diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index 9a72bc976..daa20c378 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -95,6 +95,8 @@ message Entry {
     repeated FileChunk chunks = 3;
     FuseAttributes attributes = 4;
     map<string, bytes> extended = 5;
+    bytes hard_link_id = 7;
+    int32 hard_link_counter = 8; // only exists in hard link meta data
 }
 
 message FullEntry {
diff --git a/weed/command/filer.go b/weed/command/filer.go
index a6670b063..7ff9fcd9a 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -13,6 +13,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/server"
+	stats_collect "github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
@@ -36,6 +37,7 @@ type FilerOptions struct {
 	disableHttp             *bool
 	cipher                  *bool
 	peers                   *string
+	metricsHttpPort         *int
 
 	// default leveldb directory, used in "weed server" mode
 	defaultLevelDbDirectory *string
@@ -57,6 +59,7 @@ func init() {
 	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")
 	f.peers = cmdFiler.Flag.String("peers", "", "all filers sharing the same filer store in comma separated ip:port list")
+	f.metricsHttpPort = cmdFiler.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
 }
 
 var cmdFiler = &Command{
@@ -84,6 +87,8 @@ func runFiler(cmd *Command, args []string) bool {
 
 	util.LoadConfiguration("security", false)
 
+	go stats_collect.StartMetricsServer(*f.metricsHttpPort)
+
 	f.startFiler()
 
 	return true
diff --git a/weed/command/s3.go b/weed/command/s3.go
index a9b317138..e94decaf3 100644
--- a/weed/command/s3.go
+++ b/weed/command/s3.go
@@ -23,12 +23,13 @@ var (
 )
 
 type S3Options struct {
-	filer          *string
-	port           *int
-	config         *string
-	domainName     *string
-	tlsPrivateKey  *string
-	tlsCertificate *string
+	filer           *string
+	port            *int
+	config          *string
+	domainName      *string
+	tlsPrivateKey   *string
+	tlsCertificate  *string
+	metricsHttpPort *int
 }
 
 func init() {
@@ -39,6 +40,7 @@ func init() {
 	s3StandaloneOptions.config = cmdS3.Flag.String("config", "", "path to the config file")
 	s3StandaloneOptions.tlsPrivateKey = cmdS3.Flag.String("key.file", "", "path to the TLS private key file")
 	s3StandaloneOptions.tlsCertificate = cmdS3.Flag.String("cert.file", "", "path to the TLS certificate file")
+	s3StandaloneOptions.metricsHttpPort = cmdS3.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
 }
 
 var cmdS3 = &Command{
@@ -113,6 +115,8 @@ func runS3(cmd *Command, args []string) bool {
 
 	util.LoadConfiguration("security", false)
 
+	go stats_collect.StartMetricsServer(*s3StandaloneOptions.metricsHttpPort)
+
 	return s3StandaloneOptions.startS3Server()
 
 }
@@ -153,7 +157,7 @@ func (s3opt *S3Options) startS3Server() bool {
 		}
 	}
 
-	go stats_collect.LoopPushingMetric("s3", stats_collect.SourceName(uint32(*s3opt.port)), stats_collect.S3Gather, metricsAddress, metricsIntervalSec)
+	go stats_collect.LoopPushingMetric("s3", stats_collect.SourceName(uint32(*s3opt.port)), metricsAddress, metricsIntervalSec)
 
 	router := mux.NewRouter().SkipClean(true)
 
diff --git a/weed/command/server.go b/weed/command/server.go
index aee62290a..91d8d22c6 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -2,6 +2,7 @@ package command
 
 import (
 	"fmt"
+	stats_collect "github.com/chrislusf/seaweedfs/weed/stats"
 	"os"
 	"runtime"
 	"runtime/pprof"
@@ -56,6 +57,7 @@ var (
 	volumeDataFolders         = cmdServer.Flag.String("dir", os.TempDir(), "directories to store data files. dir[,dir]...")
 	volumeMaxDataVolumeCounts = cmdServer.Flag.String("volume.max", "8", "maximum numbers of volumes, count[,count]... If set to zero, the limit will be auto configured.")
 	volumeMinFreeSpacePercent = cmdServer.Flag.String("volume.minFreeSpacePercent", "1", "minimum free disk space (default to 1%). Low disk space will mark all volumes as ReadOnly.")
+	serverMetricsHttpPort     = cmdServer.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
 
 	// pulseSeconds              = cmdServer.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
 	isStartingFiler     = cmdServer.Flag.Bool("filer", false, "whether to start filer")
@@ -136,6 +138,7 @@ func runServer(cmd *Command, args []string) bool {
 	peers := strings.Join(peerList, ",")
 	masterOptions.peers = &peers
 
+	// ip address
 	masterOptions.ip = serverIp
 	masterOptions.ipBind = serverBindIp
 	filerOptions.masters = &peers
@@ -167,6 +170,7 @@ func runServer(cmd *Command, args []string) bool {
 	}
 
 	runtime.GOMAXPROCS(runtime.NumCPU())
+	go stats_collect.StartMetricsServer(*serverMetricsHttpPort)
 
 	folders := strings.Split(*volumeDataFolders, ",")
 
diff --git a/weed/command/volume.go b/weed/command/volume.go
index 92f83f945..dfc649ba5 100644
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@@ -25,6 +25,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/server"
+	stats_collect "github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
@@ -56,6 +57,7 @@ type VolumeServerOptions struct {
 	minFreeSpacePercents  []float32
 	pprof                 *bool
 	preStopSeconds        *int
+	metricsHttpPort       *int
 	// pulseSeconds          *int
 }
 
@@ -80,6 +82,7 @@ func init() {
 	v.compactionMBPerSecond = cmdVolume.Flag.Int("compactionMBps", 0, "limit background compaction or copying speed in mega bytes per second")
 	v.fileSizeLimitMB = cmdVolume.Flag.Int("fileSizeLimitMB", 1024, "limit file size to avoid out of memory")
 	v.pprof = cmdVolume.Flag.Bool("pprof", false, "enable pprof http handlers. precludes --memprofile and --cpuprofile")
+	v.metricsHttpPort = cmdVolume.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
 }
 
 var cmdVolume = &Command{
@@ -109,6 +112,8 @@ func runVolume(cmd *Command, args []string) bool {
 		grace.SetupProfiling(*v.cpuProfile, *v.memProfile)
 	}
 
+	go stats_collect.StartMetricsServer(*v.metricsHttpPort)
+
 	v.startVolumeServer(*volumeFolders, *maxVolumeCounts, *volumeWhiteListOption, *minFreeSpacePercent)
 
 	return true
diff --git a/weed/filer/entry.go b/weed/filer/entry.go
index 4a73de19a..421e51432 100644
--- a/weed/filer/entry.go
+++ b/weed/filer/entry.go
@@ -37,6 +37,9 @@ type Entry struct {
 
 	// the following is for files
 	Chunks []*filer_pb.FileChunk `json:"chunks,omitempty"`
+
+	HardLinkId      HardLinkId
+	HardLinkCounter int32
 }
 
 func (entry *Entry) Size() uint64 {
@@ -56,11 +59,13 @@ func (entry *Entry) ToProtoEntry() *filer_pb.Entry {
 		return nil
 	}
 	return &filer_pb.Entry{
-		Name:        entry.FullPath.Name(),
-		IsDirectory: entry.IsDirectory(),
-		Attributes:  EntryAttributeToPb(entry),
-		Chunks:      entry.Chunks,
-		Extended:    entry.Extended,
+		Name:            entry.FullPath.Name(),
+		IsDirectory:     entry.IsDirectory(),
+		Attributes:      EntryAttributeToPb(entry),
+		Chunks:          entry.Chunks,
+		Extended:        entry.Extended,
+		HardLinkId:      entry.HardLinkId,
+		HardLinkCounter: entry.HardLinkCounter,
 	}
 }
 
@@ -75,11 +80,24 @@ func (entry *Entry) ToProtoFullEntry() *filer_pb.FullEntry {
 	}
 }
 
+func (entry *Entry) Clone() *Entry {
+	return &Entry{
+		FullPath:        entry.FullPath,
+		Attr:            entry.Attr,
+		Chunks:          entry.Chunks,
+		Extended:        entry.Extended,
+		HardLinkId:      entry.HardLinkId,
+		HardLinkCounter: entry.HardLinkCounter,
+	}
+}
+
 func FromPbEntry(dir string, entry *filer_pb.Entry) *Entry {
 	return &Entry{
-		FullPath: util.NewFullPath(dir, entry.Name),
-		Attr:     PbToEntryAttribute(entry.Attributes),
-		Chunks:   entry.Chunks,
+		FullPath:        util.NewFullPath(dir, entry.Name),
+		Attr:            PbToEntryAttribute(entry.Attributes),
+		Chunks:          entry.Chunks,
+		HardLinkId:      HardLinkId(entry.HardLinkId),
+		HardLinkCounter: entry.HardLinkCounter,
 	}
 }
 
diff --git a/weed/filer/entry_codec.go b/weed/filer/entry_codec.go
index fb6448b30..884fb2670 100644
--- a/weed/filer/entry_codec.go
+++ b/weed/filer/entry_codec.go
@@ -13,9 +13,11 @@ import (
 
 func (entry *Entry) EncodeAttributesAndChunks() ([]byte, error) {
 	message := &filer_pb.Entry{
-		Attributes: EntryAttributeToPb(entry),
-		Chunks:     entry.Chunks,
-		Extended:   entry.Extended,
+		Attributes:      EntryAttributeToPb(entry),
+		Chunks:          entry.Chunks,
+		Extended:        entry.Extended,
+		HardLinkId:      entry.HardLinkId,
+		HardLinkCounter: entry.HardLinkCounter,
 	}
 	return proto.Marshal(message)
 }
@@ -34,6 +36,9 @@ func (entry *Entry) DecodeAttributesAndChunks(blob []byte) error {
 
 	entry.Chunks = message.Chunks
 
+	entry.HardLinkId = message.HardLinkId
+	entry.HardLinkCounter = message.HardLinkCounter
+
 	return nil
 }
 
@@ -61,6 +66,10 @@ func PbToEntryAttribute(attr *filer_pb.FuseAttributes) Attr {
 
 	t := Attr{}
 
+	if attr == nil {
+		return t
+	}
+
 	t.Crtime = time.Unix(attr.Crtime, 0)
 	t.Mtime = time.Unix(attr.Mtime, 0)
 	t.Mode = os.FileMode(attr.FileMode)
@@ -106,6 +115,13 @@ func EqualEntry(a, b *Entry) bool {
 			return false
 		}
 	}
+
+	if !bytes.Equal(a.HardLinkId, b.HardLinkId) {
+		return false
+	}
+	if a.HardLinkCounter != b.HardLinkCounter {
+		return false
+	}
 	return true
 }
 
diff --git a/weed/filer/filechunk_manifest.go b/weed/filer/filechunk_manifest.go
index e84cf21e5..37b172357 100644
--- a/weed/filer/filechunk_manifest.go
+++ b/weed/filer/filechunk_manifest.go
@@ -90,7 +90,7 @@ func fetchChunk(lookupFileIdFn LookupFileIdFunctionType, fileId string, cipherKe
 		return nil, err
 	}
 	var buffer bytes.Buffer
-	err = util.ReadUrlAsStream(urlString+"?readDeleted=true", cipherKey, isGzipped, true, 0, 0, func(data []byte) {
+	err = util.ReadUrlAsStream(urlString, cipherKey, isGzipped, true, 0, 0, func(data []byte) {
 		buffer.Write(data)
 	})
 	if err != nil {
diff --git a/weed/filer/filer.go b/weed/filer/filer.go
index acbe63486..5b0698211 100644
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -28,7 +28,7 @@ var (
 )
 
 type Filer struct {
-	Store               *FilerStoreWrapper
+	Store               VirtualFilerStore
 	MasterClient        *wdclient.MasterClient
 	fileIdDeletionQueue *util.UnboundedQueue
 	GrpcDialOption      grpc.DialOption
@@ -314,3 +314,11 @@ func (f *Filer) Shutdown() {
 	f.LocalMetaLogBuffer.Shutdown()
 	f.Store.Shutdown()
 }
+
+func (f *Filer) maybeDeleteHardLinks(hardLinkIds []HardLinkId) {
+	for _, hardLinkId := range hardLinkIds {
+		if err := f.Store.DeleteHardLink(context.Background(), hardLinkId); err != nil {
+			glog.Errorf("delete hard link id %d : %v", hardLinkId, err)
+		}
+	}
+}
diff --git a/weed/filer/filer_delete_entry.go b/weed/filer/filer_delete_entry.go
index 379156321..6c9ff56d3 100644
--- a/weed/filer/filer_delete_entry.go
+++ b/weed/filer/filer_delete_entry.go
@@ -10,6 +10,8 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
+type HardLinkId []byte
+
 func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32) (err error) {
 	if p == "/" {
 		return nil
@@ -23,16 +25,19 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	isCollection := f.isBucket(entry)
 
 	var chunks []*filer_pb.FileChunk
+	var hardLinkIds []HardLinkId
 	chunks = append(chunks, entry.Chunks...)
 	if entry.IsDirectory() {
 		// delete the folder children, not including the folder itself
 		var dirChunks []*filer_pb.FileChunk
-		dirChunks, err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isCollection, isFromOtherCluster, signatures)
+		var dirHardLinkIds []HardLinkId
+		dirChunks, dirHardLinkIds, err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isCollection, isFromOtherCluster, signatures)
 		if err != nil {
 			glog.V(0).Infof("delete directory %s: %v", p, err)
 			return fmt.Errorf("delete directory %s: %v", p, err)
 		}
 		chunks = append(chunks, dirChunks...)
+		hardLinkIds = append(hardLinkIds, dirHardLinkIds...)
 	}
 
 	// delete the file or folder
@@ -44,6 +49,12 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	if shouldDeleteChunks && !isCollection {
 		go f.DeleteChunks(chunks)
 	}
+	// A case not handled:
+	// what if the chunk is in a different collection?
+	if shouldDeleteChunks {
+		f.maybeDeleteHardLinks(hardLinkIds)
+	}
+
 	if isCollection {
 		collectionName := entry.Name()
 		f.doDeleteCollection(collectionName)
@@ -53,7 +64,7 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	return nil
 }
 
-func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32) (chunks []*filer_pb.FileChunk, err error) {
+func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32) (chunks []*filer_pb.FileChunk, hardlinkIds []HardLinkId, err error) {
 
 	lastFileName := ""
 	includeLastFile := false
@@ -61,26 +72,33 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 		entries, err := f.ListDirectoryEntries(ctx, entry.FullPath, lastFileName, includeLastFile, PaginationSize, "")
 		if err != nil {
 			glog.Errorf("list folder %s: %v", entry.FullPath, err)
-			return nil, fmt.Errorf("list folder %s: %v", entry.FullPath, err)
+			return nil, nil, fmt.Errorf("list folder %s: %v", entry.FullPath, err)
 		}
 		if lastFileName == "" && !isRecursive && len(entries) > 0 {
 			// only for first iteration in the loop
 			glog.Errorf("deleting a folder %s has children: %+v ...", entry.FullPath, entries[0].Name())
-			return nil, fmt.Errorf("fail to delete non-empty folder: %s", entry.FullPath)
+			return nil, nil,fmt.Errorf("fail to delete non-empty folder: %s", entry.FullPath)
 		}
 
 		for _, sub := range entries {
 			lastFileName = sub.Name()
 			var dirChunks []*filer_pb.FileChunk
+			var dirHardLinkIds []HardLinkId
 			if sub.IsDirectory() {
-				dirChunks, err = f.doBatchDeleteFolderMetaAndData(ctx, sub, isRecursive, ignoreRecursiveError, shouldDeleteChunks, false, nil)
+				dirChunks, dirHardLinkIds, err = f.doBatchDeleteFolderMetaAndData(ctx, sub, isRecursive, ignoreRecursiveError, shouldDeleteChunks, false, nil)
 				chunks = append(chunks, dirChunks...)
+				hardlinkIds = append(hardlinkIds, dirHardLinkIds...)
 			} else {
 				f.NotifyUpdateEvent(ctx, sub, nil, shouldDeleteChunks, isFromOtherCluster, nil)
-				chunks = append(chunks, sub.Chunks...)
+				if len(sub.HardLinkId) != 0 {
+					// hard link chunk data are deleted separately
+					hardlinkIds = append(hardlinkIds, sub.HardLinkId)
+				} else {
+					chunks = append(chunks, sub.Chunks...)
+				}
 			}
 			if err != nil && !ignoreRecursiveError {
-				return nil, err
+				return nil, nil, err
 			}
 		}
 
@@ -92,12 +110,12 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 	glog.V(3).Infof("deleting directory %v delete %d chunks: %v", entry.FullPath, len(chunks), shouldDeleteChunks)
 
 	if storeDeletionErr := f.Store.DeleteFolderChildren(ctx, entry.FullPath); storeDeletionErr != nil {
-		return nil, fmt.Errorf("filer store delete: %v", storeDeletionErr)
+		return nil, nil, fmt.Errorf("filer store delete: %v", storeDeletionErr)
 	}
 
 	f.NotifyUpdateEvent(ctx, entry, nil, shouldDeleteChunks, isFromOtherCluster, signatures)
 
-	return chunks, nil
+	return chunks, hardlinkIds, nil
 }
 
 func (f *Filer) doDeleteEntryMetaAndData(ctx context.Context, entry *Entry, shouldDeleteChunks bool, isFromOtherCluster bool, signatures []int32) (err error) {
diff --git a/weed/filer/filerstore.go b/weed/filer/filerstore.go
index d313b7ba3..11e30878d 100644
--- a/weed/filer/filerstore.go
+++ b/weed/filer/filerstore.go
@@ -24,7 +24,7 @@ type FilerStore interface {
 	Initialize(configuration util.Configuration, prefix string) error
 	InsertEntry(context.Context, *Entry) error
 	UpdateEntry(context.Context, *Entry) (err error)
-	// err == filer2.ErrNotFound if not found
+	// err == filer_pb.ErrNotFound if not found
 	FindEntry(context.Context, util.FullPath) (entry *Entry, err error)
 	DeleteEntry(context.Context, util.FullPath) (err error)
 	DeleteFolderChildren(context.Context, util.FullPath) (err error)
@@ -42,6 +42,11 @@ type FilerStore interface {
 	Shutdown()
 }
 
+type VirtualFilerStore interface {
+	FilerStore
+	DeleteHardLink(ctx context.Context, hardLinkId HardLinkId) error
+}
+
 type FilerStoreWrapper struct {
 	ActualStore FilerStore
 }
@@ -74,6 +79,11 @@ func (fsw *FilerStoreWrapper) InsertEntry(ctx context.Context, entry *Entry) err
 	if entry.Mime == "application/octet-stream" {
 		entry.Mime = ""
 	}
+
+	if err := fsw.handleUpdateToHardLinks(ctx, entry); err != nil {
+		return err
+	}
+
 	return fsw.ActualStore.InsertEntry(ctx, entry)
 }
 
@@ -88,6 +98,11 @@ func (fsw *FilerStoreWrapper) UpdateEntry(ctx context.Context, entry *Entry) err
 	if entry.Mime == "application/octet-stream" {
 		entry.Mime = ""
 	}
+
+	if err := fsw.handleUpdateToHardLinks(ctx, entry); err != nil {
+		return err
+	}
+
 	return fsw.ActualStore.UpdateEntry(ctx, entry)
 }
 
@@ -102,6 +117,9 @@ func (fsw *FilerStoreWrapper) FindEntry(ctx context.Context, fp util.FullPath) (
 	if err != nil {
 		return nil, err
 	}
+
+	fsw.maybeReadHardLink(ctx, entry)
+
 	filer_pb.AfterEntryDeserialization(entry.Chunks)
 	return
 }
@@ -113,6 +131,17 @@ func (fsw *FilerStoreWrapper) DeleteEntry(ctx context.Context, fp util.FullPath)
 		stats.FilerStoreHistogram.WithLabelValues(fsw.ActualStore.GetName(), "delete").Observe(time.Since(start).Seconds())
 	}()
 
+	existingEntry, findErr := fsw.FindEntry(ctx, fp)
+	if findErr == filer_pb.ErrNotFound {
+		return nil
+	}
+	if len(existingEntry.HardLinkId) != 0 {
+		// remove hard link
+		if err = fsw.DeleteHardLink(ctx, existingEntry.HardLinkId); err != nil {
+			return err
+		}
+	}
+
 	return fsw.ActualStore.DeleteEntry(ctx, fp)
 }
 
@@ -138,6 +167,7 @@ func (fsw *FilerStoreWrapper) ListDirectoryEntries(ctx context.Context, dirPath
 		return nil, err
 	}
 	for _, entry := range entries {
+		fsw.maybeReadHardLink(ctx, entry)
 		filer_pb.AfterEntryDeserialization(entry.Chunks)
 	}
 	return entries, err
@@ -157,6 +187,7 @@ func (fsw *FilerStoreWrapper) ListDirectoryPrefixedEntries(ctx context.Context,
 		return nil, err
 	}
 	for _, entry := range entries {
+		fsw.maybeReadHardLink(ctx, entry)
 		filer_pb.AfterEntryDeserialization(entry.Chunks)
 	}
 	return entries, nil
diff --git a/weed/filer/filerstore_hardlink.go b/weed/filer/filerstore_hardlink.go
new file mode 100644
index 000000000..0fbf8310e
--- /dev/null
+++ b/weed/filer/filerstore_hardlink.go
@@ -0,0 +1,96 @@
+package filer
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+func (fsw *FilerStoreWrapper) handleUpdateToHardLinks(ctx context.Context, entry *Entry) error {
+	if len(entry.HardLinkId) == 0 {
+		return nil
+	}
+	// handle hard links
+	if err := fsw.setHardLink(ctx, entry); err != nil {
+		return fmt.Errorf("setHardLink %d: %v", entry.HardLinkId, err)
+	}
+
+	// check what is existing entry
+	existingEntry, err := fsw.ActualStore.FindEntry(ctx, entry.FullPath)
+	if err != nil && err != filer_pb.ErrNotFound {
+		return fmt.Errorf("update existing entry %s: %v", entry.FullPath, err)
+	}
+
+	// remove old hard link
+	if err == nil && len(existingEntry.HardLinkId) != 0 && bytes.Compare(existingEntry.HardLinkId, entry.HardLinkId) != 0 {
+		if err = fsw.DeleteHardLink(ctx, existingEntry.HardLinkId); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (fsw *FilerStoreWrapper) setHardLink(ctx context.Context, entry *Entry) error {
+	if len(entry.HardLinkId) == 0 {
+		return nil
+	}
+	key := entry.HardLinkId
+
+	newBlob, encodeErr := entry.EncodeAttributesAndChunks()
+	if encodeErr != nil {
+		return encodeErr
+	}
+
+	return fsw.KvPut(ctx, key, newBlob)
+}
+
+func (fsw *FilerStoreWrapper) maybeReadHardLink(ctx context.Context, entry *Entry) error {
+	if len(entry.HardLinkId) == 0 {
+		return nil
+	}
+	key := entry.HardLinkId
+
+	value, err := fsw.KvGet(ctx, key)
+	if err != nil {
+		glog.Errorf("read %s hardlink %d: %v", entry.FullPath, entry.HardLinkId, err)
+		return err
+	}
+
+	if err = entry.DecodeAttributesAndChunks(value); err != nil {
+		glog.Errorf("decode %s hardlink %d: %v", entry.FullPath, entry.HardLinkId, err)
+		return err
+	}
+
+	return nil
+}
+
+func (fsw *FilerStoreWrapper) DeleteHardLink(ctx context.Context, hardLinkId HardLinkId) error {
+	key := hardLinkId
+	value, err := fsw.KvGet(ctx, key)
+	if err == ErrKvNotFound {
+		return nil
+	}
+	if err != nil {
+		return err
+	}
+
+	entry := &Entry{}
+	if err = entry.DecodeAttributesAndChunks(value); err != nil {
+		return err
+	}
+
+	entry.HardLinkCounter--
+	if entry.HardLinkCounter <= 0 {
+		return fsw.KvDelete(ctx, key)
+	}
+
+	newBlob, encodeErr := entry.EncodeAttributesAndChunks()
+	if encodeErr != nil {
+		return encodeErr
+	}
+
+	return fsw.KvPut(ctx, key, newBlob)
+
+}
diff --git a/weed/filer/stream.go b/weed/filer/stream.go
index 416359ebf..dc6e414ca 100644
--- a/weed/filer/stream.go
+++ b/weed/filer/stream.go
@@ -32,7 +32,7 @@ func StreamContent(masterClient *wdclient.MasterClient, w io.Writer, chunks []*f
 	for _, chunkView := range chunkViews {
 
 		urlString := fileId2Url[chunkView.FileId]
-		err := util.ReadUrlAsStream(urlString+"?readDeleted=true", chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
+		err := util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
 			w.Write(data)
 		})
 		if err != nil {
@@ -63,7 +63,7 @@ func ReadAll(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk)
 			glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
 			return nil, err
 		}
-		err = util.ReadUrlAsStream(urlString+"?readDeleted=true", chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
+		err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
 			buffer.Write(data)
 		})
 		if err != nil {
@@ -175,7 +175,7 @@ func (c *ChunkStreamReader) fetchChunkToBuffer(chunkView *ChunkView) error {
 		return err
 	}
 	var buffer bytes.Buffer
-	err = util.ReadUrlAsStream(urlString+"?readDeleted=true", chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
+	err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
 		buffer.Write(data)
 	})
 	if err != nil {
diff --git a/weed/filesys/dir.go b/weed/filesys/dir.go
index cef0d6e3b..7d93dbd9f 100644
--- a/weed/filesys/dir.go
+++ b/weed/filesys/dir.go
@@ -267,6 +267,9 @@ func (dir *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.
 		resp.Attr.Mode = os.FileMode(entry.Attributes.FileMode)
 		resp.Attr.Gid = entry.Attributes.Gid
 		resp.Attr.Uid = entry.Attributes.Uid
+		if entry.HardLinkCounter > 0 {
+			resp.Attr.Nlink = uint32(entry.HardLinkCounter)
+		}
 
 		return node, nil
 	}
@@ -328,7 +331,8 @@ func (dir *Dir) removeOneFile(req *fuse.RemoveRequest) error {
 
 	// first, ensure the filer store can correctly delete
 	glog.V(3).Infof("remove file: %v", req)
-	err = filer_pb.Remove(dir.wfs, dir.FullPath(), req.Name, false, false, false, false, []int32{dir.wfs.signature})
+	isDeleteData := entry.HardLinkCounter <= 1
+	err = filer_pb.Remove(dir.wfs, dir.FullPath(), req.Name, isDeleteData, false, false, false, []int32{dir.wfs.signature})
 	if err != nil {
 		glog.V(3).Infof("not found remove file %s/%s: %v", dir.FullPath(), req.Name, err)
 		return fuse.ENOENT
@@ -339,7 +343,9 @@ func (dir *Dir) removeOneFile(req *fuse.RemoveRequest) error {
 	dir.wfs.fsNodeCache.DeleteFsNode(filePath)
 
 	// delete the chunks last
-	dir.wfs.deleteFileChunks(entry.Chunks)
+	if isDeleteData {
+		dir.wfs.deleteFileChunks(entry.Chunks)
+	}
 
 	return nil
 
diff --git a/weed/filesys/dir_link.go b/weed/filesys/dir_link.go
index 486dd0c9b..368ded442 100644
--- a/weed/filesys/dir_link.go
+++ b/weed/filesys/dir_link.go
@@ -2,6 +2,7 @@ package filesys
 
 import (
 	"context"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"os"
 	"syscall"
 	"time"
@@ -13,9 +14,82 @@ import (
 	"github.com/seaweedfs/fuse/fs"
 )
 
+var _ = fs.NodeLinker(&Dir{})
 var _ = fs.NodeSymlinker(&Dir{})
 var _ = fs.NodeReadlinker(&File{})
 
+func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (fs.Node, error) {
+
+	oldFile, ok := old.(*File)
+	if !ok {
+		glog.Errorf("old node is not a file: %+v", old)
+	}
+
+	glog.V(4).Infof("Link: %v/%v -> %v/%v", oldFile.dir.FullPath(), oldFile.Name, dir.FullPath(), req.NewName)
+
+	if err := oldFile.maybeLoadEntry(ctx); err != nil {
+		return nil, err
+	}
+
+	// update old file to hardlink mode
+	if len(oldFile.entry.HardLinkId) == 0 {
+		oldFile.entry.HardLinkId = util.RandomBytes(16)
+		oldFile.entry.HardLinkCounter = 1
+	}
+	oldFile.entry.HardLinkCounter++
+	updateOldEntryRequest := &filer_pb.UpdateEntryRequest{
+		Directory:  oldFile.dir.FullPath(),
+		Entry:      oldFile.entry,
+		Signatures: []int32{dir.wfs.signature},
+	}
+
+	// CreateLink 1.2 : update new file to hardlink mode
+	request := &filer_pb.CreateEntryRequest{
+		Directory: dir.FullPath(),
+		Entry: &filer_pb.Entry{
+			Name:            req.NewName,
+			IsDirectory:     false,
+			Attributes:      oldFile.entry.Attributes,
+			Chunks:          oldFile.entry.Chunks,
+			Extended:        oldFile.entry.Extended,
+			HardLinkId:      oldFile.entry.HardLinkId,
+			HardLinkCounter: oldFile.entry.HardLinkCounter,
+		},
+		Signatures: []int32{dir.wfs.signature},
+	}
+
+	// apply changes to the filer, and also apply to local metaCache
+	err := dir.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		dir.wfs.mapPbIdFromLocalToFiler(request.Entry)
+		defer dir.wfs.mapPbIdFromFilerToLocal(request.Entry)
+
+		if err := filer_pb.UpdateEntry(client, updateOldEntryRequest); err != nil {
+			glog.V(0).Infof("Link %v/%v -> %s/%s: %v", oldFile.dir.FullPath(), oldFile.Name, dir.FullPath(), req.NewName, err)
+			return fuse.EIO
+		}
+		dir.wfs.metaCache.UpdateEntry(context.Background(), filer.FromPbEntry(updateOldEntryRequest.Directory, updateOldEntryRequest.Entry))
+
+		if err := filer_pb.CreateEntry(client, request); err != nil {
+			glog.V(0).Infof("Link %v/%v -> %s/%s: %v", oldFile.dir.FullPath(), oldFile.Name, dir.FullPath(), req.NewName, err)
+			return fuse.EIO
+		}
+		dir.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry))
+
+		return nil
+	})
+
+	// create new file node
+	newNode := dir.newFile(req.NewName, request.Entry)
+	newFile := newNode.(*File)
+	if err := newFile.maybeLoadEntry(ctx); err != nil {
+		return nil, err
+	}
+
+	return newFile, err
+
+}
+
 func (dir *Dir) Symlink(ctx context.Context, req *fuse.SymlinkRequest) (fs.Node, error) {
 
 	glog.V(4).Infof("Symlink: %v/%v to %v", dir.FullPath(), req.NewName, req.Target)
diff --git a/weed/filesys/file.go b/weed/filesys/file.go
index d130d5898..98ee010d8 100644
--- a/weed/filesys/file.go
+++ b/weed/filesys/file.go
@@ -67,6 +67,9 @@ func (file *File) Attr(ctx context.Context, attr *fuse.Attr) error {
 	attr.Uid = file.entry.Attributes.Uid
 	attr.Blocks = attr.Size/blockSize + 1
 	attr.BlockSize = uint32(file.wfs.option.ChunkSizeLimit)
+	if file.entry.HardLinkCounter > 0 {
+		attr.Nlink = uint32(file.entry.HardLinkCounter)
+	}
 
 	return nil
 
@@ -250,7 +253,7 @@ func (file *File) Forget() {
 }
 
 func (file *File) maybeLoadEntry(ctx context.Context) error {
-	if file.entry == nil && file.isOpen <= 0 {
+	if (file.entry == nil || len(file.entry.HardLinkId) != 0) && file.isOpen <= 0 {
 		entry, err := file.wfs.maybeLoadEntry(file.dir.FullPath(), file.Name)
 		if err != nil {
 			glog.V(3).Infof("maybeLoadEntry file %s/%s: %v", file.dir.FullPath(), file.Name, err)
diff --git a/weed/filesys/meta_cache/meta_cache.go b/weed/filesys/meta_cache/meta_cache.go
index 06f634c72..bb81d6d27 100644
--- a/weed/filesys/meta_cache/meta_cache.go
+++ b/weed/filesys/meta_cache/meta_cache.go
@@ -8,7 +8,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/filer/leveldb"
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/util/bounded_tree"
 )
@@ -17,7 +16,7 @@ import (
 // e.g. fill fileId field for chunks
 
 type MetaCache struct {
-	localStore filer.FilerStore
+	localStore filer.VirtualFilerStore
 	sync.RWMutex
 	visitedBoundary *bounded_tree.BoundedTree
 	uidGidMapper    *UidGidMapper
@@ -31,7 +30,7 @@ func NewMetaCache(dbFolder string, uidGidMapper *UidGidMapper) *MetaCache {
 	}
 }
 
-func openMetaStore(dbFolder string) filer.FilerStore {
+func openMetaStore(dbFolder string) filer.VirtualFilerStore {
 
 	os.RemoveAll(dbFolder)
 	os.MkdirAll(dbFolder, 0755)
@@ -45,7 +44,7 @@ func openMetaStore(dbFolder string) filer.FilerStore {
 		glog.Fatalf("Failed to initialize metadata cache store for %s: %+v", store.GetName(), err)
 	}
 
-	return store
+	return filer.NewFilerStoreWrapper(store)
 
 }
 
@@ -56,7 +55,6 @@ func (mc *MetaCache) InsertEntry(ctx context.Context, entry *filer.Entry) error
 }
 
 func (mc *MetaCache) doInsertEntry(ctx context.Context, entry *filer.Entry) error {
-	filer_pb.BeforeEntrySerialization(entry.Chunks)
 	return mc.localStore.InsertEntry(ctx, entry)
 }
 
@@ -94,7 +92,6 @@ func (mc *MetaCache) AtomicUpdateEntryFromFiler(ctx context.Context, oldPath uti
 func (mc *MetaCache) UpdateEntry(ctx context.Context, entry *filer.Entry) error {
 	mc.Lock()
 	defer mc.Unlock()
-	filer_pb.BeforeEntrySerialization(entry.Chunks)
 	return mc.localStore.UpdateEntry(ctx, entry)
 }
 
@@ -106,7 +103,6 @@ func (mc *MetaCache) FindEntry(ctx context.Context, fp util.FullPath) (entry *fi
 		return nil, err
 	}
 	mc.mapIdFromFilerToLocal(entry)
-	filer_pb.AfterEntryDeserialization(entry.Chunks)
 	return
 }
 
@@ -126,7 +122,6 @@ func (mc *MetaCache) ListDirectoryEntries(ctx context.Context, dirPath util.Full
 	}
 	for _, entry := range entries {
 		mc.mapIdFromFilerToLocal(entry)
-		filer_pb.AfterEntryDeserialization(entry.Chunks)
 	}
 	return entries, err
 }
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index fa491138e..ef31a9258 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -206,8 +206,14 @@ func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.
 }
 
 func (wfs *WFS) mapPbIdFromFilerToLocal(entry *filer_pb.Entry) {
+	if entry.Attributes == nil {
+		return
+	}
 	entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.FilerToLocal(entry.Attributes.Uid, entry.Attributes.Gid)
 }
 func (wfs *WFS) mapPbIdFromLocalToFiler(entry *filer_pb.Entry) {
+	if entry.Attributes == nil {
+		return
+	}
 	entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.LocalToFiler(entry.Attributes.Uid, entry.Attributes.Gid)
 }
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 9a72bc976..daa20c378 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -95,6 +95,8 @@ message Entry {
     repeated FileChunk chunks = 3;
     FuseAttributes attributes = 4;
     map<string, bytes> extended = 5;
+    bytes hard_link_id = 7;
+    int32 hard_link_counter = 8; // only exists in hard link meta data
 }
 
 message FullEntry {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 00948593c..bf3adb78a 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -262,11 +262,13 @@ type Entry struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name        string            `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	IsDirectory bool              `protobuf:"varint,2,opt,name=is_directory,json=isDirectory,proto3" json:"is_directory,omitempty"`
-	Chunks      []*FileChunk      `protobuf:"bytes,3,rep,name=chunks,proto3" json:"chunks,omitempty"`
-	Attributes  *FuseAttributes   `protobuf:"bytes,4,opt,name=attributes,proto3" json:"attributes,omitempty"`
-	Extended    map[string][]byte `protobuf:"bytes,5,rep,name=extended,proto3" json:"extended,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Name            string            `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	IsDirectory     bool              `protobuf:"varint,2,opt,name=is_directory,json=isDirectory,proto3" json:"is_directory,omitempty"`
+	Chunks          []*FileChunk      `protobuf:"bytes,3,rep,name=chunks,proto3" json:"chunks,omitempty"`
+	Attributes      *FuseAttributes   `protobuf:"bytes,4,opt,name=attributes,proto3" json:"attributes,omitempty"`
+	Extended        map[string][]byte `protobuf:"bytes,5,rep,name=extended,proto3" json:"extended,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	HardLinkId      []byte            `protobuf:"bytes,7,opt,name=hard_link_id,json=hardLinkId,proto3" json:"hard_link_id,omitempty"`
+	HardLinkCounter int32             `protobuf:"varint,8,opt,name=hard_link_counter,json=hardLinkCounter,proto3" json:"hard_link_counter,omitempty"` // only exists in hard link meta data
 }
 
 func (x *Entry) Reset() {
@@ -336,6 +338,20 @@ func (x *Entry) GetExtended() map[string][]byte {
 	return nil
 }
 
+func (x *Entry) GetHardLinkId() []byte {
+	if x != nil {
+		return x.HardLinkId
+	}
+	return nil
+}
+
+func (x *Entry) GetHardLinkCounter() int32 {
+	if x != nil {
+		return x.HardLinkCounter
+	}
+	return 0
+}
+
 type FullEntry struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2915,7 +2931,7 @@ var file_filer_proto_rawDesc = []byte{
 	0x22, 0x3c, 0x0a, 0x13, 0x4c, 0x69, 0x73, 0x74, 0x45, 0x6e, 0x74, 0x72, 0x69, 0x65, 0x73, 0x52,
 	0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x25, 0x0a, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79,
 	0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x0f, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70,
-	0x62, 0x2e, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x22, 0x9d,
+	0x62, 0x2e, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x22, 0xeb,
 	0x02, 0x0a, 0x05, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65,
 	0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x21, 0x0a, 0x0c,
 	0x69, 0x73, 0x5f, 0x64, 0x69, 0x72, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x79, 0x18, 0x02, 0x20, 0x01,
@@ -2930,419 +2946,424 @@ var file_filer_proto_rawDesc = []byte{
 	0x65, 0x64, 0x18, 0x05, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1d, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72,
 	0x5f, 0x70, 0x62, 0x2e, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x2e, 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64,
 	0x65, 0x64, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x08, 0x65, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x65,
-	0x64, 0x1a, 0x3b, 0x0a, 0x0d, 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x65, 0x64, 0x45, 0x6e, 0x74,
-	0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52,
-	0x03, 0x6b, 0x65, 0x79, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20,
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+	0x65, 0x64, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x28, 0x01, 0x30, 0x01,
+	0x12, 0x4f, 0x0a, 0x0c, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x65, 0x42, 0x72, 0x6f, 0x6b, 0x65, 0x72,
+	0x12, 0x1d, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4c, 0x6f, 0x63, 0x61,
+	0x74, 0x65, 0x42, 0x72, 0x6f, 0x6b, 0x65, 0x72, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a,
+	0x1e, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4c, 0x6f, 0x63, 0x61, 0x74,
+	0x65, 0x42, 0x72, 0x6f, 0x6b, 0x65, 0x72, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22,
+	0x00, 0x12, 0x3a, 0x0a, 0x05, 0x4b, 0x76, 0x47, 0x65, 0x74, 0x12, 0x16, 0x2e, 0x66, 0x69, 0x6c,
+	0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76, 0x47, 0x65, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65,
+	0x73, 0x74, 0x1a, 0x17, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76,
+	0x47, 0x65, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x12, 0x3a, 0x0a,
+	0x05, 0x4b, 0x76, 0x50, 0x75, 0x74, 0x12, 0x16, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70,
+	0x62, 0x2e, 0x4b, 0x76, 0x50, 0x75, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x17,
+	0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76, 0x50, 0x75, 0x74, 0x52,
+	0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x4f, 0x0a, 0x10, 0x73, 0x65, 0x61,
+	0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2e, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x42, 0x0a, 0x46,
+	0x69, 0x6c, 0x65, 0x72, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x5a, 0x2f, 0x67, 0x69, 0x74, 0x68, 0x75,
+	0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f,
+	0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70,
+	0x62, 0x2f, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
diff --git a/weed/pb/filer_pb/filer_pb_helper.go b/weed/pb/filer_pb/filer_pb_helper.go
index b6376060f..bc0fac36c 100644
--- a/weed/pb/filer_pb/filer_pb_helper.go
+++ b/weed/pb/filer_pb/filer_pb_helper.go
@@ -96,6 +96,15 @@ func CreateEntry(client SeaweedFilerClient, request *CreateEntryRequest) error {
 	return nil
 }
 
+func UpdateEntry(client SeaweedFilerClient, request *UpdateEntryRequest) error {
+	_, err := client.UpdateEntry(context.Background(), request)
+	if err != nil {
+		glog.V(1).Infof("update entry %s/%s :%v", request.Directory, request.Entry.Name, err)
+		return fmt.Errorf("UpdateEntry: %v", err)
+	}
+	return nil
+}
+
 func LookupEntry(client SeaweedFilerClient, request *LookupDirectoryEntryRequest) (*LookupDirectoryEntryResponse, error) {
 	resp, err := client.LookupDirectoryEntry(context.Background(), request)
 	if err != nil {
diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index c5f0dabf6..13fae72a3 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -220,6 +220,15 @@ func (s3a *S3ApiServer) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *h
 
 }
 
+var passThroughHeaders = []string{
+	"response-cache-control",
+	"response-content-disposition",
+	"response-content-encoding",
+	"response-content-language",
+	"response-content-type",
+	"response-expires",
+}
+
 func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, destUrl string, responseFn func(proxyResponse *http.Response, w http.ResponseWriter)) {
 
 	glog.V(2).Infof("s3 proxying %s to %s", r.Method, destUrl)
@@ -236,6 +245,19 @@ func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, des
 	proxyReq.Header.Set("X-Forwarded-For", r.RemoteAddr)
 
 	for header, values := range r.Header {
+		// handle s3 related headers
+		passed := false
+		for _, h := range passThroughHeaders {
+			if strings.ToLower(header) == h && len(values) > 0 {
+				proxyReq.Header.Add(header[len("response-"):], values[0])
+				passed = true
+				break
+			}
+		}
+		if passed {
+			continue
+		}
+		// handle other headers
 		for _, value := range values {
 			proxyReq.Header.Add(header, value)
 		}
@@ -258,6 +280,7 @@ func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, des
 	responseFn(resp, w)
 
 }
+
 func passThroughResponse(proxyResponse *http.Response, w http.ResponseWriter) {
 	for k, v := range proxyResponse.Header {
 		w.Header()[k] = v
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 41dcedba5..ecd23413f 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -37,6 +37,8 @@ func (fs *FilerServer) LookupDirectoryEntry(ctx context.Context, req *filer_pb.L
 			Attributes:  filer.EntryAttributeToPb(entry),
 			Chunks:      entry.Chunks,
 			Extended:    entry.Extended,
+			HardLinkId:  entry.HardLinkId,
+			HardLinkCounter: entry.HardLinkCounter,
 		},
 	}, nil
 }
@@ -80,6 +82,8 @@ func (fs *FilerServer) ListEntries(req *filer_pb.ListEntriesRequest, stream file
 					Chunks:      entry.Chunks,
 					Attributes:  filer.EntryAttributeToPb(entry),
 					Extended:    entry.Extended,
+					HardLinkId:  entry.HardLinkId,
+					HardLinkCounter: entry.HardLinkCounter,
 				},
 			}); err != nil {
 				return err
@@ -154,17 +158,13 @@ func (fs *FilerServer) CreateEntry(ctx context.Context, req *filer_pb.CreateEntr
 		return &filer_pb.CreateEntryResponse{}, fmt.Errorf("CreateEntry cleanupChunks %s %s: %v", req.Directory, req.Entry.Name, err2)
 	}
 
-	if req.Entry.Attributes == nil {
-		glog.V(3).Infof("CreateEntry %s: nil attributes", filepath.Join(req.Directory, req.Entry.Name))
-		resp.Error = fmt.Sprintf("can not create entry with empty attributes")
-		return
-	}
-
 	createErr := fs.filer.CreateEntry(ctx, &filer.Entry{
 		FullPath: util.JoinPath(req.Directory, req.Entry.Name),
 		Attr:     filer.PbToEntryAttribute(req.Entry.Attributes),
 		Chunks:   chunks,
 		Extended: req.Entry.Extended,
+		HardLinkId: filer.HardLinkId(req.Entry.HardLinkId),
+		HardLinkCounter: req.Entry.HardLinkCounter,
 	}, req.OExcl, req.IsFromOtherCluster, req.Signatures)
 
 	if createErr == nil {
@@ -197,6 +197,8 @@ func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntr
 		Attr:     entry.Attr,
 		Extended: req.Entry.Extended,
 		Chunks:   chunks,
+		HardLinkId: filer.HardLinkId(req.Entry.HardLinkId),
+		HardLinkCounter: req.Entry.HardLinkCounter,
 	}
 
 	glog.V(3).Infof("updating %s: %+v, chunks %d: %v => %+v, chunks %d: %v, extended: %v => %v",
@@ -225,12 +227,13 @@ func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntr
 
 	if err = fs.filer.UpdateEntry(ctx, entry, newEntry); err == nil {
 		fs.filer.DeleteChunks(garbage)
+
+		fs.filer.NotifyUpdateEvent(ctx, entry, newEntry, true, req.IsFromOtherCluster, req.Signatures)
+
 	} else {
 		glog.V(3).Infof("UpdateEntry %s: %v", filepath.Join(req.Directory, req.Entry.Name), err)
 	}
 
-	fs.filer.NotifyUpdateEvent(ctx, entry, newEntry, true, req.IsFromOtherCluster, req.Signatures)
-
 	return &filer_pb.UpdateEntryResponse{}, err
 }
 
@@ -250,15 +253,17 @@ func (fs *FilerServer) cleanupChunks(existingEntry *filer.Entry, newEntry *filer
 	chunks, coveredChunks := filer.CompactFileChunks(fs.lookupFileId, nonManifestChunks)
 	garbage = append(garbage, coveredChunks...)
 
-	chunks, err = filer.MaybeManifestize(fs.saveAsChunk(
-		newEntry.Attributes.Replication,
-		newEntry.Attributes.Collection,
-		"",
-		needle.SecondsToTTL(newEntry.Attributes.TtlSec),
-		false), chunks)
-	if err != nil {
-		// not good, but should be ok
-		glog.V(0).Infof("MaybeManifestize: %v", err)
+	if newEntry.Attributes != nil {
+		chunks, err = filer.MaybeManifestize(fs.saveAsChunk(
+			newEntry.Attributes.Replication,
+			newEntry.Attributes.Collection,
+			"",
+			needle.SecondsToTTL(newEntry.Attributes.TtlSec),
+			false), chunks)
+		if err != nil {
+			// not good, but should be ok
+			glog.V(0).Infof("MaybeManifestize: %v", err)
+		}
 	}
 
 	chunks = append(chunks, manifestChunks...)
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 4d6d424dc..ec0a4fb3e 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -157,7 +157,7 @@ func (fs *FilerServer) maybeStartMetrics() {
 		}
 	}
 
-	go stats.LoopPushingMetric("filer", stats.SourceName(fs.option.Port), stats.FilerGather, fs.metricsAddress, fs.metricsIntervalSec)
+	go stats.LoopPushingMetric("filer", stats.SourceName(fs.option.Port), fs.metricsAddress, fs.metricsIntervalSec)
 }
 
 func readFilerConfiguration(grpcDialOption grpc.DialOption, masterAddress string) (metricsAddress string, metricsIntervalSec int, err error) {
diff --git a/weed/server/volume_server.go b/weed/server/volume_server.go
index 5e9ec1369..83df32fdd 100644
--- a/weed/server/volume_server.go
+++ b/weed/server/volume_server.go
@@ -97,7 +97,7 @@ func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 	}
 
 	go vs.heartbeat()
-	go stats.LoopPushingMetric("volumeServer", fmt.Sprintf("%s:%d", ip, port), stats.VolumeServerGather, vs.metricsAddress, vs.metricsIntervalSec)
+	go stats.LoopPushingMetric("volumeServer", fmt.Sprintf("%s:%d", ip, port), vs.metricsAddress, vs.metricsIntervalSec)
 
 	return vs
 }
diff --git a/weed/stats/metrics.go b/weed/stats/metrics.go
index 29e7c8edf..d930caf0f 100644
--- a/weed/stats/metrics.go
+++ b/weed/stats/metrics.go
@@ -2,20 +2,21 @@ package stats
 
 import (
 	"fmt"
+	"log"
+	"net/http"
 	"os"
 	"strings"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/prometheus/client_golang/prometheus/push"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 )
 
 var (
-	FilerGather        = prometheus.NewRegistry()
-	VolumeServerGather = prometheus.NewRegistry()
-	S3Gather           = prometheus.NewRegistry()
+	Gather        = prometheus.NewRegistry()
 
 	FilerRequestCounter = prometheus.NewCounterVec(
 		prometheus.CounterOpts{
@@ -111,23 +112,23 @@ var (
 
 func init() {
 
-	FilerGather.MustRegister(FilerRequestCounter)
-	FilerGather.MustRegister(FilerRequestHistogram)
-	FilerGather.MustRegister(FilerStoreCounter)
-	FilerGather.MustRegister(FilerStoreHistogram)
-	FilerGather.MustRegister(prometheus.NewGoCollector())
+	Gather.MustRegister(FilerRequestCounter)
+	Gather.MustRegister(FilerRequestHistogram)
+	Gather.MustRegister(FilerStoreCounter)
+	Gather.MustRegister(FilerStoreHistogram)
+	Gather.MustRegister(prometheus.NewGoCollector())
 
-	VolumeServerGather.MustRegister(VolumeServerRequestCounter)
-	VolumeServerGather.MustRegister(VolumeServerRequestHistogram)
-	VolumeServerGather.MustRegister(VolumeServerVolumeCounter)
-	VolumeServerGather.MustRegister(VolumeServerMaxVolumeCounter)
-	VolumeServerGather.MustRegister(VolumeServerDiskSizeGauge)
+	Gather.MustRegister(VolumeServerRequestCounter)
+	Gather.MustRegister(VolumeServerRequestHistogram)
+	Gather.MustRegister(VolumeServerVolumeCounter)
+	Gather.MustRegister(VolumeServerMaxVolumeCounter)
+	Gather.MustRegister(VolumeServerDiskSizeGauge)
 
-	S3Gather.MustRegister(S3RequestCounter)
-	S3Gather.MustRegister(S3RequestHistogram)
+	Gather.MustRegister(S3RequestCounter)
+	Gather.MustRegister(S3RequestHistogram)
 }
 
-func LoopPushingMetric(name, instance string, gatherer *prometheus.Registry, addr string, intervalSeconds int) {
+func LoopPushingMetric(name, instance, addr string, intervalSeconds int) {
 
 	if addr == "" || intervalSeconds == 0 {
 		return
@@ -135,7 +136,7 @@ func LoopPushingMetric(name, instance string, gatherer *prometheus.Registry, add
 
 	glog.V(0).Infof("%s server sends metrics to %s every %d seconds", name, addr, intervalSeconds)
 
-	pusher := push.New(addr, name).Gatherer(gatherer).Grouping("instance", instance)
+	pusher := push.New(addr, name).Gatherer(Gather).Grouping("instance", instance)
 
 	for {
 		err := pusher.Push()
@@ -150,6 +151,14 @@ func LoopPushingMetric(name, instance string, gatherer *prometheus.Registry, add
 	}
 }
 
+func StartMetricsServer(port int) {
+	if port == 0 {
+		return
+	}
+	http.Handle("/metrics", promhttp.HandlerFor(Gather, promhttp.HandlerOpts{}))
+	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", port), nil))
+}
+
 func SourceName(port uint32) string {
 	hostname, err := os.Hostname()
 	if err != nil {
diff --git a/weed/topology/topology_vacuum.go b/weed/topology/topology_vacuum.go
index 789a01330..4f3d69627 100644
--- a/weed/topology/topology_vacuum.go
+++ b/weed/topology/topology_vacuum.go
@@ -165,17 +165,17 @@ func vacuumOneVolumeLayout(grpcDialOption grpc.DialOption, volumeLayout *VolumeL
 	volumeLayout.accessLock.RLock()
 	tmpMap := make(map[needle.VolumeId]*VolumeLocationList)
 	for vid, locationList := range volumeLayout.vid2location {
-		tmpMap[vid] = locationList
+		tmpMap[vid] = locationList.Copy()
 	}
 	volumeLayout.accessLock.RUnlock()
 
 	for vid, locationList := range tmpMap {
 
 		volumeLayout.accessLock.RLock()
-		isReadOnly, hasValue := volumeLayout.readonlyVolumes[vid]
+		isReadOnly := volumeLayout.readonlyVolumes.IsTrue(vid)
 		volumeLayout.accessLock.RUnlock()
 
-		if hasValue && isReadOnly {
+		if isReadOnly {
 			continue
 		}
 
diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index 9e84fd2da..e7659e0eb 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -13,14 +13,100 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 )
 
+type copyState int
+
+const (
+	noCopies copyState = 0 + iota
+	insufficientCopies
+	enoughCopies
+)
+
+type volumeState string
+
+const (
+	readOnlyState  volumeState = "ReadOnly"
+	oversizedState             = "Oversized"
+)
+
+type stateIndicator func(copyState) bool
+
+func ExistCopies() stateIndicator {
+	return func(state copyState) bool { return state != noCopies }
+}
+
+func NoCopies() stateIndicator {
+	return func(state copyState) bool { return state == noCopies }
+}
+
+type volumesBinaryState struct {
+	rp        *super_block.ReplicaPlacement
+	name      volumeState    // the name for volume state (eg. "Readonly", "Oversized")
+	indicator stateIndicator // indicate whether the volumes should be marked as `name`
+	copyMap   map[needle.VolumeId]*VolumeLocationList
+}
+
+func NewVolumesBinaryState(name volumeState, rp *super_block.ReplicaPlacement, indicator stateIndicator) *volumesBinaryState {
+	return &volumesBinaryState{
+		rp:        rp,
+		name:      name,
+		indicator: indicator,
+		copyMap:   make(map[needle.VolumeId]*VolumeLocationList),
+	}
+}
+
+func (v *volumesBinaryState) Dump() (res []uint32) {
+	for vid, list := range v.copyMap {
+		if v.indicator(v.copyState(list)) {
+			res = append(res, uint32(vid))
+		}
+	}
+	return
+}
+
+func (v *volumesBinaryState) IsTrue(vid needle.VolumeId) bool {
+	list, _ := v.copyMap[vid]
+	return v.indicator(v.copyState(list))
+}
+
+func (v *volumesBinaryState) Add(vid needle.VolumeId, dn *DataNode) {
+	list, _ := v.copyMap[vid]
+	if list != nil {
+		list.Set(dn)
+		return
+	}
+	list = NewVolumeLocationList()
+	list.Set(dn)
+	v.copyMap[vid] = list
+}
+
+func (v *volumesBinaryState) Remove(vid needle.VolumeId, dn *DataNode) {
+	list, _ := v.copyMap[vid]
+	if list != nil {
+		list.Remove(dn)
+		if list.Length() == 0 {
+			delete(v.copyMap, vid)
+		}
+	}
+}
+
+func (v *volumesBinaryState) copyState(list *VolumeLocationList) copyState {
+	if list == nil {
+		return noCopies
+	}
+	if list.Length() < v.rp.GetCopyCount() {
+		return insufficientCopies
+	}
+	return enoughCopies
+}
+
 // mapping from volume to its locations, inverted from server to volume
 type VolumeLayout struct {
 	rp               *super_block.ReplicaPlacement
 	ttl              *needle.TTL
 	vid2location     map[needle.VolumeId]*VolumeLocationList
-	writables        []needle.VolumeId        // transient array of writable volume id
-	readonlyVolumes  map[needle.VolumeId]bool // transient set of readonly volumes
-	oversizedVolumes map[needle.VolumeId]bool // set of oversized volumes
+	writables        []needle.VolumeId   // transient array of writable volume id
+	readonlyVolumes  *volumesBinaryState // readonly volumes
+	oversizedVolumes *volumesBinaryState // oversized volumes
 	volumeSizeLimit  uint64
 	replicationAsMin bool
 	accessLock       sync.RWMutex
@@ -38,8 +124,8 @@ func NewVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, volumeSi
 		ttl:              ttl,
 		vid2location:     make(map[needle.VolumeId]*VolumeLocationList),
 		writables:        *new([]needle.VolumeId),
-		readonlyVolumes:  make(map[needle.VolumeId]bool),
-		oversizedVolumes: make(map[needle.VolumeId]bool),
+		readonlyVolumes:  NewVolumesBinaryState(readOnlyState, rp, ExistCopies()),
+		oversizedVolumes: NewVolumesBinaryState(oversizedState, rp, ExistCopies()),
 		volumeSizeLimit:  volumeSizeLimit,
 		replicationAsMin: replicationAsMin,
 	}
@@ -54,7 +140,7 @@ func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
 	defer vl.accessLock.Unlock()
 
 	defer vl.ensureCorrectWritables(v)
-	defer vl.rememberOversizedVolume(v)
+	defer vl.rememberOversizedVolume(v, dn)
 
 	if _, ok := vl.vid2location[v.Id]; !ok {
 		vl.vid2location[v.Id] = NewVolumeLocationList()
@@ -66,24 +152,26 @@ func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
 			if vInfo.ReadOnly {
 				glog.V(1).Infof("vid %d removed from writable", v.Id)
 				vl.removeFromWritable(v.Id)
-				vl.readonlyVolumes[v.Id] = true
+				vl.readonlyVolumes.Add(v.Id, dn)
 				return
 			} else {
-				delete(vl.readonlyVolumes, v.Id)
+				vl.readonlyVolumes.Remove(v.Id, dn)
 			}
 		} else {
 			glog.V(1).Infof("vid %d removed from writable", v.Id)
 			vl.removeFromWritable(v.Id)
-			delete(vl.readonlyVolumes, v.Id)
+			vl.readonlyVolumes.Remove(v.Id, dn)
 			return
 		}
 	}
 
 }
 
-func (vl *VolumeLayout) rememberOversizedVolume(v *storage.VolumeInfo) {
+func (vl *VolumeLayout) rememberOversizedVolume(v *storage.VolumeInfo, dn *DataNode) {
 	if vl.isOversized(v) {
-		vl.oversizedVolumes[v.Id] = true
+		vl.oversizedVolumes.Add(v.Id, dn)
+	} else {
+		vl.oversizedVolumes.Remove(v.Id, dn)
 	}
 }
 
@@ -99,6 +187,8 @@ func (vl *VolumeLayout) UnRegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
 
 	if location.Remove(dn) {
 
+		vl.readonlyVolumes.Remove(v.Id, dn)
+		vl.oversizedVolumes.Remove(v.Id, dn)
 		vl.ensureCorrectWritables(v)
 
 		if location.Length() == 0 {
@@ -110,7 +200,7 @@ func (vl *VolumeLayout) UnRegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
 
 func (vl *VolumeLayout) ensureCorrectWritables(v *storage.VolumeInfo) {
 	if vl.enoughCopies(v.Id) && vl.isWritable(v) {
-		if _, ok := vl.oversizedVolumes[v.Id]; !ok {
+		if !vl.oversizedVolumes.IsTrue(v.Id) {
 			vl.setVolumeWritable(v.Id)
 		}
 	} else {
@@ -251,6 +341,8 @@ func (vl *VolumeLayout) SetVolumeUnavailable(dn *DataNode, vid needle.VolumeId)
 
 	if location, ok := vl.vid2location[vid]; ok {
 		if location.Remove(dn) {
+			vl.readonlyVolumes.Remove(vid, dn)
+			vl.oversizedVolumes.Remove(vid, dn)
 			if location.Length() < vl.rp.GetCopyCount() {
 				glog.V(0).Infoln("Volume", vid, "has", location.Length(), "replica, less than required", vl.rp.GetCopyCount())
 				return vl.removeFromWritable(vid)
@@ -315,7 +407,7 @@ func (vl *VolumeLayout) Stats() *VolumeLayoutStats {
 		size, fileCount := vll.Stats(vid, freshThreshold)
 		ret.FileCount += uint64(fileCount)
 		ret.UsedSize += size
-		if vl.readonlyVolumes[vid] {
+		if vl.readonlyVolumes.IsTrue(vid) {
 			ret.TotalSize += size
 		} else {
 			ret.TotalSize += vl.volumeSizeLimit
diff --git a/weed/topology/volume_layout_test.go b/weed/topology/volume_layout_test.go
new file mode 100644
index 000000000..e148d6107
--- /dev/null
+++ b/weed/topology/volume_layout_test.go
@@ -0,0 +1,116 @@
+package topology
+
+import (
+	"testing"
+
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
+)
+
+func TestVolumesBinaryState(t *testing.T) {
+	vids := []needle.VolumeId{
+		needle.VolumeId(1),
+		needle.VolumeId(2),
+		needle.VolumeId(3),
+		needle.VolumeId(4),
+		needle.VolumeId(5),
+	}
+
+	dns := []*DataNode{
+		&DataNode{
+			Ip:   "127.0.0.1",
+			Port: 8081,
+		},
+		&DataNode{
+			Ip:   "127.0.0.1",
+			Port: 8082,
+		},
+		&DataNode{
+			Ip:   "127.0.0.1",
+			Port: 8083,
+		},
+	}
+
+	rp, _ := super_block.NewReplicaPlacementFromString("002")
+
+	state_exist := NewVolumesBinaryState(readOnlyState, rp, ExistCopies())
+	state_exist.Add(vids[0], dns[0])
+	state_exist.Add(vids[0], dns[1])
+	state_exist.Add(vids[1], dns[2])
+	state_exist.Add(vids[2], dns[1])
+	state_exist.Add(vids[4], dns[1])
+	state_exist.Add(vids[4], dns[2])
+
+	state_no := NewVolumesBinaryState(readOnlyState, rp, NoCopies())
+	state_no.Add(vids[0], dns[0])
+	state_no.Add(vids[0], dns[1])
+	state_no.Add(vids[3], dns[1])
+
+	tests := []struct {
+		name                    string
+		state                   *volumesBinaryState
+		expectResult            []bool
+		update                  func()
+		expectResultAfterUpdate []bool
+	}{
+		{
+			name:         "mark true when exist copies",
+			state:        state_exist,
+			expectResult: []bool{true, true, true, false, true},
+			update: func() {
+				state_exist.Remove(vids[0], dns[2])
+				state_exist.Remove(vids[1], dns[2])
+				state_exist.Remove(vids[3], dns[2])
+				state_exist.Remove(vids[4], dns[1])
+				state_exist.Remove(vids[4], dns[2])
+			},
+			expectResultAfterUpdate: []bool{true, false, true, false, false},
+		},
+		{
+			name:         "mark true when inexist copies",
+			state:        state_no,
+			expectResult: []bool{false, true, true, false, true},
+			update: func() {
+				state_no.Remove(vids[0], dns[2])
+				state_no.Remove(vids[1], dns[2])
+				state_no.Add(vids[2], dns[1])
+				state_no.Remove(vids[3], dns[1])
+				state_no.Remove(vids[4], dns[2])
+			},
+			expectResultAfterUpdate: []bool{false, true, false, true, true},
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			var result []bool
+			for index, _ := range vids {
+				result = append(result, test.state.IsTrue(vids[index]))
+			}
+			if len(result) != len(test.expectResult) {
+				t.Fatalf("len(result) != len(expectResult), got %d, expected %d\n",
+					len(result), len(test.expectResult))
+			}
+			for index, val := range result {
+				if val != test.expectResult[index] {
+					t.Fatalf("result not matched, index %d, got %v, expect %v\n",
+						index, val, test.expectResult[index])
+				}
+			}
+			test.update()
+			var updateResult []bool
+			for index, _ := range vids {
+				updateResult = append(updateResult, test.state.IsTrue(vids[index]))
+			}
+			if len(updateResult) != len(test.expectResultAfterUpdate) {
+				t.Fatalf("len(updateResult) != len(expectResultAfterUpdate), got %d, expected %d\n",
+					len(updateResult), len(test.expectResultAfterUpdate))
+			}
+			for index, val := range updateResult {
+				if val != test.expectResultAfterUpdate[index] {
+					t.Fatalf("update result not matched, index %d, got %v, expect %v\n",
+						index, val, test.expectResultAfterUpdate[index])
+				}
+			}
+		})
+	}
+}
diff --git a/weed/topology/volume_location_list.go b/weed/topology/volume_location_list.go
index 8905c54b5..6acd70f2f 100644
--- a/weed/topology/volume_location_list.go
+++ b/weed/topology/volume_location_list.go
@@ -18,6 +18,14 @@ func (dnll *VolumeLocationList) String() string {
 	return fmt.Sprintf("%v", dnll.list)
 }
 
+func (dnll *VolumeLocationList) Copy() *VolumeLocationList {
+	list := make([]*DataNode, len(dnll.list))
+	copy(list, dnll.list)
+	return &VolumeLocationList{
+		list: list,
+	}
+}
+
 func (dnll *VolumeLocationList) Head() *DataNode {
 	//mark first node as master volume
 	return dnll.list[0]
diff --git a/weed/util/bytes.go b/weed/util/bytes.go
index 82e4ddeef..67e6876fa 100644
--- a/weed/util/bytes.go
+++ b/weed/util/bytes.go
@@ -142,3 +142,9 @@ func RandomInt32() int32 {
 	rand.Read(buf)
 	return int32(BytesToUint32(buf))
 }
+
+func RandomBytes(byteCount int) []byte {
+	buf := make([]byte, byteCount)
+	rand.Read(buf)
+	return buf
+}