diff --git a/weed/command/fuse.go b/weed/command/fuse.go
index 23055c84d..beed3349e 100644
--- a/weed/command/fuse.go
+++ b/weed/command/fuse.go
@@ -146,15 +146,15 @@ func runFuse(cmd *Command, args []string) bool {
 				panic(fmt.Errorf("concurrentWriters: %s", err))
 			}
 		case "cacheDir":
-			mountOptions.cacheDir = &parameter.value
+			mountOptions.cacheDirForRead = &parameter.value
 		case "cacheCapacityMB":
 			if parsed, err := strconv.ParseInt(parameter.value, 0, 64); err == nil {
-				mountOptions.cacheSizeMB = &parsed
+				mountOptions.cacheSizeMBForRead = &parsed
 			} else {
 				panic(fmt.Errorf("cacheCapacityMB: %s", err))
 			}
 		case "cacheDirWrite":
-			mountOptions.cacheDirWrite = &parameter.value
+			mountOptions.cacheDirForWrite = &parameter.value
 		case "dataCenter":
 			mountOptions.dataCenter = &parameter.value
 		case "allowOthers":
diff --git a/weed/command/mount.go b/weed/command/mount.go
index bb4325b1a..22bd29a00 100644
--- a/weed/command/mount.go
+++ b/weed/command/mount.go
@@ -17,9 +17,9 @@ type MountOptions struct {
 	ttlSec             *int
 	chunkSizeLimitMB   *int
 	concurrentWriters  *int
-	cacheDir           *string
-	cacheDirWrite      *string
-	cacheSizeMB        *int64
+	cacheDirForRead    *string
+	cacheDirForWrite   *string
+	cacheSizeMBForRead *int64
 	dataCenter         *string
 	allowOthers        *bool
 	umaskString        *string
@@ -55,9 +55,9 @@ func init() {
 	mountOptions.ttlSec = cmdMount.Flag.Int("ttl", 0, "file ttl in seconds")
 	mountOptions.chunkSizeLimitMB = cmdMount.Flag.Int("chunkSizeLimitMB", 2, "local write buffer size, also chunk large files")
 	mountOptions.concurrentWriters = cmdMount.Flag.Int("concurrentWriters", 32, "limit concurrent goroutine writers")
-	mountOptions.cacheDir = cmdMount.Flag.String("cacheDir", os.TempDir(), "local cache directory for file chunks and meta data")
-	mountOptions.cacheSizeMB = cmdMount.Flag.Int64("cacheCapacityMB", 0, "file chunk read cache capacity in MB")
-	mountOptions.cacheDirWrite = cmdMount.Flag.String("cacheDirWrite", os.TempDir(), "buffer writes mostly for large files")
+	mountOptions.cacheDirForRead = cmdMount.Flag.String("cacheDir", os.TempDir(), "local cache directory for file chunks and meta data")
+	mountOptions.cacheSizeMBForRead = cmdMount.Flag.Int64("cacheCapacityMB", 0, "file chunk read cache capacity in MB")
+	mountOptions.cacheDirForWrite = cmdMount.Flag.String("cacheDirWrite", os.TempDir(), "buffer writes mostly for large files")
 	mountOptions.dataCenter = cmdMount.Flag.String("dataCenter", "", "prefer to write to the data center")
 	mountOptions.allowOthers = cmdMount.Flag.Bool("allowOthers", true, "allows other users to access the file system")
 	mountOptions.umaskString = cmdMount.Flag.String("umask", "022", "octal umask, e.g., 022, 0111")
diff --git a/weed/command/mount_std.go b/weed/command/mount_std.go
index 86c3e521e..f32d328b0 100644
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -225,9 +225,9 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		DiskType:           types.ToDiskType(*option.diskType),
 		ChunkSizeLimit:     int64(chunkSizeLimitMB) * 1024 * 1024,
 		ConcurrentWriters:  *option.concurrentWriters,
-		CacheDir:           *option.cacheDir,
-		CacheSizeMB:        *option.cacheSizeMB,
-		CacheDirWrite:      *option.cacheDirWrite,
+		CacheDirForRead:    *option.cacheDirForRead,
+		CacheSizeMBForRead: *option.cacheSizeMBForRead,
+		CacheDirForWrite:   *option.cacheDirForWrite,
 		DataCenter:         *option.dataCenter,
 		Quota:              int64(*option.collectionQuota) * 1024 * 1024,
 		MountUid:           uid,
diff --git a/weed/mount/dirty_pages_chunked.go b/weed/mount/dirty_pages_chunked.go
index 56c97549f..76a3be1be 100644
--- a/weed/mount/dirty_pages_chunked.go
+++ b/weed/mount/dirty_pages_chunked.go
@@ -29,7 +29,7 @@ func newMemoryChunkPages(fh *FileHandle, chunkSize int64) *ChunkedDirtyPages {
 		fh: fh,
 	}
 
-	swapFileDir := fh.wfs.option.getTempFilePageDir()
+	swapFileDir := fh.wfs.option.getUniqueCacheDirForWrite()
 
 	dirtyPages.uploadPipeline = page_writer.NewUploadPipeline(fh.wfs.concurrentWriters, chunkSize,
 		dirtyPages.saveChunkedFileIntervalToStorage, fh.wfs.option.ConcurrentWriters, swapFileDir)
diff --git a/weed/mount/weedfs.go b/weed/mount/weedfs.go
index 4e6bf80ab..458205366 100644
--- a/weed/mount/weedfs.go
+++ b/weed/mount/weedfs.go
@@ -38,9 +38,9 @@ type Option struct {
 	DiskType           types.DiskType
 	ChunkSizeLimit     int64
 	ConcurrentWriters  int
-	CacheDir           string
-	CacheSizeMB        int64
-	CacheDirWrite      string
+	CacheDirForRead    string
+	CacheSizeMBForRead int64
+	CacheDirForWrite   string
 	DataCenter         string
 	Umask              os.FileMode
 	Quota              int64
@@ -57,8 +57,8 @@ type Option struct {
 	Cipher             bool   // whether encrypt data on volume server
 	UidGidMapper       *meta_cache.UidGidMapper
 
-	uniqueCacheDir         string
-	uniqueCacheTempPageDir string
+	uniqueCacheDirForRead  string
+	uniqueCacheDirForWrite string
 }
 
 type WFS struct {
@@ -92,11 +92,11 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 
 	wfs.option.filerIndex = int32(rand.Intn(len(option.FilerAddresses)))
 	wfs.option.setupUniqueCacheDirectory()
-	if option.CacheSizeMB > 0 {
-		wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, option.getUniqueCacheDir(), option.CacheSizeMB, 1024*1024)
+	if option.CacheSizeMBForRead > 0 {
+		wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, option.getUniqueCacheDirForRead(), option.CacheSizeMBForRead, 1024*1024)
 	}
 
-	wfs.metaCache = meta_cache.NewMetaCache(path.Join(option.getUniqueCacheDir(), "meta"), option.UidGidMapper,
+	wfs.metaCache = meta_cache.NewMetaCache(path.Join(option.getUniqueCacheDirForRead(), "meta"), option.UidGidMapper,
 		util.FullPath(option.FilerMountRootPath),
 		func(path util.FullPath) {
 			wfs.inodeToPath.MarkChildrenCached(path)
@@ -106,8 +106,8 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 		})
 	grace.OnInterrupt(func() {
 		wfs.metaCache.Shutdown()
-		os.RemoveAll(option.getUniqueCacheDir())
-		os.RemoveAll(option.getTempFilePageDir())
+		os.RemoveAll(option.getUniqueCacheDirForRead())
+		os.RemoveAll(option.getUniqueCacheDirForWrite())
 	})
 
 	if wfs.option.ConcurrentWriters > 0 {
@@ -193,16 +193,16 @@ func (wfs *WFS) getCurrentFiler() pb.ServerAddress {
 
 func (option *Option) setupUniqueCacheDirectory() {
 	cacheUniqueId := util.Md5String([]byte(option.MountDirectory + string(option.FilerAddresses[0]) + option.FilerMountRootPath + util.Version()))[0:8]
-	option.uniqueCacheDir = path.Join(option.CacheDir, cacheUniqueId)
-	os.MkdirAll(option.uniqueCacheDir, os.FileMode(0777)&^option.Umask)
-	option.uniqueCacheTempPageDir = filepath.Join(path.Join(option.CacheDirWrite, cacheUniqueId), "swap")
-	os.MkdirAll(option.uniqueCacheTempPageDir, os.FileMode(0777)&^option.Umask)
+	option.uniqueCacheDirForRead = path.Join(option.CacheDirForRead, cacheUniqueId)
+	os.MkdirAll(option.uniqueCacheDirForRead, os.FileMode(0777)&^option.Umask)
+	option.uniqueCacheDirForWrite = filepath.Join(path.Join(option.CacheDirForWrite, cacheUniqueId), "swap")
+	os.MkdirAll(option.uniqueCacheDirForWrite, os.FileMode(0777)&^option.Umask)
 }
 
-func (option *Option) getTempFilePageDir() string {
-	return option.uniqueCacheTempPageDir
+func (option *Option) getUniqueCacheDirForWrite() string {
+	return option.uniqueCacheDirForWrite
 }
 
-func (option *Option) getUniqueCacheDir() string {
-	return option.uniqueCacheDir
+func (option *Option) getUniqueCacheDirForRead() string {
+	return option.uniqueCacheDirForRead
 }