Linux RAID10 在重新同步時遇到壞盤。是軟管嗎？

我在 md0 上有一個 Linux 軟體 RAID10 設備。它由 4 個 1TB 磁碟組成

$$ abcd $$. 昨天 Smart 給我發電子郵件說磁碟壞了（查找錯誤並重新分配扇區）。我使用新驅動器重新啟動並將其添加到陣列中。/proc/mdstat 顯示它正在重新同步。上午的某個時候，由於陣列中另一個磁碟上的“媒體錯誤”而出現錯誤。我檢查了 /var/log/messages 並看到同一陣列中另一個驅動器的大量*Emask 0x49（媒體錯誤）*條目。謝謝墨菲。 我更換了新出現故障的驅動器，但沒有運氣啟動陣列。mdadm 還告訴我 sdc 很忙。有誰知道為什麼？這是最新的驅動器：

   # mdadm  -S /dev/md0
   mdadm: stopped /dev/md0

   # mdadm --assemble /dev/md0 /dev/sda /dev/sdb /dev/sdc /dev/sdd -fv
   mdadm: looking for devices for /dev/md0
   mdadm: /dev/sda is identified as a member of /dev/md0, slot 1.
   mdadm: /dev/sdb is identified as a member of /dev/md0, slot -1.
   mdadm: /dev/sdc is identified as a member of /dev/md0, slot -1.
   mdadm: /dev/sdd is identified as a member of /dev/md0, slot 0.
   mdadm: added /dev/sda to /dev/md0 as 1
   mdadm: no uptodate device for slot 2 of /dev/md0
   mdadm: no uptodate device for slot 3 of /dev/md0
   mdadm: added /dev/sdb to /dev/md0 as -1
   mdadm: failed to add /dev/sdc to /dev/md0: Device or resource busy
   mdadm: added /dev/sdd to /dev/md0 as 0
   mdadm: /dev/md0 assembled from 2 drives and 1 spare - not enough to start the array.

# cat /proc/mdstat 
Personalities : [raid10] 
md0 : inactive sdd[4](S) sdb[6](S) sda[5](S)
     2930287104 blocks super 1.0

unused devices: <none>

# for d in a b c d; do mdadm -E /dev/sd$d; done
/dev/sda:
         Magic : a92b4efc
       Version : 1.0
   Feature Map : 0x0
    Array UUID : 24edfbfb:f97149e1:93e019e7:fc7b3f03
          Name : bach:0
 Creation Time : Thu Sep 30 13:50:40 2010
    Raid Level : raid10
  Raid Devices : 4

Avail Dev Size : 1953524896 (931.51 GiB 1000.20 GB)
    Array Size : 3907049472 (1863.03 GiB 2000.41 GB)
 Used Dev Size : 1953524736 (931.51 GiB 1000.20 GB)
  Super Offset : 1953525152 sectors
         State : clean
   Device UUID : fc75bc5b:e32851bb:9725e0ce:aeaa1680

   Update Time : Thu Dec 27 09:28:13 2012
      Checksum : 3a03b8e1 - correct
        Events : 7314

        Layout : near=1, far=2
    Chunk Size : 256K

   Array Slot : 5 (failed, failed, failed, failed, 0, 1, failed)
  Array State : uU__ 5 failed


/dev/sdb:
         Magic : a92b4efc
       Version : 1.0
   Feature Map : 0x0
    Array UUID : 24edfbfb:f97149e1:93e019e7:fc7b3f03
          Name : bach:0
 Creation Time : Thu Sep 30 13:50:40 2010
    Raid Level : raid10
  Raid Devices : 4

Avail Dev Size : 1953524896 (931.51 GiB 1000.20 GB)
    Array Size : 3907049472 (1863.03 GiB 2000.41 GB)
 Used Dev Size : 1953524736 (931.51 GiB 1000.20 GB)
  Super Offset : 1953525152 sectors
         State : clean
   Device UUID : adbb2437:931c08fc:0e5428b8:a6d0d47d

   Update Time : Thu Dec 27 09:28:13 2012
      Checksum : 3d2946ab - correct
        Events : 7306

        Layout : near=1, far=2
    Chunk Size : 256K

   Array Slot : 6 (failed, failed, failed, failed, 0, 1)
  Array State : uu__ 4 failed


/dev/sdc:
         Magic : a92b4efc
       Version : 1.0
   Feature Map : 0x0
    Array UUID : 24edfbfb:f97149e1:93e019e7:fc7b3f03
          Name : bach:0
 Creation Time : Thu Sep 30 13:50:40 2010
    Raid Level : raid10
  Raid Devices : 4

Avail Dev Size : 1953524896 (931.51 GiB 1000.20 GB)
    Array Size : 3907049472 (1863.03 GiB 2000.41 GB)
 Used Dev Size : 1953524736 (931.51 GiB 1000.20 GB)
  Super Offset : 1953525152 sectors
         State : clean
   Device UUID : 5c216a06:c17d4e4f:9dc5c09b:b3f7d72f

   Update Time : Thu Dec 27 09:28:13 2012
      Checksum : f5508998 - correct
        Events : 0

        Layout : near=1, far=2
    Chunk Size : 256K

   Array Slot : 6 (failed, failed, failed, failed, 0, 1)
  Array State : uu__ 4 failed


/dev/sdd:
         Magic : a92b4efc
       Version : 1.0
   Feature Map : 0x0
    Array UUID : 24edfbfb:f97149e1:93e019e7:fc7b3f03
          Name : bach:0
 Creation Time : Thu Sep 30 13:50:40 2010
    Raid Level : raid10
  Raid Devices : 4

Avail Dev Size : 1953524896 (931.51 GiB 1000.20 GB)
    Array Size : 3907049472 (1863.03 GiB 2000.41 GB)
 Used Dev Size : 1953524736 (931.51 GiB 1000.20 GB)
  Super Offset : 1953525152 sectors
         State : clean
   Device UUID : 69a39c8f:0b25b888:0b4e1848:42aed006

   Update Time : Thu Dec 27 09:28:13 2012
      Checksum : 3b3d0e7c - correct
        Events : 7314

        Layout : near=1, far=2
    Chunk Size : 256K

   Array Slot : 4 (failed, failed, failed, failed, 0, 1, failed)
  Array State : Uu__ 5 failed

我有陣列的備份，但要恢復一整天。有什麼辦法讓這個東西上網嗎？

好吧，作為最後一次嘗試，我嘗試使用新出現的故障磁碟和 mdadm--assume-clean選項重新創建陣列，看看它會做什麼。它出現了，但沒有找到任何數據。嗯嗯.. 是的備份。

引用自：https://serverfault.com/questions/461400