diff --git a/weed/command/mount_std.go b/weed/command/mount_std.go
index ce9a998f6..8514f18af 100644
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -175,7 +175,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		fuse.DefaultPermissions(),
 		fuse.MaxReadahead(1024 * 128),
 		fuse.AsyncRead(),
-		fuse.WritebackCache(),
+		// fuse.WritebackCache(),
 		fuse.MaxBackground(128),
 		fuse.CongestionThreshold(128),
 	}
diff --git a/weed/filesys/file.go b/weed/filesys/file.go
index bbc5c8e21..6cf52ba60 100644
--- a/weed/filesys/file.go
+++ b/weed/filesys/file.go
@@ -96,6 +96,7 @@ func (file *File) Getxattr(ctx context.Context, req *fuse.GetxattrRequest, resp
 func (file *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fs.Handle, error) {
 
 	glog.V(4).Infof("file %v open %+v", file.fullpath(), req)
+	resp.Flags |= fuse.OpenDirectIO
 
 	handle := file.wfs.AcquireHandle(file, req.Uid, req.Gid)