Hi there: mkraid --really-force /dev/md0 raidhotadd /dev/md0 /dev/hda7 ; After raidhotadd, sometimes it doesn't sync ; But if I reboot, it will start sync'ing. Does anyone know why? Thanks. J. cat /proc/mdstat Personalities : [raid1] read_ahead 1024 sectors md0 : active raid1 hda7[2] hdc7[0] 513984 blocks [2/1] [U_] unused devices: <none> --------------------------------------------------- # Config file for raid-1 device. raiddev /dev/md0 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 chunk-size 4 persistent-superblock 1 device /dev/hdc7 raid-disk 0 device /dev/hda7 failed-disk 1 --------------------------------------------------- __________________________________________________ Do You Yahoo!? Send online invitations with Yahoo! Invites. http://invites.yahoo.com