Now I mount cifs for every clients backup # mount //store/homes on /mnt/host type cifs (rw,mand) But there is still a problem: # ls /mnt/host -l total 4 drwxr-xr-x 4 10004 10004 0 Feb 28 14:11 fs_backup this UID 10004 exists on the samba server 'store', but for this client, it's not good to use this UID, I hope that the files and dirs are all owned by 'root'. What should I do? Thank you.