add", len(layout.writables), volumeCount)
 
@@ -154,7 +155,7 @@ func TestAddRemoveVolume(t *testing.T) {
 		DeletedByteCount: 45,
 		ReadOnly:         false,
 		Version:          needle.CurrentVersion,
-		ReplicaPlacement: &storage.ReplicaPlacement{},
+		ReplicaPlacement: &super_block.ReplicaPlacement{},
 		Ttl:              needle.EMPTY_TTL,
 	}
 
diff --git a/weed/topology/volume_growth.go b/weed/topology/volume_growth.go
index 636eb2260..80fbc86cd 100644
--- a/weed/topology/volume_growth.go
+++ b/weed/topology/volume_growth.go
@@ -6,6 +6,8 @@ import (
 	"sync"
 
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
+
 	"google.golang.org/grpc"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -22,7 +24,7 @@ This package is created to resolve these replica placement issues:
 
 type VolumeGrowOption struct {
 	Collection         string
-	ReplicaPlacement   *storage.ReplicaPlacement
+	ReplicaPlacement   *super_block.ReplicaPlacement
 	Ttl                *needle.TTL
 	Prealloacte        int64
 	DataCenter         string
diff --git a/weed/topology/volume_growth_test.go b/weed/topology/volume_growth_test.go
index 3573365fd..e3c5cc580 100644
--- a/weed/topology/volume_growth_test.go
+++ b/weed/topology/volume_growth_test.go
@@ -8,6 +8,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/sequence"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
 var topologyLayout = `
@@ -113,7 +114,7 @@ func setup(topologyLayout string) *Topology {
 func TestFindEmptySlotsForOneVolume(t *testing.T) {
 	topo := setup(topologyLayout)
 	vg := NewDefaultVolumeGrowth()
-	rp, _ := storage.NewReplicaPlacementFromString("002")
+	rp, _ := super_block.NewReplicaPlacementFromString("002")
 	volumeGrowOption := &VolumeGrowOption{
 		Collection:       "",
 		ReplicaPlacement: rp,
diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index 799cbca62..7633b28be 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -10,11 +10,12 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
 // mapping from volume to its locations, inverted from server to volume
 type VolumeLayout struct {
-	rp               *storage.ReplicaPlacement
+	rp               *super_block.ReplicaPlacement
 	ttl              *needle.TTL
 	vid2location     map[needle.VolumeId]*VolumeLocationList
 	writables        []needle.VolumeId        // transient array of writable volume id
@@ -30,7 +31,7 @@ type VolumeLayoutStats struct {
 	FileCount uint64
 }
 
-func NewVolumeLayout(rp *storage.ReplicaPlacement, ttl *needle.TTL, volumeSizeLimit uint64) *VolumeLayout {
+func NewVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, volumeSizeLimit uint64) *VolumeLayout {
 	return &VolumeLayout{
 		rp:               rp,
 		ttl:              ttl,