_ [サーバ][運用][管理] SATAケーブル抜いて縮退モードを試してみた。

SATAケーブルを抜いても、再起動後に片方のHDDでOSが動作するのを確認できました。それでケーブルを元に戻してみたけど自動回復しませんでした。縮退モードになったままなのでmdadmコマンドで再構築。mdadmはRAID環境を構築しない限り使わないコマンドなので、ちょっと勉強してみようと思います。

[root@xx samba]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1]
      104320 blocks [2/1] [_U]
md1 : active raid1 sdb3[1] sda3[0]
      2040128 blocks [2/2] [UU]
md2 : active raid1 sdb2[1]
      974615232 blocks [2/1] [_U]
[root@xx samba]# mdadm --detail /dev/md2
/dev/md2:
        Version : 00.90.03
  Creation Time : Tue Dec 30 07:05:18 2008
     Raid Level : raid1
     Array Size : 974615232 (929.47 GiB 998.01 GB)
  Used Dev Size : 974615232 (929.47 GiB 998.01 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 2
    Persistence : Superblock is persistent
    Update Time : Tue Dec 30 12:55:59 2008
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0
           UUID : e11b7f72:d72e8389:6d04d614:d721b971
         Events : 0.12072
    Number   Major   Minor   RaidDevice State
       0       0        0        0      removed
       1       8       18        1      active sync   /dev/sdb2
[root@xx samba]# mdadm /dev/md2 --add /dev/sda2
mdadm: re-added /dev/sda2
[root@xx samba]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0] sdb1[1]
      104320 blocks [2/2] [UU]
md1 : active raid1 sdb3[1] sda3[0]
      2040128 blocks [2/2] [UU]
md2 : active raid1 sda2[2] sdb2[1]
      974615232 blocks [2/1] [_U]
      [>....................]  recovery =  0.4% (4172032/974615232) finish=216.1min speed=74826K/sec
[root@sc samba]# mdadm --detail /dev/md2
/dev/md2:
        Version : 00.90.03
  Creation Time : Tue Dec 30 07:05:18 2008
     Raid Level : raid1
     Array Size : 974615232 (929.47 GiB 998.01 GB)
  Used Dev Size : 974615232 (929.47 GiB 998.01 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 2
    Persistence : Superblock is persistent
    Update Time : Tue Dec 30 12:57:37 2008
          State : active, degraded, recovering
 Active Devices : 1
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 1
 Rebuild Status : 0% complete
           UUID : e11b7f72:d72e8389:6d04d614:d721b971
         Events : 0.12101
    Number   Major   Minor   RaidDevice State
       2       8        2        0      spare rebuilding   /dev/sda2
       1       8       18        1      active sync   /dev/sdb2