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RAID構築したと思いきや、degradしていたとき。。　[LinuxでSoftware RAID]


# mdadm --create /dev/md0 --raid-devices=4 --level=raid10 -v /dev/sd[abcd]1


として、RAID10を構築をはじめて、、およそ５時間後、構築できたことを確認してみると。。


# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Sat May 15 05:54:27 2010
     Raid Level : raid10
     Array Size : 3907026944 (3726.03 GiB 4000.80 GB)
  Used Dev Size : 1953513472 (1863.02 GiB 2000.40 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sat May 15 10:53:31 2010
          State : active, degraded
 Active Devices : 2
Working Devices : 2
 Failed Devices : 2
  Spare Devices : 0

         Layout : near=2, far=1
     Chunk Size : 64K

           UUID : f2c36e62:2b9db247:86b54b3f:1d0c4af0 (local to host fs)
         Events : 0.21

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       0        0        1      removed
       2       8       33        2      active sync   /dev/sdc1
       3       0        0        3      removed

       4       8       49        -      faulty spare   /dev/sdd1
       5       8       17        -      faulty spare   /dev/sdb1


え〜。degradeしてるじゃないですか、って。。

いちおsyslogみると、

May 15 09:56:40 fs kernel: [16066.137942] end_request: I/O error, dev sdd, sector 2262970368
May 15 09:56:40 fs kernel: [16066.138010] raid10: Disk failure on sdd1, disabling device.
May 15 09:56:40 fs kernel: [16066.138013] raid10: Operation continuing on 3 devices.
May 15 09:56:40 fs kernel: [16066.138225] sd 5:0:0:0: [sdd] Unhandled error code
May 15 09:56:40 fs kernel: [16066.138228] sd 5:0:0:0: [sdd] Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT
May 15 09:56:40 fs kernel: [16066.138234] sd 5:0:0:0: [sdd] CDB: Write(10): 2a 00 86 e2 34 00
May 15 09:56:40 fs kernel: [16066.138244] md: md0: resync done.

あ〜、なんかイヤなかんじです。

# badblocks -vs -o sdb1.bad /dev/sdb1

# badblocks -vs -o sdd1.bad /dev/sdd1

で、不良セクタのチェックを行ってもいいのですが、時間が掛かりそうなので、
試しに、スーパーブロックを初期化して、リビルドします。


# mdadm --manage /dev/md0 --remove /dev/sd[bd]1
# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Sat May 15 05:54:27 2010
     Raid Level : raid10
     Array Size : 3907026944 (3726.03 GiB 4000.80 GB)
  Used Dev Size : 1953513472 (1863.02 GiB 2000.40 GB)
   Raid Devices : 4
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sat May 15 14:17:41 2010
          State : active, degraded
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

         Layout : near=2, far=1
     Chunk Size : 64K

           UUID : f2c36e62:2b9db247:86b54b3f:1d0c4af0 (local to host fs)
         Events : 0.23

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       0        0        1      removed
       2       8       33        2      active sync   /dev/sdc1
       3       0        0        3      removed


# mdadm --misc --zero-superblock /dev/sd[bd]1

# mdadm --manage /dev/md0 --add /dev/sd[bd]1

# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Sat May 15 05:54:27 2010
     Raid Level : raid10
     Array Size : 3907026944 (3726.03 GiB 4000.80 GB)
  Used Dev Size : 1953513472 (1863.02 GiB 2000.40 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sat May 15 14:18:28 2010
          State : active, degraded, recovering
 Active Devices : 2
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 2

         Layout : near=2, far=1
     Chunk Size : 64K

 Rebuild Status : 0% complete

           UUID : f2c36e62:2b9db247:86b54b3f:1d0c4af0 (local to host fs)
         Events : 0.25

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       5       8       17        1      spare rebuilding   /dev/sdb1
       2       8       33        2      active sync   /dev/sdc1
       3       0        0        3      removed

       4       8       49        -      spare   /dev/sdd1


って、リビルドって、一個ずつなのね（^^;）

５時間後。。

# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Sat May 15 05:54:27 2010
     Raid Level : raid10
     Array Size : 3907026944 (3726.03 GiB 4000.80 GB)
  Used Dev Size : 1953513472 (1863.02 GiB 2000.40 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sat May 15 19:47:59 2010
          State : active, degraded, recovering
 Active Devices : 3
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 1

         Layout : near=2, far=1
     Chunk Size : 64K

 Rebuild Status : 0% complete

           UUID : f2c36e62:2b9db247:86b54b3f:1d0c4af0 (local to host fs)
         Events : 0.42

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
       2       8       33        2      active sync   /dev/sdc1
       4       8       49        3      spare rebuilding   /dev/sdd1


さらに５時間後。

# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Sat May 15 05:54:27 2010
     Raid Level : raid10
     Array Size : 3907026944 (3726.03 GiB 4000.80 GB)
  Used Dev Size : 1953513472 (1863.02 GiB 2000.40 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sun May 16 01:21:37 2010
          State : active
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

         Layout : near=2, far=1
     Chunk Size : 64K

           UUID : f2c36e62:2b9db247:86b54b3f:1d0c4af0 (local to host fs)
         Events : 0.59

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
       2       8       33        2      active sync   /dev/sdc1
       3       8       49        3      active sync   /dev/sdd1


時間掛かったなぁ〜[たらーっ（汗）]

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