Hi there: Need some help here. OS: standard RedHat6.1, raid level: raid1 /etc]# raidhotadd /dev/md0 /dev/hdc7 trying to hot-add [dev 16:07] to md0 ... blkdev_open() failed: -19 md: could not lock [dev 16:07], zero-size? Marking faulty. md: error, md_import_device() returned -22 /dev/md0: can not hot-add disk: invalid argument. Any help is appreciated. J. ------------------------------------------------------- cat /proc/mdstat Personalities : [raid1] read_ahead 1024 sectors md0 : active raid1 hda7[1] 513984 blocks [2/1] [_U] md1 : active raid1 hda8[1] 513984 blocks [2/1] [_U] md2 : active raid1 hda9[1] 256896 blocks [2/1] [_U] unused devices: <none> ---------------------------------------------------- cat /etc/raidtab # 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/hda7 raid-disk 0 device /dev/hdc7 raid-disk 1 raiddev /dev/md1 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 chunk-size 4 persistent-superblock 1 device /dev/hda8 raid-disk 0 device /dev/hdc8 raid-disk 1 raiddev /dev/md2 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 chunk-size 4 persistent-superblock 1 device /dev/hda9 raid-disk 0 device /dev/hdc9 raid-disk 1 ----------------------------------------------------- # df Filesystem 1k-blocks Used Available Use% Mounted on /dev/hda11 248895 44783 191262 19% / /dev/md1 497765 2370 469696 1% /etc_mrr /dev/hda1 23302 3336 18763 15% /boot /dev/hda6 497829 42283 429844 9% /home /dev/hda5 497829 323993 148134 69% /usr /dev/md2 248783 11047 224892 5% /var __________________________________________________ Do You Yahoo!? Kick off your party with Yahoo! Invites. http://invites.yahoo.com/