diff --git a/weed/command/benchmark.go b/weed/command/benchmark.go
index e241a904e..080312aa8 100644
--- a/weed/command/benchmark.go
+++ b/weed/command/benchmark.go
@@ -125,7 +125,7 @@ func runBenchmark(cmd *Command, args []string) bool {
 		defer pprof.StopCPUProfile()
 	}
 
-	b.masterClient = wdclient.NewMasterClient(b.grpcDialOption, "client", "", 0, strings.Split(*b.masters, ","))
+	b.masterClient = wdclient.NewMasterClient(b.grpcDialOption, "client", "", 0, "", strings.Split(*b.masters, ","))
 	go b.masterClient.KeepConnectedToMaster()
 	b.masterClient.WaitUntilConnected()
 
diff --git a/weed/command/filer.go b/weed/command/filer.go
index 1ea334e61..017427335 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -59,7 +59,7 @@ func init() {
 	f.disableDirListing = cmdFiler.Flag.Bool("disableDirListing", false, "turn off directory listing")
 	f.maxMB = cmdFiler.Flag.Int("maxMB", 32, "split files larger than the limit")
 	f.dirListingLimit = cmdFiler.Flag.Int("dirListLimit", 100000, "limit sub dir listing size")
-	f.dataCenter = cmdFiler.Flag.String("dataCenter", "", "prefer to write to volumes in this data center")
+	f.dataCenter = cmdFiler.Flag.String("dataCenter", "", "prefer to read and write to volumes in this data center")
 	f.rack = cmdFiler.Flag.String("rack", "", "prefer to write to volumes in this rack")
 	f.disableHttp = cmdFiler.Flag.Bool("disableHttp", false, "disable http request, only gRpc operations are allowed")
 	f.cipher = cmdFiler.Flag.Bool("encryptVolumeData", false, "encrypt data on volume servers")
diff --git a/weed/filer/filer.go b/weed/filer/filer.go
index 35f4cdc6a..0c4d610c5 100644
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -44,9 +44,9 @@ type Filer struct {
 }
 
 func NewFiler(masters []string, grpcDialOption grpc.DialOption,
-	filerHost string, filerGrpcPort uint32, collection string, replication string, notifyFn func()) *Filer {
+	filerHost string, filerGrpcPort uint32, collection string, replication string, dataCenter string, notifyFn func()) *Filer {
 	f := &Filer{
-		MasterClient:        wdclient.NewMasterClient(grpcDialOption, "filer", filerHost, filerGrpcPort, masters),
+		MasterClient:        wdclient.NewMasterClient(grpcDialOption, "filer", filerHost, filerGrpcPort, dataCenter, masters),
 		fileIdDeletionQueue: util.NewUnboundedQueue(),
 		GrpcDialOption:      grpcDialOption,
 	}
diff --git a/weed/filer/leveldb/leveldb_store_test.go b/weed/filer/leveldb/leveldb_store_test.go
index b07f81129..c5bfb8474 100644
--- a/weed/filer/leveldb/leveldb_store_test.go
+++ b/weed/filer/leveldb/leveldb_store_test.go
@@ -11,7 +11,7 @@ import (
 )
 
 func TestCreateAndFind(t *testing.T) {
-	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", nil)
+	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", "", nil)
 	dir, _ := ioutil.TempDir("", "seaweedfs_filer_test")
 	defer os.RemoveAll(dir)
 	store := &LevelDBStore{}
@@ -65,7 +65,7 @@ func TestCreateAndFind(t *testing.T) {
 }
 
 func TestEmptyRoot(t *testing.T) {
-	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", nil)
+	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", "", nil)
 	dir, _ := ioutil.TempDir("", "seaweedfs_filer_test2")
 	defer os.RemoveAll(dir)
 	store := &LevelDBStore{}
diff --git a/weed/filer/leveldb2/leveldb2_store_test.go b/weed/filer/leveldb2/leveldb2_store_test.go
index c9b140951..22c0d6052 100644
--- a/weed/filer/leveldb2/leveldb2_store_test.go
+++ b/weed/filer/leveldb2/leveldb2_store_test.go
@@ -11,7 +11,7 @@ import (
 )
 
 func TestCreateAndFind(t *testing.T) {
-	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", nil)
+	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", "", nil)
 	dir, _ := ioutil.TempDir("", "seaweedfs_filer_test")
 	defer os.RemoveAll(dir)
 	store := &LevelDB2Store{}
@@ -65,7 +65,7 @@ func TestCreateAndFind(t *testing.T) {
 }
 
 func TestEmptyRoot(t *testing.T) {
-	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", nil)
+	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", "", nil)
 	dir, _ := ioutil.TempDir("", "seaweedfs_filer_test2")
 	defer os.RemoveAll(dir)
 	store := &LevelDB2Store{}
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 3d54ea2c9..5133c1fea 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: filer.proto
 
 package filer_pb
diff --git a/weed/pb/iam_pb/iam.pb.go b/weed/pb/iam_pb/iam.pb.go
index 93bc854cc..6c1cc0e45 100644
--- a/weed/pb/iam_pb/iam.pb.go
+++ b/weed/pb/iam_pb/iam.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: iam.proto
 
 package iam_pb
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 96c3c75cc..6803a30cf 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -130,6 +130,7 @@ message VolumeLocation {
     repeated uint32 new_vids = 3;
     repeated uint32 deleted_vids = 4;
     string leader = 5; // optional when leader is not itself
+    string data_center = 6; // optional when DataCenter is in use
 }
 
 message LookupVolumeRequest {
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index d23366ade..8d4d4d4e7 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: master.proto
 
 package master_pb
@@ -783,7 +783,8 @@ type VolumeLocation struct {
 	PublicUrl   string   `protobuf:"bytes,2,opt,name=public_url,json=publicUrl,proto3" json:"public_url,omitempty"`
 	NewVids     []uint32 `protobuf:"varint,3,rep,packed,name=new_vids,json=newVids,proto3" json:"new_vids,omitempty"`
 	DeletedVids []uint32 `protobuf:"varint,4,rep,packed,name=deleted_vids,json=deletedVids,proto3" json:"deleted_vids,omitempty"`
-	Leader      string   `protobuf:"bytes,5,opt,name=leader,proto3" json:"leader,omitempty"` // optional when leader is not itself
+	Leader      string   `protobuf:"bytes,5,opt,name=leader,proto3" json:"leader,omitempty"`                           // optional when leader is not itself
+	DataCenter  string   `protobuf:"bytes,6,opt,name=data_center,json=dataCenter,proto3" json:"data_center,omitempty"` // optional when DataCenter is in use
 }
 
 func (x *VolumeLocation) Reset() {
@@ -853,6 +854,13 @@ func (x *VolumeLocation) GetLeader() string {
 	return ""
 }
 
+func (x *VolumeLocation) GetDataCenter() string {
+	if x != nil {
+		return x.DataCenter
+	}
+	return ""
+}
+
 type LookupVolumeRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2992,7 +3000,7 @@ var file_master_proto_rawDesc = []byte{
 	0x6e, 0x65, 0x63, 0x74, 0x65, 0x64, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x12, 0x0a,
 	0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d,
 	0x65, 0x12, 0x1b, 0x0a, 0x09, 0x67, 0x72, 0x70, 0x63, 0x5f, 0x70, 0x6f, 0x72, 0x74, 0x18, 0x02,
-	0x20, 0x01, 0x28, 0x0d, 0x52, 0x08, 0x67, 0x72, 0x70, 0x63, 0x50, 0x6f, 0x72, 0x74, 0x22, 0x97,
+	0x20, 0x01, 0x28, 0x0d, 0x52, 0x08, 0x67, 0x72, 0x70, 0x63, 0x50, 0x6f, 0x72, 0x74, 0x22, 0xb8,
 	0x01, 0x0a, 0x0e, 0x56, 0x6f, 0x6c, 0x75, 0x6d, 0x65, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f,
 	0x6e, 0x12, 0x10, 0x0a, 0x03, 0x75, 0x72, 0x6c, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03,
 	0x75, 0x72, 0x6c, 0x12, 0x1d, 0x0a, 0x0a, 0x70, 0x75, 0x62, 0x6c, 0x69, 0x63, 0x5f, 0x75, 0x72,
@@ -3002,343 +3010,345 @@ var file_master_proto_rawDesc = []byte{
 	0x0c, 0x64, 0x65, 0x6c, 0x65, 0x74, 0x65, 0x64, 0x5f, 0x76, 0x69, 0x64, 0x73, 0x18, 0x04, 0x20,
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 }
 
 var (
diff --git a/weed/pb/messaging_pb/messaging.pb.go b/weed/pb/messaging_pb/messaging.pb.go
index 90b4b724a..bd87a4780 100644
--- a/weed/pb/messaging_pb/messaging.pb.go
+++ b/weed/pb/messaging_pb/messaging.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: messaging.proto
 
 package messaging_pb
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index ee33b8263..6ffbf3d29 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: volume_server.proto
 
 package volume_server_pb
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 065bb3251..dc93ae062 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -89,7 +89,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 		glog.Fatal("master list is required!")
 	}
 
-	fs.filer = filer.NewFiler(option.Masters, fs.grpcDialOption, option.Host, option.Port, option.Collection, option.DefaultReplication, func() {
+	fs.filer = filer.NewFiler(option.Masters, fs.grpcDialOption, option.Host, option.Port, option.Collection, option.DefaultReplication, option.DataCenter, func() {
 		fs.listenersCond.Broadcast()
 	})
 	fs.filer.Cipher = option.Cipher
diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index e8fa3995d..9df88e956 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -86,8 +86,9 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 
 		glog.V(4).Infof("master received heartbeat %s", heartbeat.String())
 		message := &master_pb.VolumeLocation{
-			Url:       dn.Url(),
-			PublicUrl: dn.PublicUrl,
+			Url:        dn.Url(),
+			PublicUrl:  dn.PublicUrl,
+			DataCenter: string(dn.GetDataCenter().Id()),
 		}
 		if len(heartbeat.NewVolumes) > 0 || len(heartbeat.DeletedVolumes) > 0 {
 			// process delta volume ids if exists for fast volume id updates
@@ -148,7 +149,6 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			}
 
 		}
-
 		if len(message.NewVids) > 0 || len(message.DeletedVids) > 0 {
 			ms.clientChansLock.RLock()
 			for host, ch := range ms.clientChans {
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index cc1c4b2ad..ccc94ebac 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -93,7 +93,7 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *Maste
 		preallocateSize: preallocateSize,
 		clientChans:     make(map[string]chan *master_pb.VolumeLocation),
 		grpcDialOption:  grpcDialOption,
-		MasterClient:    wdclient.NewMasterClient(grpcDialOption, "master", option.Host, 0, peers),
+		MasterClient:    wdclient.NewMasterClient(grpcDialOption, "master", option.Host, 0, "", peers),
 		adminLocks:      NewAdminLocks(),
 	}
 	ms.bounedLeaderChan = make(chan int, 16)
diff --git a/weed/shell/commands.go b/weed/shell/commands.go
index 1a937ad53..0e285214b 100644
--- a/weed/shell/commands.go
+++ b/weed/shell/commands.go
@@ -45,7 +45,7 @@ var (
 func NewCommandEnv(options ShellOptions) *CommandEnv {
 	ce := &CommandEnv{
 		env:          make(map[string]string),
-		MasterClient: wdclient.NewMasterClient(options.GrpcDialOption, pb.AdminShellClient, "", 0, strings.Split(*options.Masters, ",")),
+		MasterClient: wdclient.NewMasterClient(options.GrpcDialOption, pb.AdminShellClient, "", 0, "", strings.Split(*options.Masters, ",")),
 		option:       options,
 	}
 	ce.locker = exclusive_locks.NewExclusiveLocker(ce.MasterClient)
diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index df8c186f2..e39b9dfdf 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -24,14 +24,14 @@ type MasterClient struct {
 	vidMap
 }
 
-func NewMasterClient(grpcDialOption grpc.DialOption, clientType string, clientHost string, clientGrpcPort uint32, masters []string) *MasterClient {
+func NewMasterClient(grpcDialOption grpc.DialOption, clientType string, clientHost string, clientGrpcPort uint32, clientDataCenter string, masters []string) *MasterClient {
 	return &MasterClient{
 		clientType:     clientType,
 		clientHost:     clientHost,
 		grpcPort:       clientGrpcPort,
 		masters:        masters,
 		grpcDialOption: grpcDialOption,
-		vidMap:         newVidMap(),
+		vidMap:         newVidMap(clientDataCenter),
 	}
 }
 
@@ -89,7 +89,7 @@ func (mc *MasterClient) tryAllMasters() {
 		}
 
 		mc.currentMaster = ""
-		mc.vidMap = newVidMap()
+		mc.vidMap = newVidMap("")
 	}
 }
 
@@ -130,8 +130,9 @@ func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader stri
 
 			// process new volume location
 			loc := Location{
-				Url:       volumeLocation.Url,
-				PublicUrl: volumeLocation.PublicUrl,
+				Url:        volumeLocation.Url,
+				PublicUrl:  volumeLocation.PublicUrl,
+				DataCenter: volumeLocation.DataCenter,
 			}
 			for _, newVid := range volumeLocation.NewVids {
 				glog.V(1).Infof("%s: %s masterClient adds volume %d", mc.clientType, loc.Url, newVid)
diff --git a/weed/wdclient/vid_map.go b/weed/wdclient/vid_map.go
index cee2da6e1..773da0191 100644
--- a/weed/wdclient/vid_map.go
+++ b/weed/wdclient/vid_map.go
@@ -16,20 +16,22 @@ const (
 )
 
 type Location struct {
-	Url       string `json:"url,omitempty"`
-	PublicUrl string `json:"publicUrl,omitempty"`
+	Url        string `json:"url,omitempty"`
+	PublicUrl  string `json:"publicUrl,omitempty"`
+	DataCenter string `json:"dataCenter,omitempty"`
 }
 
 type vidMap struct {
 	sync.RWMutex
 	vid2Locations map[uint32][]Location
-
-	cursor int32
+	DataCenter    string
+	cursor        int32
 }
 
-func newVidMap() vidMap {
+func newVidMap(dataCenter string) vidMap {
 	return vidMap{
 		vid2Locations: make(map[uint32][]Location),
+		DataCenter:    dataCenter,
 		cursor:        -1,
 	}
 }
@@ -56,7 +58,11 @@ func (vc *vidMap) LookupVolumeServerUrl(vid string) (serverUrls []string, err er
 		return nil, fmt.Errorf("volume %d not found", id)
 	}
 	for _, loc := range locations {
-		serverUrls = append(serverUrls, loc.Url)
+		if vc.DataCenter == "" || loc.DataCenter == "" || vc.DataCenter != loc.DataCenter {
+			serverUrls = append(serverUrls, loc.Url)
+		} else {
+			serverUrls = append([]string{loc.Url}, serverUrls...)
+		}
 	}
 	return
 }
diff --git a/weed/wdclient/vid_map_test.go b/weed/wdclient/vid_map_test.go
index 87be2fc25..0cea698ac 100644
--- a/weed/wdclient/vid_map_test.go
+++ b/weed/wdclient/vid_map_test.go
@@ -45,7 +45,7 @@ func TestLocationIndex(t *testing.T) {
 	mustOk(7, maxCursorIndex, 0)
 
 	// test with constructor
-	vm = newVidMap()
+	vm = newVidMap("")
 	length := 7
 	for i := 0; i < 100; i++ {
 		got, err := vm.getLocationIndex(length)