diff --git a/weed/command/mount.go b/weed/command/mount.go
index a4ee03ac5..6a7856546 100644
--- a/weed/command/mount.go
+++ b/weed/command/mount.go
@@ -8,6 +8,7 @@ type MountOptions struct {
 	replication      *string
 	ttlSec           *int
 	chunkSizeLimitMB *int
+	dataCenter       *string
 }
 
 var (
@@ -23,6 +24,7 @@ func init() {
 	mountOptions.replication = cmdMount.Flag.String("replication", "000", "replication to create to files")
 	mountOptions.ttlSec = cmdMount.Flag.Int("ttl", 0, "file ttl in seconds")
 	mountOptions.chunkSizeLimitMB = cmdMount.Flag.Int("chunkSizeLimitMB", 16, "local write buffer size, also chunk large files")
+	mountOptions.dataCenter = cmdMount.Flag.String("dataCenter", "", "prefer to write to the data center")
 }
 
 var cmdMount = &Command{
diff --git a/weed/filesys/dirty_page.go b/weed/filesys/dirty_page.go
index 172262c98..6a7b557c2 100644
--- a/weed/filesys/dirty_page.go
+++ b/weed/filesys/dirty_page.go
@@ -122,6 +122,7 @@ func (pages *ContinuousDirtyPages) saveToStorage(ctx context.Context, buf []byte
 			Replication: pages.f.wfs.replication,
 			Collection:  pages.f.wfs.collection,
 			TtlSec:      pages.f.wfs.ttlSec,
+			DataCenter:  pages.f.wfs.dataCenter,
 		}
 
 		resp, err := client.AssignVolume(ctx, request)
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index d7e133483..56b69a8ac 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -18,6 +18,7 @@ type WFS struct {
 	replication               string
 	ttlSec                    int32
 	chunkSizeLimit            int64
+	dataCenter                string
 
 	// contains all open handles
 	handles           []*FileHandle
@@ -25,7 +26,7 @@ type WFS struct {
 	pathToHandleLock  sync.Mutex
 }
 
-func NewSeaweedFileSystem(filerGrpcAddress string, collection string, replication string, ttlSec int32, chunkSizeLimitMB int) *WFS {
+func NewSeaweedFileSystem(filerGrpcAddress string, collection string, replication string, ttlSec int32, chunkSizeLimitMB int, dataCenter string) *WFS {
 	return &WFS{
 		filerGrpcAddress:          filerGrpcAddress,
 		listDirectoryEntriesCache: ccache.New(ccache.Configure().MaxSize(6000).ItemsToPrune(100)),
@@ -33,6 +34,7 @@ func NewSeaweedFileSystem(filerGrpcAddress string, collection string, replicatio
 		replication:               replication,
 		ttlSec:                    ttlSec,
 		chunkSizeLimit:            int64(chunkSizeLimitMB) * 1024 * 1024,
+		dataCenter:                dataCenter,
 		pathToHandleIndex:         make(map[string]int),
 	}
 }
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 684782cfe..fe1fe4d8d 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -127,6 +127,7 @@ message AssignVolumeRequest {
     string collection = 2;
     string replication = 3;
     int32 ttl_sec = 4;
+    string data_center = 5;
 }
 
 message AssignVolumeResponse {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 2675ab6a0..0756c6c7c 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -500,6 +500,7 @@ type AssignVolumeRequest struct {
 	Collection  string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
 	Replication string `protobuf:"bytes,3,opt,name=replication" json:"replication,omitempty"`
 	TtlSec      int32  `protobuf:"varint,4,opt,name=ttl_sec,json=ttlSec" json:"ttl_sec,omitempty"`
+	DataCenter  string `protobuf:"bytes,5,opt,name=data_center,json=dataCenter" json:"data_center,omitempty"`
 }
 
 func (m *AssignVolumeRequest) Reset()                    { *m = AssignVolumeRequest{} }
@@ -535,6 +536,13 @@ func (m *AssignVolumeRequest) GetTtlSec() int32 {
 	return 0
 }
 
+func (m *AssignVolumeRequest) GetDataCenter() string {
+	if m != nil {
+		return m.DataCenter
+	}
+	return ""
+}
+
 type AssignVolumeResponse struct {
 	FileId    string `protobuf:"bytes,1,opt,name=file_id,json=fileId" json:"file_id,omitempty"`
 	Url       string `protobuf:"bytes,2,opt,name=url" json:"url,omitempty"`
@@ -979,66 +987,67 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 971 bytes of a gzipped FileDescriptorProto
+	// 990 bytes of a gzipped FileDescriptorProto
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+	0xae, 0xcf, 0x8d, 0xf3, 0xf6, 0x73, 0x63, 0x8d, 0x67, 0xe7, 0x8d, 0xe3, 0x49, 0x8f, 0xe0, 0xee,
+	0x73, 0x14, 0xca, 0x9e, 0xa5, 0x02, 0x53, 0x51, 0xb6, 0xba, 0x69, 0xe0, 0xe8, 0x31, 0xdc, 0x5b,
+	0xcf, 0x30, 0x94, 0x7d, 0xd8, 0x8e, 0xb4, 0x49, 0xa5, 0x8c, 0x82, 0xf2, 0x4a, 0x7f, 0x06, 0x72,
+	0x92, 0x63, 0x28, 0xf0, 0x1d, 0x74, 0xa7, 0xd2, 0x90, 0xce, 0x6b, 0x35, 0xe4, 0x2e, 0x8c, 0x6b,
+	0xd0, 0x9a, 0x8b, 0xac, 0x78, 0xb1, 0x8c, 0xdf, 0x57, 0xc5, 0x1a, 0xb4, 0xa9, 0xf8, 0x97, 0x03,
+	0xe4, 0x14, 0x13, 0x7c, 0xa7, 0x92, 0x2d, 0xe2, 0xda, 0x50, 0x20, 0xb7, 0xa9, 0x40, 0x0f, 0xe1,
+	0x8e, 0x0c, 0x51, 0xd5, 0x66, 0x71, 0x28, 0x42, 0xb5, 0x5a, 0x83, 0x60, 0xc4, 0xb8, 0xa6, 0x70,
+	0x1a, 0x8a, 0x50, 0x12, 0xad, 0x11, 0x32, 0x44, 0xff, 0x71, 0x60, 0xfc, 0x94, 0x73, 0x36, 0x4f,
+	0x7f, 0xca, 0x92, 0x62, 0x81, 0x25, 0xd3, 0x5d, 0xe8, 0x45, 0x59, 0x61, 0x5e, 0x5e, 0x2f, 0xd0,
+	0x97, 0xb5, 0x45, 0xea, 0x34, 0x16, 0x69, 0x6d, 0x15, 0xdd, 0xe6, 0x2a, 0x5a, 0xab, 0xd6, 0xb5,
+	0x57, 0x8d, 0x7c, 0x0a, 0x43, 0xc9, 0x7d, 0x16, 0x61, 0x2a, 0x30, 0x57, 0x5a, 0xe0, 0x05, 0x20,
+	0x4d, 0x27, 0xca, 0x42, 0x6f, 0x60, 0xb7, 0x4e, 0xd4, 0x0c, 0xda, 0x46, 0x31, 0x94, 0x3a, 0x93,
+	0x27, 0x86, 0xa5, 0x3c, 0xaa, 0xed, 0x2c, 0x2e, 0x13, 0x16, 0xcd, 0xa4, 0xc3, 0x35, 0xdb, 0xa9,
+	0x2c, 0x17, 0x79, 0xb2, 0xea, 0xb9, 0x6b, 0xf5, 0x4c, 0xbf, 0x86, 0xb1, 0xfe, 0xbc, 0xd5, 0x1f,
+	0xd0, 0x3e, 0xc0, 0x8d, 0x32, 0xcc, 0x58, 0xac, 0x3f, 0x33, 0x5e, 0xe0, 0x69, 0xcb, 0x8b, 0x98,
+	0xd3, 0xef, 0xc0, 0x3b, 0xcb, 0x74, 0xcf, 0x9c, 0x1c, 0x81, 0x97, 0x94, 0x17, 0xf3, 0x45, 0x22,
+	0xab, 0x79, 0x2a, 0xe3, 0x82, 0x55, 0x10, 0xfd, 0x16, 0x06, 0xa5, 0xb9, 0xec, 0xc3, 0xd9, 0xd4,
+	0x47, 0x67, 0xad, 0x0f, 0xfa, 0x9f, 0x03, 0xbb, 0x75, 0xca, 0xe6, 0x51, 0x5d, 0xc0, 0x4e, 0x55,
+	0x62, 0xb6, 0x08, 0x97, 0x86, 0xcb, 0x91, 0xcd, 0xa5, 0x99, 0x56, 0x11, 0xe4, 0x2f, 0xc3, 0xa5,
+	0x9e, 0x9e, 0x51, 0x62, 0x99, 0x26, 0x3f, 0xc2, 0x47, 0x8d, 0x10, 0xc9, 0xfa, 0x1a, 0xcb, 0x21,
+	0x97, 0x47, 0xf2, 0x18, 0x7a, 0x37, 0x61, 0x52, 0xa0, 0xd9, 0xa8, 0x71, 0xf3, 0x09, 0xf0, 0x40,
+	0x47, 0x7c, 0xd3, 0x79, 0xe2, 0x1c, 0xff, 0xdb, 0x83, 0xd1, 0x39, 0x86, 0xbf, 0x21, 0xc6, 0x52,
+	0x5f, 0x72, 0x32, 0x2f, 0xbb, 0xaa, 0xff, 0x67, 0x90, 0x47, 0xeb, 0xf4, 0x5b, 0x7f, 0x6c, 0x26,
+	0x5f, 0xbc, 0x29, 0xcc, 0x6c, 0xc4, 0x16, 0x39, 0x83, 0xa1, 0xf5, 0x57, 0x41, 0xf6, 0xac, 0xc4,
+	0xc6, 0x0f, 0xca, 0x64, 0x7f, 0x83, 0xb7, 0x42, 0x0b, 0x81, 0x34, 0x95, 0x9d, 0x7c, 0xbe, 0x4a,
+	0xdb, 0xf8, 0x85, 0x99, 0x3c, 0x7c, 0x7d, 0x90, 0x4d, 0xd8, 0x92, 0x3d, 0x9b, 0x70, 0x53, 0x68,
+	0x6d, 0xc2, 0x6d, 0x5a, 0xa9, 0xd0, 0x2c, 0x49, 0xb3, 0xd1, 0x9a, 0x22, 0x6a, 0xa3, 0xb5, 0xe9,
+	0xa0, 0x42, 0xb3, 0x74, 0xc7, 0x46, 0x6b, 0xea, 0xa3, 0x8d, 0xd6, 0x26, 0x56, 0x5b, 0xe4, 0x15,
+	0x8c, 0x6c, 0x11, 0x20, 0x56, 0x42, 0x8b, 0x8a, 0x4d, 0x1e, 0x6c, 0x72, 0xdb, 0x80, 0xf6, 0xcc,
+	0xdb, 0x80, 0x2d, 0x5b, 0x6f, 0x03, 0xb6, 0xad, 0x0a, 0xdd, 0xba, 0xec, 0xab, 0xff, 0xed, 0xaf,
+	0xfe, 0x0f, 0x00, 0x00, 0xff, 0xff, 0x65, 0x12, 0xc7, 0x9d, 0x7e, 0x0b, 0x00, 0x00,
 }
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 3242057f8..3e15cc546 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -175,14 +175,19 @@ func (fs *FilerServer) AssignVolume(ctx context.Context, req *filer_pb.AssignVol
 
 	var altRequest *operation.VolumeAssignRequest
 
+	dataCenter := req.DataCenter
+	if dataCenter!=""{
+		dataCenter = fs.option.DataCenter
+	}
+
 	assignRequest := &operation.VolumeAssignRequest{
 		Count:       uint64(req.Count),
 		Replication: req.Replication,
 		Collection:  req.Collection,
 		Ttl:         ttlStr,
-		DataCenter:  fs.option.DataCenter,
+		DataCenter:  dataCenter,
 	}
-	if fs.option.DataCenter != "" {
+	if dataCenter != "" {
 		altRequest = &operation.VolumeAssignRequest{
 			Count:       uint64(req.Count),
 			Replication: req.Replication,
diff --git a/weed/server/filer_server_handlers_write.go b/weed/server/filer_server_handlers_write.go
index 83e62a8e7..ba7c17b79 100644
--- a/weed/server/filer_server_handlers_write.go
+++ b/weed/server/filer_server_handlers_write.go
@@ -41,16 +41,16 @@ func (fs *FilerServer) queryFileInfoByPath(w http.ResponseWriter, r *http.Reques
 	return
 }
 
-func (fs *FilerServer) assignNewFileInfo(w http.ResponseWriter, r *http.Request, replication, collection string) (fileId, urlLocation string, err error) {
+func (fs *FilerServer) assignNewFileInfo(w http.ResponseWriter, r *http.Request, replication, collection string, dataCenter string) (fileId, urlLocation string, err error) {
 	ar := &operation.VolumeAssignRequest{
 		Count:       1,
 		Replication: replication,
 		Collection:  collection,
 		Ttl:         r.URL.Query().Get("ttl"),
-		DataCenter:  fs.option.DataCenter,
+		DataCenter:  dataCenter,
 	}
 	var altRequest *operation.VolumeAssignRequest
-	if fs.option.DataCenter != "" {
+	if dataCenter != "" {
 		altRequest = &operation.VolumeAssignRequest{
 			Count:       1,
 			Replication: replication,
@@ -82,8 +82,12 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 	if collection == "" {
 		collection = fs.option.Collection
 	}
+	dataCenter := query.Get("dataCenter")
+	if dataCenter == "" {
+		dataCenter = fs.option.DataCenter
+	}
 
-	if autoChunked := fs.autoChunk(w, r, replication, collection); autoChunked {
+	if autoChunked := fs.autoChunk(w, r, replication, collection, dataCenter); autoChunked {
 		return
 	}
 
@@ -91,12 +95,12 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 	var err error
 
 	if strings.HasPrefix(r.Header.Get("Content-Type"), "multipart/form-data; boundary=") {
-		fileId, urlLocation, err = fs.multipartUploadAnalyzer(w, r, replication, collection)
+		fileId, urlLocation, err = fs.multipartUploadAnalyzer(w, r, replication, collection, dataCenter)
 		if err != nil {
 			return
 		}
 	} else {
-		fileId, urlLocation, err = fs.monolithicUploadAnalyzer(w, r, replication, collection)
+		fileId, urlLocation, err = fs.monolithicUploadAnalyzer(w, r, replication, collection, dataCenter)
 		if err != nil {
 			return
 		}
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index e41e01146..f87e7d65a 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -16,7 +16,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
-func (fs *FilerServer) autoChunk(w http.ResponseWriter, r *http.Request, replication string, collection string) bool {
+func (fs *FilerServer) autoChunk(w http.ResponseWriter, r *http.Request, replication string, collection string, dataCenter string) bool {
 	if r.Method != "POST" {
 		glog.V(4).Infoln("AutoChunking not supported for method", r.Method)
 		return false
@@ -52,7 +52,7 @@ func (fs *FilerServer) autoChunk(w http.ResponseWriter, r *http.Request, replica
 		return false
 	}
 
-	reply, err := fs.doAutoChunk(w, r, contentLength, chunkSize, replication, collection)
+	reply, err := fs.doAutoChunk(w, r, contentLength, chunkSize, replication, collection, dataCenter)
 	if err != nil {
 		writeJsonError(w, r, http.StatusInternalServerError, err)
 	} else if reply != nil {
@@ -61,7 +61,7 @@ func (fs *FilerServer) autoChunk(w http.ResponseWriter, r *http.Request, replica
 	return true
 }
 
-func (fs *FilerServer) doAutoChunk(w http.ResponseWriter, r *http.Request, contentLength int64, chunkSize int32, replication string, collection string) (filerResult *FilerPostResult, replyerr error) {
+func (fs *FilerServer) doAutoChunk(w http.ResponseWriter, r *http.Request, contentLength int64, chunkSize int32, replication string, collection string, dataCenter string) (filerResult *FilerPostResult, replyerr error) {
 
 	multipartReader, multipartReaderErr := r.MultipartReader()
 	if multipartReaderErr != nil {
@@ -104,7 +104,7 @@ func (fs *FilerServer) doAutoChunk(w http.ResponseWriter, r *http.Request, conte
 
 		if chunkBufOffset >= chunkSize || readFully || (chunkBufOffset > 0 && bytesRead == 0) {
 			writtenChunks = writtenChunks + 1
-			fileId, urlLocation, assignErr := fs.assignNewFileInfo(w, r, replication, collection)
+			fileId, urlLocation, assignErr := fs.assignNewFileInfo(w, r, replication, collection, dataCenter)
 			if assignErr != nil {
 				return nil, assignErr
 			}
diff --git a/weed/server/filer_server_handlers_write_monopart.go b/weed/server/filer_server_handlers_write_monopart.go
index db8869d67..777d5bc43 100644
--- a/weed/server/filer_server_handlers_write_monopart.go
+++ b/weed/server/filer_server_handlers_write_monopart.go
@@ -73,7 +73,7 @@ func checkContentMD5(w http.ResponseWriter, r *http.Request) (err error) {
 	return
 }
 
-func (fs *FilerServer) monolithicUploadAnalyzer(w http.ResponseWriter, r *http.Request, replication, collection string) (fileId, urlLocation string, err error) {
+func (fs *FilerServer) monolithicUploadAnalyzer(w http.ResponseWriter, r *http.Request, replication, collection string, dataCenter string) (fileId, urlLocation string, err error) {
 	/*
 		Amazon S3 ref link:[http://docs.aws.amazon.com/AmazonS3/latest/API/Welcome.html]
 		There is a long way to provide a completely compatibility against all Amazon S3 API, I just made
@@ -104,7 +104,7 @@ func (fs *FilerServer) monolithicUploadAnalyzer(w http.ResponseWriter, r *http.R
 	path := r.URL.Path
 
 	if fileId, urlLocation, err = fs.queryFileInfoByPath(w, r, path); err == nil && fileId == "" {
-		fileId, urlLocation, err = fs.assignNewFileInfo(w, r, replication, collection)
+		fileId, urlLocation, err = fs.assignNewFileInfo(w, r, replication, collection, dataCenter)
 	}
 	return
 }
diff --git a/weed/server/filer_server_handlers_write_multipart.go b/weed/server/filer_server_handlers_write_multipart.go
index 91f892b52..056317750 100644
--- a/weed/server/filer_server_handlers_write_multipart.go
+++ b/weed/server/filer_server_handlers_write_multipart.go
@@ -10,7 +10,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage"
 )
 
-func (fs *FilerServer) multipartUploadAnalyzer(w http.ResponseWriter, r *http.Request, replication, collection string) (fileId, urlLocation string, err error) {
+func (fs *FilerServer) multipartUploadAnalyzer(w http.ResponseWriter, r *http.Request, replication, collection string, dataCenter string) (fileId, urlLocation string, err error) {
 	//Default handle way for http multipart
 	if r.Method == "PUT" {
 		buf, _ := ioutil.ReadAll(r.Body)
@@ -33,7 +33,7 @@ func (fs *FilerServer) multipartUploadAnalyzer(w http.ResponseWriter, r *http.Re
 		}
 		fileId, urlLocation, err = fs.queryFileInfoByPath(w, r, path)
 	} else {
-		fileId, urlLocation, err = fs.assignNewFileInfo(w, r, replication, collection)
+		fileId, urlLocation, err = fs.assignNewFileInfo(w, r, replication, collection, dataCenter)
 	}
 	return
 }