diff --git a/weed/server/filer_server_handlers_read.go b/weed/server/filer_server_handlers_read.go
index ac6aea056..43b58a94a 100644
--- a/weed/server/filer_server_handlers_read.go
+++ b/weed/server/filer_server_handlers_read.go
@@ -162,6 +162,7 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 		if offset+size <= int64(len(entry.Content)) {
 			_, err := writer.Write(entry.Content[offset : offset+size])
 			if err != nil {
+				stats.FilerRequestCounter.WithLabelValues("write.entry.failed").Inc()
 				glog.Errorf("failed to write entry content: %v", err)
 			}
 			return err
@@ -173,6 +174,7 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 				Directory: dir,
 				Name:      name,
 			}); err != nil {
+				stats.FilerRequestCounter.WithLabelValues("read.cache.failed").Inc()
 				glog.Errorf("CacheRemoteObjectToLocalCluster %s: %v", entry.FullPath, err)
 				return fmt.Errorf("cache %s: %v", entry.FullPath, err)
 			} else {
@@ -182,6 +184,7 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 
 		err = filer.StreamContent(fs.filer.MasterClient, writer, chunks, offset, size)
 		if err != nil {
+			stats.FilerRequestCounter.WithLabelValues("read.stream.failed").Inc()
 			glog.Errorf("failed to stream content %s: %v", r.URL, err)
 		}
 		return err
diff --git a/weed/storage/needle/needle_read_write.go b/weed/storage/needle/needle_read_write.go
index 4f9e7f661..7557702e1 100644
--- a/weed/storage/needle/needle_read_write.go
+++ b/weed/storage/needle/needle_read_write.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -217,9 +218,11 @@ func (n *Needle) ReadBytes(bytes []byte, offset int64, size Size, version Versio
 	if n.Size != size {
 		// cookie is not always passed in for this API. Use size to do preliminary checking.
 		if OffsetSize == 4 && offset < int64(MaxPossibleVolumeSize) {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorSizeMismatchOffsetSize").Inc()
 			glog.Errorf("entry not found1: offset %d found id %x size %d, expected size %d", offset, n.Id, n.Size, size)
 			return ErrorSizeMismatch
 		}
+		stats.VolumeServerRequestCounter.WithLabelValues("errorSizeMismatch").Inc()
 		return fmt.Errorf("entry not found: offset %d found id %x size %d, expected size %d", offset, n.Id, n.Size, size)
 	}
 	switch version {
@@ -235,6 +238,7 @@ func (n *Needle) ReadBytes(bytes []byte, offset int64, size Size, version Versio
 		checksum := util.BytesToUint32(bytes[NeedleHeaderSize+size : NeedleHeaderSize+size+NeedleChecksumSize])
 		newChecksum := NewCRC(n.Data)
 		if checksum != newChecksum.Value() {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorCRC").Inc()
 			return errors.New("CRC error! Data On Disk Corrupted")
 		}
 		n.Checksum = newChecksum
@@ -267,6 +271,7 @@ func (n *Needle) readNeedleDataVersion2(bytes []byte) (err error) {
 		n.DataSize = util.BytesToUint32(bytes[index : index+4])
 		index = index + 4
 		if int(n.DataSize)+index > lenBytes {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorIndexOutOfRange").Inc()
 			return fmt.Errorf("index out of range %d", 1)
 		}
 		n.Data = bytes[index : index+int(n.DataSize)]
@@ -278,6 +283,7 @@ func (n *Needle) readNeedleDataVersion2(bytes []byte) (err error) {
 		n.NameSize = uint8(bytes[index])
 		index = index + 1
 		if int(n.NameSize)+index > lenBytes {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorIndexOutOfRange").Inc()
 			return fmt.Errorf("index out of range %d", 2)
 		}
 		n.Name = bytes[index : index+int(n.NameSize)]
@@ -287,6 +293,7 @@ func (n *Needle) readNeedleDataVersion2(bytes []byte) (err error) {
 		n.MimeSize = uint8(bytes[index])
 		index = index + 1
 		if int(n.MimeSize)+index > lenBytes {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorIndexOutOfRange").Inc()
 			return fmt.Errorf("index out of range %d", 3)
 		}
 		n.Mime = bytes[index : index+int(n.MimeSize)]
@@ -294,6 +301,7 @@ func (n *Needle) readNeedleDataVersion2(bytes []byte) (err error) {
 	}
 	if index < lenBytes && n.HasLastModifiedDate() {
 		if LastModifiedBytesLength+index > lenBytes {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorIndexOutOfRange").Inc()
 			return fmt.Errorf("index out of range %d", 4)
 		}
 		n.LastModified = util.BytesToUint64(bytes[index : index+LastModifiedBytesLength])
@@ -301,6 +309,7 @@ func (n *Needle) readNeedleDataVersion2(bytes []byte) (err error) {
 	}
 	if index < lenBytes && n.HasTtl() {
 		if TtlBytesLength+index > lenBytes {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorIndexOutOfRange").Inc()
 			return fmt.Errorf("index out of range %d", 5)
 		}
 		n.Ttl = LoadTTLFromBytes(bytes[index : index+TtlBytesLength])
@@ -308,11 +317,13 @@ func (n *Needle) readNeedleDataVersion2(bytes []byte) (err error) {
 	}
 	if index < lenBytes && n.HasPairs() {
 		if 2+index > lenBytes {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorIndexOutOfRange").Inc()
 			return fmt.Errorf("index out of range %d", 6)
 		}
 		n.PairsSize = util.BytesToUint16(bytes[index : index+2])
 		index += 2
 		if int(n.PairsSize)+index > lenBytes {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorIndexOutOfRange").Inc()
 			return fmt.Errorf("index out of range %d", 7)
 		}
 		end := index + int(n.PairsSize)
diff --git a/weed/topology/store_replicate.go b/weed/topology/store_replicate.go
index 85c3a48ab..0efbf9ab5 100644
--- a/weed/topology/store_replicate.go
+++ b/weed/topology/store_replicate.go
@@ -13,6 +13,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
@@ -44,6 +45,7 @@ func ReplicatedWrite(masterFn operation.GetMasterFn, grpcDialOption grpc.DialOpt
 	if s.GetVolume(volumeId) != nil {
 		isUnchanged, err = s.WriteVolumeNeedle(volumeId, n, true, fsync)
 		if err != nil {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorWriteToLocalDisk").Inc()
 			err = fmt.Errorf("failed to write to local disk: %v", err)
 			glog.V(0).Infoln(err)
 			return
@@ -74,6 +76,7 @@ func ReplicatedWrite(masterFn operation.GetMasterFn, grpcDialOption grpc.DialOpt
 				tmpMap := make(map[string]string)
 				err := json.Unmarshal(n.Pairs, &tmpMap)
 				if err != nil {
+					stats.VolumeServerRequestCounter.WithLabelValues("errorUnmarshalPairs").Inc()
 					glog.V(0).Infoln("Unmarshal pairs error:", err)
 				}
 				for k, v := range tmpMap {
@@ -95,6 +98,7 @@ func ReplicatedWrite(masterFn operation.GetMasterFn, grpcDialOption grpc.DialOpt
 			_, err := operation.UploadData(n.Data, uploadOption)
 			return err
 		}); err != nil {
+			stats.VolumeServerRequestCounter.WithLabelValues("errorWriteToReplicas").Inc()
 			err = fmt.Errorf("failed to write to replicas for volume %d: %v", volumeId, err)
 			glog.V(0).Infoln(err)
 		}