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Apr  2 15:10:38 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad1 detected.
Apr  2 15:10:38 ns2 kernel: GEOM_MIRROR: Device gm0: rebuilding provider ad1.
Apr  2 16:17:16 ns2 kernel: GEOM_MIRROR: Device gm0: rebuilding provider ad1 finished.
Apr  2 16:17:16 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad1 activated.

$gmirror status
      Name    Status  Components
mirror/gm0  COMPLETE  ad0
                                      ad1
пока что все хорошо....но я проверю еще через час. Прошлый раз могло повлиять на то что появился статус DEGRADED  еще то что когда был ребилд была перезагрузка сервере (до сех пор не могу понять чем она вызвана)

$cat /var/log/messages/messages |grep gm0
Apr  2 10:55:12 ns2 kernel: GEOM_MIRROR: Component ad1 (device gm0) broken, skipping.
Apr  2 10:55:12 ns2 kernel: GEOM_MIRROR: Cannot add disk ad1 to gm0 (error=22).
Apr  2 10:55:24 ns2 kernel: GEOM_MIRROR: Component ad1 (device gm0) broken, skipping.
Apr  2 10:55:24 ns2 kernel: GEOM_MIRROR: Cannot add disk ad1 to gm0 (error=22).
Apr  2 10:55:58 ns2 kernel: GEOM_MIRROR: Component ad1 (device gm0) broken, skipping.
Apr  2 10:55:58 ns2 kernel: GEOM_MIRROR: Cannot add disk ad1 to gm0 (error=22).
Apr  2 12:45:49 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad1 detected.
Apr  2 12:45:49 ns2 kernel: GEOM_MIRROR: Device gm0: rebuilding provider ad1.
Apr  2 13:08:37 ns2 kernel: GEOM_MIRROR: Device gm0 created (id=3702576076).
Apr  2 13:08:37 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad0 detected.
Apr  2 13:08:37 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad1 detected.
Apr  2 13:08:37 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad0 activated.
Apr  2 13:08:37 ns2 kernel: GEOM_MIRROR: Device gm0: provider mirror/gm0 launched.
Apr  2 13:08:37 ns2 kernel: GEOM_MIRROR: Device gm0: rebuilding provider ad1.
Apr  2 13:08:37 ns2 kernel: Trying to mount root from ufs:/dev/mirror/gm0s1a
Apr  2 13:10:35 ns2 fsck: /dev/mirror/gm0s1d: Reclaimed: 0 directories, -1 files, 0 fragments
Apr  2 13:10:35 ns2 fsck: /dev/mirror/gm0s1d: 1874 files, 249361 used, 1273142 free (366 frags, 159097 bloc            ks, 0.0% fragmentation)
Apr  2 13:22:38 ns2 fsck: /dev/mirror/gm0s1f: 243925 files, 1944673 used, 4170710 free (31862 frags, 517356             blocks, 0.5% fragmentation)
Apr  2 13:42:58 ns2 fsck: /dev/mirror/gm0s1e: INCORRECT BLOCK COUNT I=7749066 (3456 should be 3424) (CORREC            TED)
Apr  2 13:42:58 ns2 fsck: /dev/mirror/gm0s1e: UNREF FILE I=6900767  OWNER=root MODE=140666
Apr  2 13:42:58 ns2 fsck: /dev/mirror/gm0s1e: SIZE=0 MTIME=Mar 29 12:25 2009  (CLEARED)
Apr  2 13:42:58 ns2 fsck: /dev/mirror/gm0s1e: Reclaimed: 0 directories, 2 files, 24 fragments
Apr  2 13:42:58 ns2 fsck: /dev/mirror/gm0s1e: 85150 files, 35764517 used, 30246853 free (15973 frags, 37788            60 blocks, 0.0% fragmentation)
Apr  2 14:14:32 ns2 kernel: GEOM_MIRROR: Device gm0: rebuilding provider ad1 finished.
Apr  2 14:14:32 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad1 activated.
Apr  2 14:48:39 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad1 disconnected.
Apr  2 15:10:27 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad1 detected.
Apr  2 15:10:27 ns2 kernel: GEOM_MIRROR: Device gm0: rebuilding provider ad1.
Apr  2 15:10:38 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad1 disconnected.
Apr  2 15:10:38 ns2 kernel: GEOM_MIRROR: Device gm0: rebuilding provider ad1 stopped.
Apr  2 15:10:38 ns2 kernel: GEOM_MIRROR: Device gm0: provider ad1 detected.
Apr  2 15:10:38 ns2 kernel: GEOM_MIRROR: Device gm0: rebuilding provider ad1.
пробую вот снова
$gmirror status
      Name    Status  Components
mirror/gm0  DEGRADED  ad0
                      ad1 (49%)

#fsck -y /dev/ad0
fsck: Could not determine filesystem type
#swapinfo
Device          1K-blocks     Used    Avail Capacity
/dev/mirror/gm0s1b   3145728        4  3145724     0%

$gmirror insert gm0 /dev/ad0
Not all disks connected.

$gstat
dT: 0.501  flag_I 500000us  sizeof 240  i -1
L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w   %busy Name
    0      0      0      0    0.0      0      0    0.0    0.0| ad0
    0      0      0      0    0.0      0      0    0.0    0.0| ad1
    0      0      0      0    0.0      0      0    0.0    0.0| acd0
    0      0      0      0    0.0      0      0    0.0    0.0| ad1s1
    0      0      0      0    0.0      0      0    0.0    0.0| mirror/gm0
    0      0      0      0    0.0      0      0    0.0    0.0| ad1s1a
    0      0      0      0    0.0      0      0    0.0    0.0| ad1s1b
    0      0      0      0    0.0      0      0    0.0    0.0| ad1s1c
    0      0      0      0    0.0      0      0    0.0    0.0| ad1s1d
    0      0      0      0    0.0      0      0    0.0    0.0| mirror/gm0s1
    0      0      0      0    0.0      0      0    0.0    0.0| ad1s1e
    0      0      0      0    0.0      0      0    0.0    0.0| ad1s1f
    0      0      0      0    0.0      0      0    0.0    0.0| mirror/gm0s1a
    0      0      0      0    0.0      0      0    0.0    0.0| mirror/gm0s1b
    0      0      0      0    0.0      0      0    0.0    0.0| mirror/gm0s1c
    0      0      0      0    0.0      0      0    0.0    0.0| mirror/gm0s1d
    0      0      0      0    0.0      0      0    0.0    0.0| mirror/gm0s1e
    0      0      0      0    0.0      0      0    0.0    0.0| mirror/gm0s1f

l$fsck
** /dev/mirror/gm0s1a (NO WRITE)
** Last Mounted on /
** Root file system
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
2056 files, 102849 used, 403638 free (414 frags, 50403 blocks, 0.1% fragmentation)
** /dev/mirror/gm0s1d (NO WRITE)
** Last Mounted on /tmp
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
SUMMARY BLK COUNT(S) WRONG IN SUPERBLK
SALVAGE? no

1871 files, 249361 used, 1273142 free (366 frags, 159097 blocks, 0.0% fragmentation)
** /dev/mirror/gm0s1f (NO WRITE)
** Last Mounted on /usr
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
243924 files, 1944673 used, 4170710 free (31862 frags, 517356 blocks, 0.5% fragmentation)
** /dev/mirror/gm0s1e (NO WRITE)
** Last Mounted on /var
** Phase 1 - Check Blocks and Sizes
INCORRECT BLOCK COUNT I=7749022 (20928 should be 20896)
CORRECT? no

** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
UNREF FILE I=6900767  OWNER=root MODE=140666
SIZE=0 MTIME=Mar 29 12:25 2009
CLEAR? no

** Phase 5 - Check Cyl groups
FREE BLK COUNT(S) WRONG IN SUPERBLK
SALVAGE? no

SUMMARY INFORMATION BAD
SALVAGE? no

BLK(S) MISSING IN BIT MAPS
SALVAGE? no

$fsck_ffs -b 0 /dev/ad0
Alternate super block location: 0
** /dev/ad0
Cannot find file system superblock
ioctl (GCINFO): Inappropriate ioctl for device
fsck_ffs: /dev/ad0: can't read disk label
root@ns2:/home/unreal$fsck_ffs -b 0 /dev/ad1
Alternate super block location: 0
** /dev/ad1
Cannot find file system superblock
ioctl (GCINFO): Inappropriate ioctl for device
fsck_ffs: /dev/ad1: can't read disk label

$mount
/dev/mirror/gm0s1a on / (ufs, local)
devfs on /dev (devfs, local)
/dev/mirror/gm0s1d on /tmp (ufs, local, soft-updates)
/dev/mirror/gm0s1f on /usr (ufs, local, with quotas, soft-updates)
/dev/mirror/gm0s1e on /var (ufs, local, with quotas, soft-updates)
devfs on /var/named/dev (devfs, local)

$gmirror status
      Name    Status  Components
mirror/gm0  DEGRADED  ad0