diff --git a/weed/filesys/dirty_pages_continuous.go b/weed/filesys/dirty_pages_continuous.go
index 88b50ce41..19401b94e 100644
--- a/weed/filesys/dirty_pages_continuous.go
+++ b/weed/filesys/dirty_pages_continuous.go
@@ -147,3 +147,5 @@ func (pages *ContinuousDirtyPages) ReadDirtyDataAt(data []byte, startOffset int6
 func (pages *ContinuousDirtyPages) GetStorageOptions() (collection, replication string) {
 	return pages.collection, pages.replication
 }
+func (pages ContinuousDirtyPages) Destroy() {
+}
diff --git a/weed/filesys/dirty_pages_temp_file.go b/weed/filesys/dirty_pages_temp_file.go
index 6a22889dc..25fce5d48 100644
--- a/weed/filesys/dirty_pages_temp_file.go
+++ b/weed/filesys/dirty_pages_temp_file.go
@@ -12,22 +12,21 @@ import (
 )
 
 type TempFileDirtyPages struct {
-	f                *File
-	tf               *os.File
-	writtenIntervals *page_writer.WrittenContinuousIntervals
-	writeWaitGroup   sync.WaitGroup
-	pageAddLock      sync.Mutex
-	chunkAddLock     sync.Mutex
-	lastErr          error
-	collection       string
-	replication      string
+	f              *File
+	writeWaitGroup sync.WaitGroup
+	pageAddLock    sync.Mutex
+	chunkAddLock   sync.Mutex
+	lastErr        error
+	collection     string
+	replication    string
+	chunkedFile    *page_writer.ChunkedFileWriter
 }
 
-func newTempFileDirtyPages(file *File) *TempFileDirtyPages {
+func newTempFileDirtyPages(file *File, chunkSize int64) *TempFileDirtyPages {
 
 	tempFile := &TempFileDirtyPages{
-		f:                file,
-		writtenIntervals: &page_writer.WrittenContinuousIntervals{},
+		f:           file,
+		chunkedFile: page_writer.NewChunkedFileWriter(file.wfs.option.getTempFilePageDir(), chunkSize),
 	}
 
 	return tempFile
@@ -38,28 +37,8 @@ func (pages *TempFileDirtyPages) AddPage(offset int64, data []byte) {
 	pages.pageAddLock.Lock()
 	defer pages.pageAddLock.Unlock()
 
-	if pages.tf == nil {
-		tf, err := os.CreateTemp(pages.f.wfs.option.getTempFilePageDir(), "")
-		if err != nil {
-			glog.Errorf("create temp file: %v", err)
-			pages.lastErr = err
-			return
-		}
-		pages.tf = tf
-		pages.writtenIntervals.TempFile = tf
-		pages.writtenIntervals.LastOffset = 0
-	}
-
-	writtenOffset := pages.writtenIntervals.LastOffset
-	dataSize := int64(len(data))
-
-	// glog.V(4).Infof("%s AddPage %v at %d [%d,%d)", pages.f.fullpath(), pages.tf.Name(), writtenOffset, offset, offset+dataSize)
-
-	if _, err := pages.tf.WriteAt(data, writtenOffset); err != nil {
+	if _, err := pages.chunkedFile.WriteAt(data, offset); err != nil {
 		pages.lastErr = err
-	} else {
-		pages.writtenIntervals.AddInterval(writtenOffset, len(data), offset)
-		pages.writtenIntervals.LastOffset += dataSize
 	}
 
 	// pages.writtenIntervals.debug()
@@ -68,54 +47,38 @@ func (pages *TempFileDirtyPages) AddPage(offset int64, data []byte) {
 }
 
 func (pages *TempFileDirtyPages) FlushData() error {
-
-	pages.saveExistingPagesToStorage()
+	pages.saveChunkedFileToStorage()
 	pages.writeWaitGroup.Wait()
 	if pages.lastErr != nil {
 		return fmt.Errorf("flush data: %v", pages.lastErr)
 	}
-	pages.pageAddLock.Lock()
-	defer pages.pageAddLock.Unlock()
-	if pages.tf != nil {
-
-		pages.writtenIntervals.TempFile = nil
-		pages.writtenIntervals.Lists = nil
-
-		pages.tf.Close()
-		os.Remove(pages.tf.Name())
-		pages.tf = nil
-	}
 	return nil
 }
 
-func (pages *TempFileDirtyPages) saveExistingPagesToStorage() {
+func (pages *TempFileDirtyPages) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) {
+	return pages.chunkedFile.ReadDataAt(data, startOffset)
+}
 
-	pageSize := pages.f.wfs.option.ChunkSizeLimit
+func (pages *TempFileDirtyPages) GetStorageOptions() (collection, replication string) {
+	return pages.collection, pages.replication
+}
 
-	// glog.V(4).Infof("%v saveExistingPagesToStorage %d lists", pages.f.Name, len(pages.writtenIntervals.lists))
+func (pages *TempFileDirtyPages) saveChunkedFileToStorage() {
 
-	for _, list := range pages.writtenIntervals.Lists {
-		listStopOffset := list.Offset() + list.Size()
-		for uploadedOffset := int64(0); uploadedOffset < listStopOffset; uploadedOffset += pageSize {
-			start, stop := max(list.Offset(), uploadedOffset), min(listStopOffset, uploadedOffset+pageSize)
-			if start >= stop {
-				continue
-			}
-			// glog.V(4).Infof("uploading %v [%d,%d) %d/%d", pages.f.Name, start, stop, i, len(pages.writtenIntervals.lists))
-			pages.saveToStorage(list.ToReader(start, stop), start, stop-start)
-		}
-	}
+	pages.chunkedFile.ProcessEachInterval(func(file *os.File, logicChunkIndex int, interval *page_writer.PageChunkWrittenInterval) {
+		reader := page_writer.NewFileIntervalReader(pages.chunkedFile, logicChunkIndex, interval)
+		pages.saveChunkedFileIntevalToStorage(reader, int64(logicChunkIndex)*pages.chunkedFile.ChunkSize, interval.Size())
+	})
 
 }
 
-func (pages *TempFileDirtyPages) saveToStorage(reader io.Reader, offset int64, size int64) {
+func (pages *TempFileDirtyPages) saveChunkedFileIntevalToStorage(reader io.Reader, offset int64, size int64) {
 
 	mtime := time.Now().UnixNano()
 	pages.writeWaitGroup.Add(1)
 	writer := func() {
 		defer pages.writeWaitGroup.Done()
 
-		reader = io.LimitReader(reader, size)
 		chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(pages.f.fullpath())(reader, pages.f.Name, offset)
 		if err != nil {
 			glog.V(0).Infof("%s saveToStorage [%d,%d): %v", pages.f.fullpath(), offset, offset+size, err)
@@ -135,12 +98,9 @@ func (pages *TempFileDirtyPages) saveToStorage(reader io.Reader, offset int64, s
 	} else {
 		go writer()
 	}
-}
 
-func (pages *TempFileDirtyPages) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) {
-	return pages.writtenIntervals.ReadDataAt(data, startOffset)
 }
 
-func (pages *TempFileDirtyPages) GetStorageOptions() (collection, replication string) {
-	return pages.collection, pages.replication
+func (pages TempFileDirtyPages) Destroy() {
+	pages.chunkedFile.Destroy()
 }
diff --git a/weed/filesys/filehandle.go b/weed/filesys/filehandle.go
index d92b17b5b..a551e6e10 100644
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@@ -222,6 +222,7 @@ func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) err
 		fh.reader = nil
 
 		fh.f.wfs.ReleaseHandle(fh.f.fullpath(), fuse.HandleID(fh.handle))
+		fh.dirtyPages.Destroy()
 	}
 
 	if fh.f.isOpen < 0 {
diff --git a/weed/filesys/page_writer.go b/weed/filesys/page_writer.go
index 9c9e38968..8e52f9f67 100644
--- a/weed/filesys/page_writer.go
+++ b/weed/filesys/page_writer.go
@@ -24,7 +24,7 @@ func newPageWriter(file *File, chunkSize int64) *PageWriter {
 	pw := &PageWriter{
 		f:             file,
 		chunkSize:     chunkSize,
-		randomWriter:  newTempFileDirtyPages(file),
+		randomWriter:  newTempFileDirtyPages(file, chunkSize),
 		streamWriter:  newContinuousDirtyPages(file),
 		writerPattern: NewWriterPattern(file.Name, chunkSize),
 	}
@@ -63,11 +63,23 @@ func (pw *PageWriter) FlushData() error {
 	return pw.randomWriter.FlushData()
 }
 
-func (pw *PageWriter) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) {
-	glog.V(4).Infof("ReadDirtyDataAt %v [%d, %d)", pw.f.fullpath(), startOffset, startOffset+int64(len(data)))
-	m1 := pw.streamWriter.ReadDirtyDataAt(data, startOffset)
-	m2 := pw.randomWriter.ReadDirtyDataAt(data, startOffset)
-	return max(m1, m2)
+func (pw *PageWriter) ReadDirtyDataAt(data []byte, offset int64) (maxStop int64) {
+	glog.V(4).Infof("ReadDirtyDataAt %v [%d, %d)", pw.f.fullpath(), offset, offset+int64(len(data)))
+
+	chunkIndex := offset / pw.chunkSize
+	for i := chunkIndex; len(data) > 0; i++ {
+		readSize := min(int64(len(data)), (i+1)*pw.chunkSize-offset)
+
+		m1 := pw.streamWriter.ReadDirtyDataAt(data[:readSize], offset)
+		m2 := pw.randomWriter.ReadDirtyDataAt(data[:readSize], offset)
+
+		maxStop = max(maxStop, max(m1, m2))
+
+		offset += readSize
+		data = data[readSize:]
+	}
+
+	return
 }
 
 func (pw *PageWriter) GetStorageOptions() (collection, replication string) {
@@ -76,3 +88,7 @@ func (pw *PageWriter) GetStorageOptions() (collection, replication string) {
 	}
 	return pw.randomWriter.GetStorageOptions()
 }
+
+func (pw *PageWriter) Destroy() {
+	pw.randomWriter.Destroy()
+}
diff --git a/weed/filesys/page_writer/chunked_file_writer.go b/weed/filesys/page_writer/chunked_file_writer.go
new file mode 100644
index 000000000..180a2039d
--- /dev/null
+++ b/weed/filesys/page_writer/chunked_file_writer.go
@@ -0,0 +1,152 @@
+package page_writer
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"io"
+	"os"
+	"sync"
+)
+
+// ChunkedFileWriter assumes the write requests will come in within chunks
+type ChunkedFileWriter struct {
+	dir                     string
+	file                    *os.File
+	logicToActualChunkIndex map[int]int
+	chunkUsages             []*PageChunkWrittenIntervalList
+	ChunkSize               int64
+	sync.Mutex
+}
+
+var _ = io.WriterAt(&ChunkedFileWriter{})
+
+func NewChunkedFileWriter(dir string, chunkSize int64) *ChunkedFileWriter {
+	return &ChunkedFileWriter{
+		dir:                     dir,
+		file:                    nil,
+		logicToActualChunkIndex: make(map[int]int),
+		ChunkSize:               chunkSize,
+	}
+}
+
+func (cw *ChunkedFileWriter) WriteAt(p []byte, off int64) (n int, err error) {
+	cw.Lock()
+	defer cw.Unlock()
+
+	if cw.file == nil {
+		cw.file, err = os.CreateTemp(cw.dir, "")
+		if err != nil {
+			glog.Errorf("create temp file: %v", err)
+			return
+		}
+	}
+
+	actualOffset, chunkUsage := cw.toActualWriteOffset(off)
+	n, err = cw.file.WriteAt(p, actualOffset)
+	if err == nil {
+		startOffset := off % cw.ChunkSize
+		chunkUsage.MarkWritten(startOffset, startOffset+int64(n))
+	}
+	return
+}
+
+func (cw *ChunkedFileWriter) ReadDataAt(p []byte, off int64) (maxStop int64) {
+	cw.Lock()
+	defer cw.Unlock()
+
+	if cw.file == nil {
+		return
+	}
+
+	logicChunkIndex := off / cw.ChunkSize
+	actualChunkIndex, chunkUsage := cw.toActualReadOffset(off)
+	if chunkUsage != nil {
+		for t := chunkUsage.head.next; t != chunkUsage.tail; t = t.next {
+			logicStart := max(off, logicChunkIndex*cw.ChunkSize+t.startOffset)
+			logicStop := min(off+int64(len(p)), logicChunkIndex*cw.ChunkSize+t.stopOffset)
+			if logicStart < logicStop {
+				actualStart := logicStart - logicChunkIndex*cw.ChunkSize + int64(actualChunkIndex)*cw.ChunkSize
+				_, err := cw.file.ReadAt(p[logicStart-off:logicStop-off], actualStart)
+				if err != nil {
+					glog.Errorf("reading temp file: %v", err)
+					break
+				}
+				maxStop = max(maxStop, logicStop)
+			}
+		}
+	}
+	return
+}
+
+func (cw *ChunkedFileWriter) toActualWriteOffset(logicOffset int64) (actualOffset int64, chunkUsage *PageChunkWrittenIntervalList) {
+	logicChunkIndex := int(logicOffset / cw.ChunkSize)
+	offsetRemainder := logicOffset % cw.ChunkSize
+	existingActualChunkIndex, found := cw.logicToActualChunkIndex[logicChunkIndex]
+	if found {
+		return int64(existingActualChunkIndex)*cw.ChunkSize + offsetRemainder, cw.chunkUsages[existingActualChunkIndex]
+	}
+	cw.logicToActualChunkIndex[logicChunkIndex] = len(cw.chunkUsages)
+	chunkUsage = newPageChunkWrittenIntervalList()
+	cw.chunkUsages = append(cw.chunkUsages, chunkUsage)
+	return int64(len(cw.chunkUsages)-1)*cw.ChunkSize + offsetRemainder, chunkUsage
+}
+
+func (cw *ChunkedFileWriter) toActualReadOffset(logicOffset int64) (actualChunkIndex int, chunkUsage *PageChunkWrittenIntervalList) {
+	logicChunkIndex := int(logicOffset / cw.ChunkSize)
+	existingActualChunkIndex, found := cw.logicToActualChunkIndex[logicChunkIndex]
+	if found {
+		return existingActualChunkIndex, cw.chunkUsages[existingActualChunkIndex]
+	}
+	return 0, nil
+}
+
+func (cw *ChunkedFileWriter) ProcessEachInterval(process func(file *os.File, logicChunkIndex int, interval *PageChunkWrittenInterval)) {
+	for logicChunkIndex, actualChunkIndex := range cw.logicToActualChunkIndex {
+		chunkUsage := cw.chunkUsages[actualChunkIndex]
+		for t := chunkUsage.head.next; t != chunkUsage.tail; t = t.next {
+			process(cw.file, logicChunkIndex, t)
+		}
+	}
+}
+func (cw *ChunkedFileWriter) Destroy() {
+	if cw.file != nil {
+		cw.file.Close()
+		os.Remove(cw.file.Name())
+	}
+}
+
+type FileIntervalReader struct {
+	f           *os.File
+	startOffset int64
+	stopOffset  int64
+	position    int64
+}
+
+var _ = io.Reader(&FileIntervalReader{})
+
+func NewFileIntervalReader(cw *ChunkedFileWriter, logicChunkIndex int, interval *PageChunkWrittenInterval) *FileIntervalReader {
+	actualChunkIndex, found := cw.logicToActualChunkIndex[logicChunkIndex]
+	if !found {
+		// this should never happen
+		return nil
+	}
+	return &FileIntervalReader{
+		f:           cw.file,
+		startOffset: int64(actualChunkIndex)*cw.ChunkSize + interval.startOffset,
+		stopOffset:  int64(actualChunkIndex)*cw.ChunkSize + interval.stopOffset,
+		position:    0,
+	}
+}
+
+func (fr *FileIntervalReader) Read(p []byte) (n int, err error) {
+	readSize := minInt(len(p), int(fr.stopOffset-fr.startOffset-fr.position))
+	n, err = fr.f.ReadAt(p[:readSize], fr.startOffset+fr.position)
+	if err == nil || err == io.EOF {
+		fr.position += int64(n)
+		if fr.stopOffset-fr.startOffset-fr.position == 0 {
+			// return a tiny bit faster
+			err = io.EOF
+			return
+		}
+	}
+	return
+}
diff --git a/weed/filesys/page_writer/chunked_file_writer_test.go b/weed/filesys/page_writer/chunked_file_writer_test.go
new file mode 100644
index 000000000..1c72c77d4
--- /dev/null
+++ b/weed/filesys/page_writer/chunked_file_writer_test.go
@@ -0,0 +1,60 @@
+package page_writer
+
+import (
+	"github.com/stretchr/testify/assert"
+	"os"
+	"testing"
+)
+
+func TestChunkedFileWriter_toActualOffset(t *testing.T) {
+	cw := NewChunkedFileWriter("", 16)
+
+	writeToFile(cw, 50, 60)
+	writeToFile(cw, 60, 64)
+
+	writeToFile(cw, 32, 40)
+	writeToFile(cw, 42, 48)
+
+	writeToFile(cw, 48, 50)
+
+	assert.Equal(t, 1, cw.chunkUsages[0].size(), "fully covered")
+	assert.Equal(t, 2, cw.chunkUsages[1].size(), "2 intervals")
+
+}
+
+func writeToFile(cw *ChunkedFileWriter, startOffset int64, stopOffset int64) {
+
+	_, chunkUsage := cw.toActualWriteOffset(startOffset)
+
+	// skip doing actual writing
+
+	innerOffset := startOffset % cw.ChunkSize
+	chunkUsage.MarkWritten(innerOffset, innerOffset+stopOffset-startOffset)
+
+}
+
+func TestWriteChunkedFile(t *testing.T) {
+	x := NewChunkedFileWriter(os.TempDir(), 20)
+	defer x.Destroy()
+	y := NewChunkedFileWriter(os.TempDir(), 12)
+	defer y.Destroy()
+
+	batchSize := 4
+	buf := make([]byte, batchSize)
+	for i := 0; i < 256; i++ {
+		for x := 0; x < batchSize; x++ {
+			buf[x] = byte(i)
+		}
+		x.WriteAt(buf, int64(i*batchSize))
+		y.WriteAt(buf, int64((255-i)*batchSize))
+	}
+
+	a := make([]byte, 1)
+	b := make([]byte, 1)
+	for i := 0; i < 256*batchSize; i++ {
+		x.ReadDataAt(a, int64(i))
+		y.ReadDataAt(b, int64(256*batchSize-1-i))
+		assert.Equal(t, a[0], b[0], "same read")
+	}
+
+}
diff --git a/weed/filesys/page_writer/dirty_pages.go b/weed/filesys/page_writer/dirty_pages.go
index c18f847b7..955627d67 100644
--- a/weed/filesys/page_writer/dirty_pages.go
+++ b/weed/filesys/page_writer/dirty_pages.go
@@ -5,4 +5,24 @@ type DirtyPages interface {
 	FlushData() error
 	ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64)
 	GetStorageOptions() (collection, replication string)
+	Destroy()
+}
+
+func max(x, y int64) int64 {
+	if x > y {
+		return x
+	}
+	return y
+}
+func min(x, y int64) int64 {
+	if x < y {
+		return x
+	}
+	return y
+}
+func minInt(x, y int) int {
+	if x < y {
+		return x
+	}
+	return y
 }
diff --git a/weed/filesys/page_writer/dirty_pages_temp_interval.go b/weed/filesys/page_writer/dirty_pages_temp_interval.go
index aeaf0ec6f..623346fa8 100644
--- a/weed/filesys/page_writer/dirty_pages_temp_interval.go
+++ b/weed/filesys/page_writer/dirty_pages_temp_interval.go
@@ -287,16 +287,3 @@ func (f *FileSectionReader) Read(p []byte) (n int, err error) {
 	}
 	return
 }
-
-func max(x, y int64) int64 {
-	if x > y {
-		return x
-	}
-	return y
-}
-func min(x, y int64) int64 {
-	if x < y {
-		return x
-	}
-	return y
-}
diff --git a/weed/filesys/page_writer/page_chunk_interval_list.go b/weed/filesys/page_writer/page_chunk_interval_list.go
index e626b2a7f..09fc45bfb 100644
--- a/weed/filesys/page_writer/page_chunk_interval_list.go
+++ b/weed/filesys/page_writer/page_chunk_interval_list.go
@@ -10,6 +10,10 @@ type PageChunkWrittenInterval struct {
 	next        *PageChunkWrittenInterval
 }
 
+func (interval *PageChunkWrittenInterval) Size() int64 {
+	return interval.stopOffset - interval.startOffset
+}
+
 // PageChunkWrittenIntervalList mark written intervals within one page chunk
 type PageChunkWrittenIntervalList struct {
 	head *PageChunkWrittenInterval