diff --git a/go/glog/convenient_api.go b/go/glog/convenient_api.go
new file mode 100644
index 000000000..b209c0b5c
--- /dev/null
+++ b/go/glog/convenient_api.go
@@ -0,0 +1,17 @@
+package glog
+
+import ()
+
+/*
+Copying the original glog because it is missing several convenient methods.
+1. change log file size limit to 180MB
+2. use ToStderrAndLog() in the weed.go
+3. remove nano time in log format
+*/
+
+func ToStderr() {
+	logging.toStderr = true
+}
+func ToStderrAndLog() {
+  logging.alsoToStderr = true
+}
diff --git a/go/glog/glog.go b/go/glog/glog.go
index 59478c5ec..28af70191 100644
--- a/go/glog/glog.go
+++ b/go/glog/glog.go
@@ -557,8 +557,8 @@ func (l *loggingT) header(s severity) *buffer {
 	buf.twoDigits(9, minute)
 	buf.tmp[11] = ':'
 	buf.twoDigits(12, second)
-	buf.tmp[14] = '.'
-	buf.nDigits(6, 15, now.Nanosecond()/1000)
+	//buf.tmp[14] = '.'
+	//buf.nDigits(6, 15, now.Nanosecond()/1000)
 	buf.tmp[21] = ' '
 	buf.nDigits(5, 22, pid) // TODO: should be TID
 	buf.tmp[27] = ' '
@@ -798,7 +798,7 @@ func (sb *syncBuffer) rotateFile(now time.Time) error {
 	fmt.Fprintf(&buf, "Log file created at: %s\n", now.Format("2006/01/02 15:04:05"))
 	fmt.Fprintf(&buf, "Running on machine: %s\n", host)
 	fmt.Fprintf(&buf, "Binary: Built with %s %s for %s/%s\n", runtime.Compiler, runtime.Version(), runtime.GOOS, runtime.GOARCH)
-	fmt.Fprintf(&buf, "Log line format: [IWEF]mmdd hh:mm:ss.uuuuuu threadid file:line] msg\n")
+	fmt.Fprintf(&buf, "Log line format: [IWEF]mmdd hh:mm:ss threadid file:line] msg\n")
 	n, err := sb.file.Write(buf.Bytes())
 	sb.nbytes += uint64(n)
 	return err
diff --git a/go/glog/glog_file.go b/go/glog/glog_file.go
index 8dcb2bc08..8c744bc51 100644
--- a/go/glog/glog_file.go
+++ b/go/glog/glog_file.go
@@ -31,7 +31,7 @@ import (
 )
 
 // MaxSize is the maximum size of a log file in bytes.
-var MaxSize uint64 = 1024 * 1024 * 1800
+var MaxSize uint64 = 1024 * 1024 * 180
 
 // logDirs lists the candidate directories for new log files.
 var logDirs []string
diff --git a/go/operation/delete_content.go b/go/operation/delete_content.go
index 2bdb49651..12f3ca4e8 100644
--- a/go/operation/delete_content.go
+++ b/go/operation/delete_content.go
@@ -1,14 +1,14 @@
 package operation
 
 import (
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"net/http"
 )
 
 func Delete(url string) error {
 	req, err := http.NewRequest("DELETE", url, nil)
 	if err != nil {
-		log.Println("failing to delete", url)
+		glog.V(0).Infoln("failing to delete", url)
 		return err
 	}
 	_, err = http.DefaultClient.Do(req)
diff --git a/go/operation/upload_content.go b/go/operation/upload_content.go
index c452ef1dc..cb5ebc399 100644
--- a/go/operation/upload_content.go
+++ b/go/operation/upload_content.go
@@ -7,7 +7,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"mime"
 	"mime/multipart"
 	"net/http"
@@ -37,21 +37,21 @@ func Upload(uploadUrl string, filename string, reader io.Reader, isGzipped bool,
 	}
 	file_writer, err := body_writer.CreatePart(h)
 	if err != nil {
-		log.Println("error creating form file", err)
+		glog.V(0).Infoln("error creating form file", err)
 		return nil, err
 	}
 	if _, err = io.Copy(file_writer, reader); err != nil {
-		log.Println("error copying data", err)
+		glog.V(0).Infoln("error copying data", err)
 		return nil, err
 	}
 	content_type := body_writer.FormDataContentType()
 	if err = body_writer.Close(); err != nil {
-		log.Println("error closing body", err)
+		glog.V(0).Infoln("error closing body", err)
 		return nil, err
 	}
 	resp, err := http.Post(uploadUrl, content_type, body_buf)
 	if err != nil {
-		log.Println("failing to upload to", uploadUrl)
+		glog.V(0).Infoln("failing to upload to", uploadUrl)
 		return nil, err
 	}
 	defer resp.Body.Close()
@@ -62,7 +62,7 @@ func Upload(uploadUrl string, filename string, reader io.Reader, isGzipped bool,
 	var ret UploadResult
 	err = json.Unmarshal(resp_body, &ret)
 	if err != nil {
-		log.Println("failing to read upload resonse", uploadUrl, resp_body)
+		glog.V(0).Infoln("failing to read upload resonse", uploadUrl, resp_body)
 		return nil, err
 	}
 	if ret.Error != "" {
diff --git a/go/replication/store_replicate.go b/go/replication/store_replicate.go
index bdc13ee3b..de2f3fcd8 100644
--- a/go/replication/store_replicate.go
+++ b/go/replication/store_replicate.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"code.google.com/p/weed-fs/go/operation"
 	"code.google.com/p/weed-fs/go/storage"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"net/http"
 	"strconv"
 )
@@ -50,7 +50,7 @@ func ReplicatedWrite(masterNode string, s *storage.Store, volumeId storage.Volum
 func ReplicatedDelete(masterNode string, store *storage.Store, volumeId storage.VolumeId, n *storage.Needle, r *http.Request) (ret uint32) {
 	ret, err := store.Delete(volumeId, n)
 	if err != nil {
-		log.Println("delete error:", err)
+		glog.V(0).Infoln("delete error:", err)
 		return
 	}
 
@@ -89,7 +89,7 @@ func distributedOperation(masterNode string, store *storage.Store, volumeId stor
 		}
 		return ret
 	} else {
-		log.Println("Failed to lookup for", volumeId, lookupErr.Error())
+		glog.V(0).Infoln("Failed to lookup for", volumeId, lookupErr.Error())
 	}
 	return false
 }
diff --git a/go/replication/volume_growth.go b/go/replication/volume_growth.go
index d5950790d..759eb19a7 100644
--- a/go/replication/volume_growth.go
+++ b/go/replication/volume_growth.go
@@ -6,7 +6,7 @@ import (
 	"code.google.com/p/weed-fs/go/topology"
 	"errors"
 	"fmt"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"math/rand"
 	"sync"
 )
@@ -204,9 +204,9 @@ func (vg *VolumeGrowth) grow(topo *topology.Topology, vid storage.VolumeId, repT
 			vi := storage.VolumeInfo{Id: vid, Size: 0, RepType: repType, Version: storage.CurrentVersion}
 			server.AddOrUpdateVolume(vi)
 			topo.RegisterVolumeLayout(&vi, server)
-			log.Println("Created Volume", vid, "on", server)
+			glog.V(0).Infoln("Created Volume", vid, "on", server)
 		} else {
-			log.Println("Failed to assign", vid, "to", servers, "error", err)
+			glog.V(0).Infoln("Failed to assign", vid, "to", servers, "error", err)
 			return errors.New("Failed to assign " + vid.String())
 		}
 	}
diff --git a/go/sequence/sequence.go b/go/sequence/sequence.go
index 3130740f1..658996153 100644
--- a/go/sequence/sequence.go
+++ b/go/sequence/sequence.go
@@ -2,7 +2,7 @@ package sequence
 
 import (
 	"encoding/gob"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"os"
 	"path"
 	"sync"
@@ -32,16 +32,16 @@ func NewSequencer(dirname string, filename string) (m *SequencerImpl) {
 	seqFile, se := os.OpenFile(path.Join(m.dir, m.fileName+".seq"), os.O_RDONLY, 0644)
 	if se != nil {
 		m.FileIdSequence = FileIdSaveInterval
-		log.Println("Setting file id sequence", m.FileIdSequence)
+		glog.V(0).Infoln("Setting file id sequence", m.FileIdSequence)
 	} else {
 		decoder := gob.NewDecoder(seqFile)
 		defer seqFile.Close()
 		if se = decoder.Decode(&m.FileIdSequence); se != nil {
-			log.Printf("error decoding FileIdSequence: %s", se)
+			glog.V(0).Infof("error decoding FileIdSequence: %s", se)
 			m.FileIdSequence = FileIdSaveInterval
-			log.Println("Setting file id sequence", m.FileIdSequence)
+			glog.V(0).Infoln("Setting file id sequence", m.FileIdSequence)
 		} else {
-			log.Println("Loading file id sequence", m.FileIdSequence, "=>", m.FileIdSequence+FileIdSaveInterval)
+			glog.V(0).Infoln("Loading file id sequence", m.FileIdSequence, "=>", m.FileIdSequence+FileIdSaveInterval)
 			m.FileIdSequence += FileIdSaveInterval
 		}
 		//in case the server stops between intervals
@@ -65,14 +65,14 @@ func (m *SequencerImpl) NextFileId(count int) (uint64, int) {
 	return m.FileIdSequence - m.fileIdCounter - uint64(count), count
 }
 func (m *SequencerImpl) saveSequence() {
-	log.Println("Saving file id sequence", m.FileIdSequence, "to", path.Join(m.dir, m.fileName+".seq"))
+	glog.V(0).Infoln("Saving file id sequence", m.FileIdSequence, "to", path.Join(m.dir, m.fileName+".seq"))
 	seqFile, e := os.OpenFile(path.Join(m.dir, m.fileName+".seq"), os.O_CREATE|os.O_WRONLY, 0644)
 	if e != nil {
-		log.Fatalf("Sequence File Save [ERROR] %s\n", e)
+		glog.Fatalf("Sequence File Save [ERROR] %s", e)
 	}
 	defer seqFile.Close()
 	encoder := gob.NewEncoder(seqFile)
 	if e = encoder.Encode(m.FileIdSequence); e != nil {
-		log.Fatalf("Sequence File Save [ERROR] %s\n", e)
+		glog.Fatalf("Sequence File Save [ERROR] %s", e)
 	}
 }
diff --git a/go/storage/cdb_map_test.go b/go/storage/cdb_map_test.go
index e932a7ec5..6fe2a12f0 100644
--- a/go/storage/cdb_map_test.go
+++ b/go/storage/cdb_map_test.go
@@ -1,7 +1,7 @@
 package storage
 
 import (
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"math/rand"
 	"os"
 	"runtime"
@@ -39,7 +39,7 @@ func TestCdbMap1Mem(t *testing.T) {
 		t.Fatalf("error opening cdb: %s", err)
 	}
 	b := getMemStats()
-	log.Printf("opening cdb consumed %d bytes", b-a)
+	glog.V(0).Infof("opening cdb consumed %d bytes", b-a)
 	defer nm.Close()
 
 	a = getMemStats()
@@ -47,7 +47,7 @@ func TestCdbMap1Mem(t *testing.T) {
 		t.Fatalf("error visiting %s: %s", nm, err)
 	}
 	b = getMemStats()
-	log.Printf("visit cdb %d consumed %d bytes", i, b-a)
+	glog.V(0).Infof("visit cdb %d consumed %d bytes", i, b-a)
 	nm.Close()
 
 	indexFile, err := os.Open(testIndexFilename)
@@ -61,7 +61,7 @@ func TestCdbMap1Mem(t *testing.T) {
 	}
 	defer nm.Close()
 	b = getMemStats()
-	log.Printf("opening idx consumed %d bytes", b-a)
+	glog.V(0).Infof("opening idx consumed %d bytes", b-a)
 
 	i = 0
 	a = getMemStats()
@@ -69,7 +69,7 @@ func TestCdbMap1Mem(t *testing.T) {
 		t.Fatalf("error visiting %s: %s", nm, err)
 	}
 	b = getMemStats()
-	log.Printf("visit idx %d consumed %d bytes", i, b-a)
+	glog.V(0).Infof("visit idx %d consumed %d bytes", i, b-a)
 }
 
 func BenchmarkCdbMap9List(t *testing.B) {
@@ -88,7 +88,7 @@ func BenchmarkCdbMap9List(t *testing.B) {
 	}
 	defer idx.Close()
 	b := getMemStats()
-	log.Printf("LoadNeedleMap consumed %d bytes", b-a)
+	glog.V(0).Infof("LoadNeedleMap consumed %d bytes", b-a)
 
 	cdbFn := testIndexFilename + ".cdb"
 	a = getMemStats()
@@ -99,10 +99,10 @@ func BenchmarkCdbMap9List(t *testing.B) {
 	}
 	defer m.Close()
 	b = getMemStats()
-	log.Printf("OpenCdbMap consumed %d bytes", b-a)
+	glog.V(0).Infof("OpenCdbMap consumed %d bytes", b-a)
 
 	i := 0
-	log.Printf("checking whether the cdb contains every key")
+	glog.V(0).Infoln("checking whether the cdb contains every key")
 	t.StartTimer()
 	err = idx.Visit(func(nv NeedleValue) error {
 		if i > t.N || rand.Intn(10) < 9 {
@@ -110,7 +110,7 @@ func BenchmarkCdbMap9List(t *testing.B) {
 		}
 		i++
 		if i%1000 == 0 {
-			log.Printf("%d. %s", i, nv)
+			glog.V(0).Infof("%d. %s", i, nv)
 		}
 		if nv2, ok := m.Get(uint64(nv.Key)); !ok || nv2 == nil {
 			t.Errorf("%s in index, not in cdb", nv.Key)
@@ -130,7 +130,7 @@ func BenchmarkCdbMap9List(t *testing.B) {
 	}
 
 	i = 0
-	log.Printf("checking wheter the cdb contains no stray keys")
+	glog.V(0).Infoln("checking wheter the cdb contains no stray keys")
 	t.StartTimer()
 	err = m.Visit(func(nv NeedleValue) error {
 		if i > t.N || rand.Intn(10) < 9 {
@@ -147,7 +147,7 @@ func BenchmarkCdbMap9List(t *testing.B) {
 		}
 		i++
 		if i%1000 == 0 {
-			log.Printf("%d. %s", i, nv)
+			glog.V(0).Infof("%d. %s", i, nv)
 		}
 		t.SetBytes(int64(nv.Size))
 		return nil
diff --git a/go/storage/compact_map.go b/go/storage/compact_map.go
index 65fdf0e95..b96475860 100644
--- a/go/storage/compact_map.go
+++ b/go/storage/compact_map.go
@@ -38,13 +38,13 @@ func (cs *CompactSection) Set(key Key, offset uint32, size uint32) uint32 {
 	}
 	if i := cs.binarySearchValues(key); i >= 0 {
 		ret = cs.values[i].Size
-		//println("key", key, "old size", ret)
+		//glog.V(4).Infoln("key", key, "old size", ret)
 		cs.values[i].Offset, cs.values[i].Size = offset, size
 	} else {
 		needOverflow := cs.counter >= batch
 		needOverflow = needOverflow || cs.counter > 0 && cs.values[cs.counter-1].Key > key
 		if needOverflow {
-			//println("start", cs.start, "counter", cs.counter, "key", key)
+			//glog.V(4).Infoln("start", cs.start, "counter", cs.counter, "key", key)
 			if oldValue, found := cs.overflow[key]; found {
 				ret = oldValue.Size
 			}
@@ -52,7 +52,7 @@ func (cs *CompactSection) Set(key Key, offset uint32, size uint32) uint32 {
 		} else {
 			p := &cs.values[cs.counter]
 			p.Key, p.Offset, p.Size = key, offset, size
-			//println("added index", cs.counter, "key", key, cs.values[cs.counter].Key)
+			//glog.V(4).Infoln("added index", cs.counter, "key", key, cs.values[cs.counter].Key)
 			cs.counter++
 		}
 	}
@@ -88,16 +88,16 @@ func (cs *CompactSection) binarySearchValues(key Key) int {
 	if h >= 0 && cs.values[h].Key < key {
 		return -2
 	}
-	//println("looking for key", key)
+	//glog.V(4).Infoln("looking for key", key)
 	for l <= h {
 		m := (l + h) / 2
-		//println("mid", m, "key", cs.values[m].Key, cs.values[m].Offset, cs.values[m].Size)
+		//glog.V(4).Infoln("mid", m, "key", cs.values[m].Key, cs.values[m].Offset, cs.values[m].Size)
 		if cs.values[m].Key < key {
 			l = m + 1
 		} else if key < cs.values[m].Key {
 			h = m - 1
 		} else {
-			//println("found", m)
+			//glog.V(4).Infoln("found", m)
 			return m
 		}
 	}
@@ -116,7 +116,7 @@ func NewCompactMap() CompactMap {
 func (cm *CompactMap) Set(key Key, offset uint32, size uint32) uint32 {
 	x := cm.binarySearchCompactSection(key)
 	if x < 0 {
-		//println(x, "creating", len(cm.list), "section1, starting", key)
+		//glog.V(4).Infoln(x, "creating", len(cm.list), "section1, starting", key)
 		cm.list = append(cm.list, NewCompactSection(key))
 		x = len(cm.list) - 1
 	}
diff --git a/go/storage/compact_map_perf_test.go b/go/storage/compact_map_perf_test.go
index b885ebd93..d97e7a66b 100644
--- a/go/storage/compact_map_perf_test.go
+++ b/go/storage/compact_map_perf_test.go
@@ -2,7 +2,7 @@ package storage
 
 import (
 	"code.google.com/p/weed-fs/go/util"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"os"
 	"testing"
 )
@@ -23,7 +23,7 @@ func LoadNewNeedleMap(file *os.File) CompactMap {
 	count, e := file.Read(bytes)
 	if count > 0 {
 		fstat, _ := file.Stat()
-		log.Println("Loading index file", fstat.Name(), "size", fstat.Size())
+		glog.V(0).Infoln("Loading index file", fstat.Name(), "size", fstat.Size())
 	}
 	for count > 0 && e == nil {
 		for i := 0; i < count; i += 16 {
diff --git a/go/storage/compact_map_test.go b/go/storage/compact_map_test.go
index e76e9578d..2f8d17635 100644
--- a/go/storage/compact_map_test.go
+++ b/go/storage/compact_map_test.go
@@ -20,7 +20,7 @@ func TestXYZ(t *testing.T) {
 
 	//	for i := uint32(0); i < 100; i++ {
 	//		if v := m.Get(Key(i)); v != nil {
-	//			println(i, "=", v.Key, v.Offset, v.Size)
+	//			glog.V(4).Infoln(i, "=", v.Key, v.Offset, v.Size)
 	//		}
 	//	}
 
diff --git a/go/storage/compress.go b/go/storage/compress.go
index e8816422b..add66792a 100644
--- a/go/storage/compress.go
+++ b/go/storage/compress.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"compress/flate"
 	"compress/gzip"
+	"code.google.com/p/weed-fs/go/glog"
 	"io/ioutil"
 	"strings"
 )
@@ -36,11 +37,11 @@ func GzipData(input []byte) ([]byte, error) {
 	buf := new(bytes.Buffer)
 	w, _ := gzip.NewWriterLevel(buf, flate.BestCompression)
 	if _, err := w.Write(input); err != nil {
-		println("error compressing data:", err)
+		glog.V(4).Infoln("error compressing data:", err)
 		return nil, err
 	}
 	if err := w.Close(); err != nil {
-		println("error closing compressed data:", err)
+		glog.V(4).Infoln("error closing compressed data:", err)
 		return nil, err
 	}
 	return buf.Bytes(), nil
@@ -51,7 +52,7 @@ func UnGzipData(input []byte) ([]byte, error) {
 	defer r.Close()
 	output, err := ioutil.ReadAll(r)
 	if err != nil {
-		println("error uncompressing data:", err)
+		glog.V(4).Infoln("error uncompressing data:", err)
 	}
 	return output, err
 }
diff --git a/go/storage/file_id.go b/go/storage/file_id.go
index 0fdee9f13..20d508a8b 100644
--- a/go/storage/file_id.go
+++ b/go/storage/file_id.go
@@ -4,6 +4,7 @@ import (
 	"code.google.com/p/weed-fs/go/util"
 	"encoding/hex"
 	"strings"
+  "code.google.com/p/weed-fs/go/glog"
 )
 
 type FileId struct {
@@ -18,7 +19,7 @@ func NewFileId(VolumeId VolumeId, Key uint64, Hashcode uint32) *FileId {
 func ParseFileId(fid string) *FileId {
 	a := strings.Split(fid, ",")
 	if len(a) != 2 {
-		println("Invalid fid", fid, ", split length", len(a))
+		glog.V(4).Infoln("Invalid fid", fid, ", split length", len(a))
 		return nil
 	}
 	vid_string, key_hash_string := a[0], a[1]
diff --git a/go/storage/needle.go b/go/storage/needle.go
index b403d16bf..083ce6d5f 100644
--- a/go/storage/needle.go
+++ b/go/storage/needle.go
@@ -5,7 +5,7 @@ import (
 	"encoding/hex"
 	"errors"
 	"io/ioutil"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"mime"
 	"net/http"
 	"path"
@@ -41,13 +41,13 @@ type Needle struct {
 func ParseUpload(r *http.Request) (fileName string, data []byte, mimeType string, isGzipped bool, modifiedTime uint64, e error) {
 	form, fe := r.MultipartReader()
 	if fe != nil {
-		log.Println("MultipartReader [ERROR]", fe)
+		glog.V(0).Infoln("MultipartReader [ERROR]", fe)
 		e = fe
 		return
 	}
 	part, fe := form.NextPart()
 	if fe != nil {
-		log.Println("Reading Multi part [ERROR]", fe)
+		glog.V(0).Infoln("Reading Multi part [ERROR]", fe)
 		e = fe
 		return
 	}
@@ -60,7 +60,7 @@ func ParseUpload(r *http.Request) (fileName string, data []byte, mimeType string
 	}
 	data, e = ioutil.ReadAll(part)
 	if e != nil {
-		log.Println("Reading Content [ERROR]", e)
+		glog.V(0).Infoln("Reading Content [ERROR]", e)
 		return
 	}
 	dotIndex := strings.LastIndex(fileName, ".")
@@ -131,7 +131,7 @@ func (n *Needle) ParsePath(fid string) {
 	length := len(fid)
 	if length <= 8 {
 		if length > 0 {
-			log.Println("Invalid fid", fid, "length", length)
+			glog.V(0).Infoln("Invalid fid", fid, "length", length)
 		}
 		return
 	}
@@ -153,7 +153,7 @@ func ParseKeyHash(key_hash_string string) (uint64, uint32) {
 	key_hash_bytes, khe := hex.DecodeString(key_hash_string)
 	key_hash_len := len(key_hash_bytes)
 	if khe != nil || key_hash_len <= 4 {
-		log.Println("Invalid key_hash", key_hash_string, "length:", key_hash_len, "error", khe)
+		glog.V(0).Infoln("Invalid key_hash", key_hash_string, "length:", key_hash_len, "error", khe)
 		return 0, 0
 	}
 	key := util.BytesToUint64(key_hash_bytes[0 : key_hash_len-4])
diff --git a/go/storage/needle_map.go b/go/storage/needle_map.go
index 89773b341..a242cd673 100644
--- a/go/storage/needle_map.go
+++ b/go/storage/needle_map.go
@@ -57,14 +57,14 @@ func LoadNeedleMap(file *os.File) (*NeedleMap, error) {
 		nm.FileByteCounter = nm.FileByteCounter + uint64(size)
 		if offset > 0 {
 			oldSize := nm.m.Set(Key(key), offset, size)
-			//log.Println("reading key", key, "offset", offset, "size", size, "oldSize", oldSize)
+			//glog.V(0).Infoln("reading key", key, "offset", offset, "size", size, "oldSize", oldSize)
 			if oldSize > 0 {
 				nm.DeletionCounter++
 				nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize)
 			}
 		} else {
 			oldSize := nm.m.Delete(Key(key))
-			//log.Println("removing key", key, "offset", offset, "size", size, "oldSize", oldSize)
+			//glog.V(0).Infoln("removing key", key, "offset", offset, "size", size, "oldSize", oldSize)
 			nm.DeletionCounter++
 			nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize)
 		}
diff --git a/go/storage/needle_read_write.go b/go/storage/needle_read_write.go
index 5c72c5edb..0b833c0a9 100644
--- a/go/storage/needle_read_write.go
+++ b/go/storage/needle_read_write.go
@@ -5,7 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"os"
 )
 
@@ -27,12 +27,12 @@ func (n *Needle) Append(w io.Writer, version Version) (size uint32, err error) {
 			defer func(s io.Seeker, off int64) {
 				if err != nil {
 					if _, e = s.Seek(off, 0); e != nil {
-						log.Printf("Failed to seek %s back to %d with error: %s\n", w, off, e)
+						glog.V(0).Infof("Failed to seek %s back to %d with error: %s", w, off, e.Error())
 					}
 				}
 			}(s, end)
 		} else {
-			err = fmt.Errorf("Cnnot Read Current Volume Position: %s", e)
+			err = fmt.Errorf("Cnnot Read Current Volume Position: %s", e.Error())
 			return
 		}
 	}
diff --git a/go/storage/store.go b/go/storage/store.go
index a96602ed0..143d2b706 100644
--- a/go/storage/store.go
+++ b/go/storage/store.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"net/url"
 	"strconv"
 	"strings"
@@ -95,7 +95,7 @@ func (s *Store) addVolume(vid VolumeId, replicationType ReplicationType) error {
 		return fmt.Errorf("Volume Id %s already exists!", vid)
 	}
 	if location := s.findFreeLocation(); location != nil {
-		log.Println("In dir", location.directory, "adds volume =", vid, ", replicationType =", replicationType)
+		glog.V(0).Infoln("In dir", location.directory, "adds volume =", vid, ", replicationType =", replicationType)
 		if volume, err := NewVolume(location.directory, vid, replicationType); err == nil {
       location.volumes[vid] = volume
       return nil
@@ -163,14 +163,14 @@ func (l *DiskLocation) loadExistingVolumes() {
 					if l.volumes[vid] == nil {
 						if v, e := NewVolume(l.directory, vid, CopyNil); e == nil {
 							l.volumes[vid] = v
-							log.Println("In dir", l.directory, "read volume =", vid, "replicationType =", v.ReplicaType, "version =", v.Version(), "size =", v.Size())
+							glog.V(0).Infoln("In dir", l.directory, "read volume =", vid, "replicationType =", v.ReplicaType, "version =", v.Version(), "size =", v.Size())
 						}
 					}
 				}
 			}
 		}
 	}
-	log.Println("Store started on dir:", l.directory, "with", len(l.volumes), "volumes", "max", l.maxVolumeCount)
+	glog.V(0).Infoln("Store started on dir:", l.directory, "with", len(l.volumes), "volumes", "max", l.maxVolumeCount)
 }
 func (s *Store) Status() []*VolumeInfo {
 	var stats []*VolumeInfo
@@ -259,15 +259,15 @@ func (s *Store) Write(i VolumeId, n *Needle) (size uint32, err error) {
 				err = fmt.Errorf("Volume Size Limit %d Exceeded! Current size is %d", s.volumeSizeLimit, v.ContentSize())
 			}
 			if err != nil && s.volumeSizeLimit < v.ContentSize()+uint64(size) && s.volumeSizeLimit >= v.ContentSize() {
-				log.Println("volume", i, "size is", v.ContentSize(), "close to", s.volumeSizeLimit)
+				glog.V(0).Infoln("volume", i, "size is", v.ContentSize(), "close to", s.volumeSizeLimit)
 				if err = s.Join(); err != nil {
-					log.Printf("error with Join: %s", err)
+					glog.V(0).Infoln("error with Join:", err)
 				}
 			}
 		}
 		return
 	}
-	log.Println("volume", i, "not found!")
+	glog.V(0).Infoln("volume", i, "not found!")
 	err = fmt.Errorf("Volume %s not found!", i)
 	return
 }
diff --git a/go/storage/volume.go b/go/storage/volume.go
index 01d37285d..c212e9b37 100644
--- a/go/storage/volume.go
+++ b/go/storage/volume.go
@@ -2,10 +2,10 @@ package storage
 
 import (
 	"bytes"
+	"code.google.com/p/weed-fs/go/glog"
 	"errors"
 	"fmt"
 	"io"
-	"log"
 	"os"
 	"path"
 	"sync"
@@ -45,7 +45,7 @@ func NewVolume(dirname string, id VolumeId, replicationType ReplicationType) (v
 	e = v.load(true)
 	return
 }
-func LoadVolumeOnly(dirname string, id VolumeId) (v *Volume, e error) {
+func loadVolumeWithoutIndex(dirname string, id VolumeId) (v *Volume, e error) {
 	v = &Volume{dir: dirname, Id: id}
 	v.SuperBlock = SuperBlock{ReplicaType: CopyNil}
 	e = v.load(false)
@@ -57,12 +57,12 @@ func (v *Volume) load(alsoLoadIndex bool) error {
 	v.dataFile, e = os.OpenFile(fileName+".dat", os.O_RDWR|os.O_CREATE, 0644)
 	if e != nil {
 		if !os.IsPermission(e) {
-			return fmt.Errorf("cannot create Volume Data %s.dat: %s", fileName, e)
+			return fmt.Errorf("cannot create Volume Data %s.dat: %s", fileName, e.Error())
 		}
 		if v.dataFile, e = os.Open(fileName + ".dat"); e != nil {
-			return fmt.Errorf("cannot open Volume Data %s.dat: %s", fileName, e)
+			return fmt.Errorf("cannot open Volume Data %s.dat: %s", fileName, e.Error())
 		}
-		log.Printf("opening " + fileName + ".dat in READONLY mode")
+		glog.V(0).Infoln("opening " + fileName + ".dat in READONLY mode")
 		v.readOnly = true
 	}
 	if v.ReplicaType == CopyNil {
@@ -73,28 +73,40 @@ func (v *Volume) load(alsoLoadIndex bool) error {
 	if e == nil && alsoLoadIndex {
 		var indexFile *os.File
 		if v.readOnly {
+			glog.V(4).Infoln("opening file", fileName+".idx")
 			if indexFile, e = os.Open(fileName + ".idx"); e != nil && !os.IsNotExist(e) {
-				return fmt.Errorf("cannot open index file %s.idx: %s", fileName, e)
+				return fmt.Errorf("cannot open index file %s.idx: %s", fileName, e.Error())
 			}
 			if indexFile != nil {
-				log.Printf("converting %s.idx to %s.cdb", fileName, fileName)
-				if e = ConvertIndexToCdb(fileName+".cdb", indexFile); e != nil {
-					log.Printf("error converting %s.idx to %s.cdb: %s", fileName, fileName)
-				} else {
-					indexFile.Close()
-					os.Remove(indexFile.Name())
-					indexFile = nil
+				glog.V(4).Infoln("check file", fileName+".cdb")
+				if _, err := os.Stat(fileName + ".cdb"); os.IsNotExist(err) {
+					glog.V(0).Infof("converting %s.idx to %s.cdb", fileName, fileName)
+					if e = ConvertIndexToCdb(fileName+".cdb", indexFile); e != nil {
+						glog.V(0).Infof("error converting %s.idx to %s.cdb: %s", fileName, e.Error())
+					} else {
+						indexFile.Close()
+						indexFile = nil
+					}
 				}
 			}
-			v.nm, e = OpenCdbMap(fileName + ".cdb")
-			return e
-		} else {
-			indexFile, e = os.OpenFile(fileName+".idx", os.O_RDWR|os.O_CREATE, 0644)
-			if e != nil {
-				return fmt.Errorf("cannot create Volume Data %s.dat: %s", fileName, e)
+			glog.V(4).Infoln("open file", fileName+".cdb")
+			if v.nm, e = OpenCdbMap(fileName + ".cdb"); e != nil {
+				if os.IsNotExist(e) {
+					glog.V(0).Infof("Failed to read cdb file :%s, fall back to normal readonly mode.", fileName)
+				} else {
+					glog.V(0).Infof("%s.cdb open errro:%s", fileName, e.Error())
+					return e
+				}
 			}
 		}
+		glog.V(4).Infoln("open to write file", fileName+".idx")
+		indexFile, e = os.OpenFile(fileName+".idx", os.O_RDWR|os.O_CREATE, 0644)
+		if e != nil {
+			return fmt.Errorf("cannot create Volume Data %s.dat: %s", fileName, e.Error())
+		}
+		glog.V(4).Infoln("loading file", fileName+".idx")
 		v.nm, e = LoadNeedleMap(indexFile)
+		glog.V(4).Infoln("loading error:", e)
 	}
 	return e
 }
@@ -108,7 +120,7 @@ func (v *Volume) Size() int64 {
 	if e == nil {
 		return stat.Size()
 	}
-	log.Printf("Failed to read file size %s %s\n", v.dataFile.Name(), e.Error())
+	glog.V(0).Infof("Failed to read file size %s %s", v.dataFile.Name(), e.Error())
 	return -1
 }
 func (v *Volume) Close() {
@@ -120,7 +132,7 @@ func (v *Volume) Close() {
 func (v *Volume) maybeWriteSuperBlock() error {
 	stat, e := v.dataFile.Stat()
 	if e != nil {
-		log.Printf("failed to stat datafile %s: %s", v.dataFile, e)
+		glog.V(0).Infof("failed to stat datafile %s: %s", v.dataFile, e.Error())
 		return e
 	}
 	if stat.Size() == 0 {
@@ -221,10 +233,10 @@ func (v *Volume) delete(n *Needle) (uint32, error) {
 	//fmt.Println("key", n.Id, "volume offset", nv.Offset, "data_size", n.Size, "cached size", nv.Size)
 	if ok {
 		size := nv.Size
-		if err:= v.nm.Delete(n.Id); err != nil {
+		if err := v.nm.Delete(n.Id); err != nil {
 			return size, err
 		}
-		if _, err:= v.dataFile.Seek(0, 2); err != nil {
+		if _, err := v.dataFile.Seek(0, 2); err != nil {
 			return size, err
 		}
 		n.Data = make([]byte, 0)
@@ -286,7 +298,7 @@ func (v *Volume) freeze() error {
 	defer v.accessLock.Unlock()
 	bn, _ := nakeFilename(v.dataFile.Name())
 	cdbFn := bn + ".cdb"
-	log.Printf("converting %s to %s", nm.indexFile.Name(), cdbFn)
+	glog.V(0).Infof("converting %s to %s", nm.indexFile.Name(), cdbFn)
 	err := DumpNeedleMapToCdb(cdbFn, nm)
 	if err != nil {
 		return err
@@ -304,7 +316,7 @@ func ScanVolumeFile(dirname string, id VolumeId,
 	visitSuperBlock func(SuperBlock) error,
 	visitNeedle func(n *Needle, offset uint32) error) (err error) {
 	var v *Volume
-	if v, err = LoadVolumeOnly(dirname, id); err != nil {
+	if v, err = loadVolumeWithoutIndex(dirname, id); err != nil {
 		return
 	}
 	if err = visitSuperBlock(v.SuperBlock); err != nil {
@@ -361,7 +373,7 @@ func (v *Volume) copyDataAndGenerateIndexFile(dstName, idxName string) (err erro
 		return err
 	}, func(n *Needle, offset uint32) error {
 		nv, ok := v.nm.Get(n.Id)
-		//log.Println("file size is", n.Size, "rest", rest)
+		//glog.V(0).Infoln("file size is", n.Size, "rest", rest)
 		if ok && nv.Offset*NeedlePaddingSize == offset {
 			if nv.Size > 0 {
 				if _, err = nm.Put(n.Id, new_offset/NeedlePaddingSize, n.Size); err != nil {
@@ -371,7 +383,7 @@ func (v *Volume) copyDataAndGenerateIndexFile(dstName, idxName string) (err erro
 					return fmt.Errorf("cannot append needle: %s", err)
 				}
 				new_offset += n.DiskSize()
-				//log.Println("saving key", n.Id, "volume offset", old_offset, "=>", new_offset, "data_size", n.Size, "rest", rest)
+				//glog.V(0).Infoln("saving key", n.Id, "volume offset", old_offset, "=>", new_offset, "data_size", n.Size, "rest", rest)
 			}
 		}
 		return nil
diff --git a/go/topology/node.go b/go/topology/node.go
index b2414032b..c8ff55f07 100644
--- a/go/topology/node.go
+++ b/go/topology/node.go
@@ -2,7 +2,7 @@ package topology
 
 import (
 	"code.google.com/p/weed-fs/go/storage"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 )
 
 type NodeId string
@@ -155,7 +155,7 @@ func (n *NodeImpl) LinkChildNode(node Node) {
 		n.UpAdjustVolumeCountDelta(node.GetVolumeCount())
 		n.UpAdjustActiveVolumeCountDelta(node.GetActiveVolumeCount())
 		node.SetParent(n)
-		log.Println(n, "adds child", node.Id())
+		glog.V(0).Infoln(n, "adds child", node.Id())
 	}
 }
 
@@ -167,7 +167,7 @@ func (n *NodeImpl) UnlinkChildNode(nodeId NodeId) {
 		n.UpAdjustVolumeCountDelta(-node.GetVolumeCount())
 		n.UpAdjustActiveVolumeCountDelta(-node.GetActiveVolumeCount())
 		n.UpAdjustMaxVolumeCountDelta(-node.GetMaxVolumeCount())
-		log.Println(n, "removes", node, "volumeCount =", n.activeVolumeCount)
+		glog.V(0).Infoln(n, "removes", node, "volumeCount =", n.activeVolumeCount)
 	}
 }
 
diff --git a/go/topology/node_list.go b/go/topology/node_list.go
index 9dfc5fded..db7685d82 100644
--- a/go/topology/node_list.go
+++ b/go/topology/node_list.go
@@ -2,7 +2,7 @@ package topology
 
 import (
 	"code.google.com/p/weed-fs/go/storage"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"math/rand"
 )
 
@@ -70,7 +70,7 @@ func (nl *NodeList) ReserveOneVolume(randomVolumeIndex int, vid storage.VolumeId
 			randomVolumeIndex -= freeSpace
 		} else {
 			if node.IsDataNode() && node.FreeSpace() > 0 {
-				log.Println("vid =", vid, " assigned to node =", node, ", freeSpace =", node.FreeSpace())
+				glog.V(0).Infoln("vid =", vid, " assigned to node =", node, ", freeSpace =", node.FreeSpace())
 				return true, node.(*DataNode)
 			}
 			children := node.Children()
diff --git a/go/topology/topology.go b/go/topology/topology.go
index b3223c5b4..f70c53ae6 100644
--- a/go/topology/topology.go
+++ b/go/topology/topology.go
@@ -5,7 +5,7 @@ import (
 	"code.google.com/p/weed-fs/go/storage"
 	"errors"
 	"io/ioutil"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"math/rand"
 )
 
@@ -55,7 +55,7 @@ func (t *Topology) loadConfiguration(configurationFile string) error {
 		t.configuration, e = NewConfiguration(b)
 		return e
 	} else {
-		log.Println("Using default configurations.")
+		glog.V(0).Infoln("Using default configurations.")
 	}
 	return nil
 }
@@ -73,7 +73,7 @@ func (t *Topology) Lookup(vid storage.VolumeId) []*DataNode {
 
 func (t *Topology) RandomlyReserveOneVolume(dataCenter string) (bool, *DataNode, *storage.VolumeId) {
 	if t.FreeSpace() <= 0 {
-		log.Println("Topology does not have free space left!")
+		glog.V(0).Infoln("Topology does not have free space left!")
 		return false, nil, nil
 	}
 	vid := t.NextVolumeId()
@@ -102,7 +102,7 @@ func (t *Topology) PickForWrite(repType storage.ReplicationType, count int, data
 func (t *Topology) GetVolumeLayout(repType storage.ReplicationType) *VolumeLayout {
 	replicationTypeIndex := repType.GetReplicationLevelIndex()
 	if t.replicaType2VolumeLayout[replicationTypeIndex] == nil {
-		log.Println("adding replication type", repType)
+		glog.V(0).Infoln("adding replication type", repType)
 		t.replicaType2VolumeLayout[replicationTypeIndex] = NewVolumeLayout(repType, t.volumeSizeLimit, t.pulse)
 	}
 	return t.replicaType2VolumeLayout[replicationTypeIndex]
diff --git a/go/topology/topology_compact.go b/go/topology/topology_compact.go
index 1e5c4dd11..45ddda174 100644
--- a/go/topology/topology_compact.go
+++ b/go/topology/topology_compact.go
@@ -5,7 +5,7 @@ import (
 	"code.google.com/p/weed-fs/go/util"
 	"encoding/json"
 	"errors"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"net/url"
 	"time"
 )
@@ -14,12 +14,12 @@ func batchVacuumVolumeCheck(vl *VolumeLayout, vid storage.VolumeId, locationlist
 	ch := make(chan bool, locationlist.Length())
 	for index, dn := range locationlist.list {
 		go func(index int, url string, vid storage.VolumeId) {
-			//log.Println(index, "Check vacuuming", vid, "on", dn.Url())
+			//glog.V(0).Infoln(index, "Check vacuuming", vid, "on", dn.Url())
 			if e, ret := vacuumVolume_Check(url, vid, garbageThreshold); e != nil {
-				//log.Println(index, "Error when checking vacuuming", vid, "on", url, e)
+				//glog.V(0).Infoln(index, "Error when checking vacuuming", vid, "on", url, e)
 				ch <- false
 			} else {
-				//log.Println(index, "Checked vacuuming", vid, "on", url, "needVacuum", ret)
+				//glog.V(0).Infoln(index, "Checked vacuuming", vid, "on", url, "needVacuum", ret)
 				ch <- ret
 			}
 		}(index, dn.Url(), vid)
@@ -41,12 +41,12 @@ func batchVacuumVolumeCompact(vl *VolumeLayout, vid storage.VolumeId, locationli
 	ch := make(chan bool, locationlist.Length())
 	for index, dn := range locationlist.list {
 		go func(index int, url string, vid storage.VolumeId) {
-			log.Println(index, "Start vacuuming", vid, "on", url)
+			glog.V(0).Infoln(index, "Start vacuuming", vid, "on", url)
 			if e := vacuumVolume_Compact(url, vid); e != nil {
-				log.Println(index, "Error when vacuuming", vid, "on", url, e)
+				glog.V(0).Infoln(index, "Error when vacuuming", vid, "on", url, e)
 				ch <- false
 			} else {
-				log.Println(index, "Complete vacuuming", vid, "on", url)
+				glog.V(0).Infoln(index, "Complete vacuuming", vid, "on", url)
 				ch <- true
 			}
 		}(index, dn.Url(), vid)
@@ -65,12 +65,12 @@ func batchVacuumVolumeCompact(vl *VolumeLayout, vid storage.VolumeId, locationli
 func batchVacuumVolumeCommit(vl *VolumeLayout, vid storage.VolumeId, locationlist *VolumeLocationList) bool {
 	isCommitSuccess := true
 	for _, dn := range locationlist.list {
-		log.Println("Start Commiting vacuum", vid, "on", dn.Url())
+		glog.V(0).Infoln("Start Commiting vacuum", vid, "on", dn.Url())
 		if e := vacuumVolume_Commit(dn.Url(), vid); e != nil {
-			log.Println("Error when committing vacuum", vid, "on", dn.Url(), e)
+			glog.V(0).Infoln("Error when committing vacuum", vid, "on", dn.Url(), e)
 			isCommitSuccess = false
 		} else {
-			log.Println("Complete Commiting vacuum", vid, "on", dn.Url())
+			glog.V(0).Infoln("Complete Commiting vacuum", vid, "on", dn.Url())
 		}
 	}
 	if isCommitSuccess {
@@ -104,7 +104,7 @@ func vacuumVolume_Check(urlLocation string, vid storage.VolumeId, garbageThresho
 	values.Add("garbageThreshold", garbageThreshold)
 	jsonBlob, err := util.Post("http://"+urlLocation+"/admin/vacuum_volume_check", values)
 	if err != nil {
-		log.Println("parameters:", values)
+		glog.V(0).Infoln("parameters:", values)
 		return err, false
 	}
 	var ret VacuumVolumeResult
diff --git a/go/topology/topology_event_handling.go b/go/topology/topology_event_handling.go
index fff9b47c8..c780e2beb 100644
--- a/go/topology/topology_event_handling.go
+++ b/go/topology/topology_event_handling.go
@@ -2,7 +2,7 @@ package topology
 
 import (
 	"code.google.com/p/weed-fs/go/storage"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"math/rand"
 	"time"
 )
@@ -28,10 +28,10 @@ func (t *Topology) StartRefreshWritableVolumes(garbageThreshold string) {
 				t.SetVolumeCapacityFull(v)
 			case dn := <-t.chanRecoveredDataNodes:
 				t.RegisterRecoveredDataNode(dn)
-				log.Println("DataNode", dn, "is back alive!")
+				glog.V(0).Infoln("DataNode", dn, "is back alive!")
 			case dn := <-t.chanDeadDataNodes:
 				t.UnRegisterDataNode(dn)
-				log.Println("DataNode", dn, "is dead!")
+				glog.V(0).Infoln("DataNode", dn, "is dead!")
 			}
 		}
 	}()
@@ -48,7 +48,7 @@ func (t *Topology) SetVolumeCapacityFull(volumeInfo storage.VolumeInfo) bool {
 }
 func (t *Topology) UnRegisterDataNode(dn *DataNode) {
 	for _, v := range dn.volumes {
-		log.Println("Removing Volume", v.Id, "from the dead volume server", dn)
+		glog.V(0).Infoln("Removing Volume", v.Id, "from the dead volume server", dn)
 		vl := t.GetVolumeLayout(v.RepType)
 		vl.SetVolumeUnavailable(dn, v.Id)
 	}
diff --git a/go/topology/volume_layout.go b/go/topology/volume_layout.go
index e54491268..a0451cc00 100644
--- a/go/topology/volume_layout.go
+++ b/go/topology/volume_layout.go
@@ -3,7 +3,7 @@ package topology
 import (
 	"code.google.com/p/weed-fs/go/storage"
 	"errors"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"math/rand"
 	"sync"
 )
@@ -59,7 +59,7 @@ func (vl *VolumeLayout) Lookup(vid storage.VolumeId) []*DataNode {
 func (vl *VolumeLayout) PickForWrite(count int, dataCenter string) (*storage.VolumeId, int, *VolumeLocationList, error) {
 	len_writers := len(vl.writables)
 	if len_writers <= 0 {
-		log.Println("No more writable volumes!")
+		glog.V(0).Infoln("No more writable volumes!")
 		return nil, 0, nil, errors.New("No more writable volumes!")
 	}
 	if dataCenter == "" {
@@ -107,7 +107,7 @@ func (vl *VolumeLayout) GetActiveVolumeCount(dataCenter string) int {
 func (vl *VolumeLayout) removeFromWritable(vid storage.VolumeId) bool {
 	for i, v := range vl.writables {
 		if v == vid {
-			log.Println("Volume", vid, "becomes unwritable")
+			glog.V(0).Infoln("Volume", vid, "becomes unwritable")
 			vl.writables = append(vl.writables[:i], vl.writables[i+1:]...)
 			return true
 		}
@@ -120,7 +120,7 @@ func (vl *VolumeLayout) setVolumeWritable(vid storage.VolumeId) bool {
 			return false
 		}
 	}
-	log.Println("Volume", vid, "becomes writable")
+	glog.V(0).Infoln("Volume", vid, "becomes writable")
 	vl.writables = append(vl.writables, vid)
 	return true
 }
@@ -131,7 +131,7 @@ func (vl *VolumeLayout) SetVolumeUnavailable(dn *DataNode, vid storage.VolumeId)
 
 	if vl.vid2location[vid].Remove(dn) {
 		if vl.vid2location[vid].Length() < vl.repType.GetCopyCount() {
-			log.Println("Volume", vid, "has", vl.vid2location[vid].Length(), "replica, less than required", vl.repType.GetCopyCount())
+			glog.V(0).Infoln("Volume", vid, "has", vl.vid2location[vid].Length(), "replica, less than required", vl.repType.GetCopyCount())
 			return vl.removeFromWritable(vid)
 		}
 	}
@@ -153,7 +153,7 @@ func (vl *VolumeLayout) SetVolumeCapacityFull(vid storage.VolumeId) bool {
 	vl.accessLock.Lock()
 	defer vl.accessLock.Unlock()
 
-	// log.Println("Volume", vid, "reaches full capacity.")
+	// glog.V(0).Infoln("Volume", vid, "reaches full capacity.")
 	return vl.removeFromWritable(vid)
 }
 
diff --git a/go/util/config.go b/go/util/config.go
index 6ac8a3a65..43c5027e1 100644
--- a/go/util/config.go
+++ b/go/util/config.go
@@ -11,7 +11,7 @@ package util
 import (
 	"bytes"
 	"encoding/json"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"os"
 )
 
@@ -32,7 +32,7 @@ func LoadConfig(filename string) *Config {
 	result.filename = filename
 	err := result.parse()
 	if err != nil {
-		log.Fatalf("error loading config file %s: %s", filename, err)
+		glog.Fatalf("error loading config file %s: %s", filename, err)
 	}
 	return result
 }
@@ -42,7 +42,7 @@ func LoadConfigString(s string) *Config {
 	result := newConfig()
 	err := json.Unmarshal([]byte(s), &result.data)
 	if err != nil {
-		log.Fatalf("error parsing config string %s: %s", s, err)
+		glog.Fatalf("error parsing config string %s: %s", s, err)
 	}
 	return result
 }
diff --git a/go/util/post.go b/go/util/post.go
index 6e6ab0003..af5948f77 100644
--- a/go/util/post.go
+++ b/go/util/post.go
@@ -2,7 +2,7 @@ package util
 
 import (
 	"io/ioutil"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"net/http"
 	"net/url"
 )
@@ -10,13 +10,13 @@ import (
 func Post(url string, values url.Values) ([]byte, error) {
 	r, err := http.PostForm(url, values)
 	if err != nil {
-		log.Println("post to", url, err)
+		glog.V(0).Infoln("post to", url, err)
 		return nil, err
 	}
 	defer r.Body.Close()
 	b, err := ioutil.ReadAll(r.Body)
 	if err != nil {
-		log.Println("read post result from", url, err)
+		glog.V(0).Infoln("read post result from", url, err)
 		return nil, err
 	}
 	return b, nil
diff --git a/go/weed/export.go b/go/weed/export.go
index 08d2cd2b9..23c0baf60 100644
--- a/go/weed/export.go
+++ b/go/weed/export.go
@@ -5,7 +5,7 @@ import (
 	"bytes"
 	"code.google.com/p/weed-fs/go/storage"
 	"fmt"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"os"
 	"path"
 	"strconv"
@@ -67,7 +67,7 @@ func runExport(cmd *Command, args []string) bool {
 			fh = os.Stdout
 		} else {
 			if fh, err = os.Create(*dest); err != nil {
-				log.Fatalf("cannot open output tar %s: %s", *dest, err)
+				glog.Fatalf("cannot open output tar %s: %s", *dest, err)
 			}
 		}
 		defer fh.Close()
@@ -84,13 +84,13 @@ func runExport(cmd *Command, args []string) bool {
 	vid := storage.VolumeId(*exportVolumeId)
 	indexFile, err := os.OpenFile(path.Join(*exportVolumePath, fileName+".idx"), os.O_RDONLY, 0644)
 	if err != nil {
-		log.Fatalf("Create Volume Index [ERROR] %s\n", err)
+		glog.Fatalf("Create Volume Index [ERROR] %s\n", err)
 	}
 	defer indexFile.Close()
 
 	nm, err := storage.LoadNeedleMap(indexFile)
 	if err != nil {
-		log.Fatalf("cannot load needle map from %s: %s", indexFile, err)
+		glog.Fatalf("cannot load needle map from %s: %s", indexFile, err)
 	}
 
 	var version storage.Version
@@ -113,7 +113,7 @@ func runExport(cmd *Command, args []string) bool {
 		return nil
 	})
 	if err != nil {
-		log.Fatalf("Export Volume File [ERROR] %s\n", err)
+		glog.Fatalf("Export Volume File [ERROR] %s\n", err)
 	}
 	return true
 }
diff --git a/go/weed/fix.go b/go/weed/fix.go
index 597bc0ef9..81b87eb18 100644
--- a/go/weed/fix.go
+++ b/go/weed/fix.go
@@ -2,7 +2,7 @@ package main
 
 import (
 	"code.google.com/p/weed-fs/go/storage"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"os"
 	"path"
 	"strconv"
@@ -35,7 +35,7 @@ func runFix(cmd *Command, args []string) bool {
 	fileName := strconv.Itoa(*fixVolumeId)
 	indexFile, err := os.OpenFile(path.Join(*fixVolumePath, fileName+".idx"), os.O_WRONLY|os.O_CREATE, 0644)
 	if err != nil {
-		log.Fatalf("Create Volume Index [ERROR] %s\n", err)
+		glog.Fatalf("Create Volume Index [ERROR] %s\n", err)
 	}
 	defer indexFile.Close()
 
@@ -57,7 +57,7 @@ func runFix(cmd *Command, args []string) bool {
 		return nil
 	})
 	if err != nil {
-		log.Fatalf("Export Volume File [ERROR] %s\n", err)
+		glog.Fatalf("Export Volume File [ERROR] %s\n", err)
 	}
 
 	return true
diff --git a/go/weed/master.go b/go/weed/master.go
index ee8f7c6a7..ccf186fac 100644
--- a/go/weed/master.go
+++ b/go/weed/master.go
@@ -8,7 +8,7 @@ import (
 	"code.google.com/p/weed-fs/go/topology"
 	"encoding/json"
 	"errors"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"net/http"
 	"runtime"
 	"strconv"
@@ -205,10 +205,10 @@ func runMaster(cmd *Command, args []string) bool {
 	var e error
 	if topo, e = topology.NewTopology("topo", *confFile, *metaFolder, "weed",
 		uint64(*volumeSizeLimitMB)*1024*1024, *mpulse); e != nil {
-		log.Fatalf("cannot create topology:%s", e)
+		glog.Fatalf("cannot create topology:%s", e)
 	}
 	vg = replication.NewDefaultVolumeGrowth()
-	log.Println("Volume Size Limit is", *volumeSizeLimitMB, "MB")
+	glog.V(0).Infoln("Volume Size Limit is", *volumeSizeLimitMB, "MB")
 	http.HandleFunc("/dir/assign", dirAssignHandler)
 	http.HandleFunc("/dir/lookup", dirLookupHandler)
 	http.HandleFunc("/dir/join", dirJoinHandler)
@@ -222,7 +222,7 @@ func runMaster(cmd *Command, args []string) bool {
 
 	topo.StartRefreshWritableVolumes(*garbageThreshold)
 
-	log.Println("Start Weed Master", VERSION, "at port", strconv.Itoa(*mport))
+	glog.V(0).Infoln("Start Weed Master", VERSION, "at port", strconv.Itoa(*mport))
 	srv := &http.Server{
 		Addr:        ":" + strconv.Itoa(*mport),
 		Handler:     http.DefaultServeMux,
@@ -230,7 +230,7 @@ func runMaster(cmd *Command, args []string) bool {
 	}
 	e = srv.ListenAndServe()
 	if e != nil {
-		log.Fatalf("Fail to start:%s", e)
+		glog.Fatalf("Fail to start:%s", e)
 	}
 	return true
 }
diff --git a/go/weed/shell.go b/go/weed/shell.go
index 4287f2148..14c84a5d1 100644
--- a/go/weed/shell.go
+++ b/go/weed/shell.go
@@ -3,7 +3,7 @@ package main
 import (
 	"bufio"
 	"fmt"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"os"
 )
 
@@ -28,10 +28,10 @@ func runShell(command *Command, args []string) bool {
 	prompt := func() {
 		var err error
 		if _, err = o.WriteString("> "); err != nil {
-			log.Printf("error writing to stdout: %s", err)
+			glog.V(0).Infoln("error writing to stdout:", err)
 		}
 		if err = o.Flush(); err != nil {
-			log.Printf("error flushing stdout: %s", err)
+			glog.V(0).Infoln("error flushing stdout:", err)
 		}
 	}
 	readLine := func() string {
@@ -45,7 +45,7 @@ func runShell(command *Command, args []string) bool {
 	execCmd := func(cmd string) int {
 		if cmd != "" {
 			if _, err := o.WriteString(cmd); err != nil {
-				log.Printf("error writing to stdout: %s", err)
+				glog.V(0).Infoln("error writing to stdout:", err)
 			}
 		}
 		return 0
diff --git a/go/weed/volume.go b/go/weed/volume.go
index a2da22684..532dd3632 100644
--- a/go/weed/volume.go
+++ b/go/weed/volume.go
@@ -4,7 +4,7 @@ import (
 	"code.google.com/p/weed-fs/go/operation"
 	"code.google.com/p/weed-fs/go/replication"
 	"code.google.com/p/weed-fs/go/storage"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"math/rand"
 	"mime"
 	"net/http"
@@ -145,7 +145,7 @@ func GetOrHeadHandler(w http.ResponseWriter, r *http.Request, isGetMethod bool)
 		return
 	}
 	if n.Cookie != cookie {
-		log.Println("request with unmaching cookie from ", r.RemoteAddr, "agent", r.UserAgent())
+		glog.V(0).Infoln("request with unmaching cookie from ", r.RemoteAddr, "agent", r.UserAgent())
 		w.WriteHeader(http.StatusNotFound)
 		return
 	}
@@ -246,7 +246,7 @@ func DeleteHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if n.Cookie != cookie {
-		log.Println("delete with unmaching cookie from ", r.RemoteAddr, "agent", r.UserAgent())
+		glog.V(0).Infoln("delete with unmaching cookie from ", r.RemoteAddr, "agent", r.UserAgent())
 		return
 	}
 
@@ -283,7 +283,7 @@ func parseURLPath(path string) (vid, fid, filename, ext string) {
 		commaIndex := strings.LastIndex(path[sepIndex:], ",")
 		if commaIndex <= 0 {
 			if "favicon.ico" != path[sepIndex+1:] {
-				log.Println("unknown file id", path[sepIndex+1:])
+				glog.V(0).Infoln("unknown file id", path[sepIndex+1:])
 			}
 			return
 		}
@@ -311,23 +311,23 @@ func runVolume(cmd *Command, args []string) bool {
 		if max, e := strconv.Atoi(maxString); e == nil {
 			maxCounts = append(maxCounts, max)
 		} else {
-			log.Fatalf("The max specified in -max not a valid number %s", max)
+			glog.Fatalf("The max specified in -max not a valid number %s", max)
 		}
 	}
 	if len(folders) != len(maxCounts) {
-		log.Fatalf("%d directories by -dir, but only %d max is set by -max", len(folders), len(maxCounts))
+		glog.Fatalf("%d directories by -dir, but only %d max is set by -max", len(folders), len(maxCounts))
 	}
 	for _, folder := range folders {
 		fileInfo, err := os.Stat(folder)
 		if err != nil {
-			log.Fatalf("No Existing Folder:%s", folder)
+			glog.Fatalf("No Existing Folder:%s", folder)
 		}
 		if !fileInfo.IsDir() {
-			log.Fatalf("Volume Folder should not be a file:%s", folder)
+			glog.Fatalf("Volume Folder should not be a file:%s", folder)
 		}
 		perm := fileInfo.Mode().Perm()
-		log.Println("Volume Folder", folder)
-		log.Println("Permission:", perm)
+		glog.V(0).Infoln("Volume Folder", folder)
+		glog.V(0).Infoln("Permission:", perm)
 	}
 
 	if *publicUrl == "" {
@@ -355,7 +355,7 @@ func runVolume(cmd *Command, args []string) bool {
 			if err == nil {
 				if !connected {
 					connected = true
-					log.Println("Reconnected with master")
+					glog.V(0).Infoln("Reconnected with master")
 				}
 			} else {
 				if connected {
@@ -365,9 +365,9 @@ func runVolume(cmd *Command, args []string) bool {
 			time.Sleep(time.Duration(float32(*vpulse*1e3)*(1+rand.Float32())) * time.Millisecond)
 		}
 	}()
-	log.Println("store joined at", *masterNode)
+	glog.V(0).Infoln("store joined at", *masterNode)
 
-	log.Println("Start Weed volume server", VERSION, "at http://"+*ip+":"+strconv.Itoa(*vport))
+	glog.V(0).Infoln("Start Weed volume server", VERSION, "at http://"+*ip+":"+strconv.Itoa(*vport))
 	srv := &http.Server{
 		Addr:        ":" + strconv.Itoa(*vport),
 		Handler:     http.DefaultServeMux,
@@ -375,7 +375,7 @@ func runVolume(cmd *Command, args []string) bool {
 	}
 	e := srv.ListenAndServe()
 	if e != nil {
-		log.Fatalf("Fail to start:%s", e.Error())
+		glog.Fatalf("Fail to start:%s", e.Error())
 	}
 	return true
 }
diff --git a/go/weed/volume_test.go b/go/weed/volume_test.go
index 09340910b..601d8aaf5 100644
--- a/go/weed/volume_test.go
+++ b/go/weed/volume_test.go
@@ -7,5 +7,5 @@ import (
 )
 
 func TestXYZ(t *testing.T) {
-	println("Last-Modified", time.Unix(int64(1373273596), 0).UTC().Format(http.TimeFormat))
+	glog.V(4).Infoln("Last-Modified", time.Unix(int64(1373273596), 0).UTC().Format(http.TimeFormat))
 }
diff --git a/go/weed/weed.go b/go/weed/weed.go
index 773396aa1..a2e670b29 100644
--- a/go/weed/weed.go
+++ b/go/weed/weed.go
@@ -5,7 +5,7 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"log"
+	"code.google.com/p/weed-fs/go/glog"
 	"math/rand"
 	"net/http"
 	"os"
@@ -42,6 +42,7 @@ func setExitStatus(n int) {
 }
 
 func main() {
+  glog.ToStderrAndLog()
 	rand.Seed(time.Now().UnixNano())
 	flag.Usage = usage
 	flag.Parse()
@@ -207,7 +208,7 @@ func writeJson(w http.ResponseWriter, r *http.Request, obj interface{}) (err err
 // wrapper for writeJson - just logs errors
 func writeJsonQuiet(w http.ResponseWriter, r *http.Request, obj interface{}) {
 	if err := writeJson(w, r, obj); err != nil {
-		log.Printf("error writing JSON %s: %s", obj, err)
+		glog.V(0).Infof("error writing JSON %s: %s", obj, err.Error())
 	}
 }
 func writeJsonError(w http.ResponseWriter, r *http.Request, err error) {
@@ -218,6 +219,6 @@ func writeJsonError(w http.ResponseWriter, r *http.Request, err error) {
 
 func debug(params ...interface{}) {
 	if *IsDebug {
-		log.Println(params)
+		glog.V(0).Infoln(params)
 	}
 }