我在 md0 上有一个 Linux 软件 RAID10 设备。它由 4 个 1TB 磁盘 sd[abcd] 组成。昨天 Smart 给我发了一封电子邮件，说一个磁盘出了问题（寻道错误增加并重新分配扇区）。我重新启动了一个新驱动器并将其添加到阵列中。/proc/mdstat 显示它正在重新同步。上午某个时候，阵列中另一个磁盘上开始出现“介质错误”的错误。我检查了 /var/log/messages，看到大量Emask 0x49（媒体错误）同一阵列中另一个驱动器的条目。谢谢 Murphy。
我更换了新近发生故障的驱动器，但无法启动阵列。mdadm 还告诉我 sdc 很忙。有人知道为什么吗？这是最新的驱动器：
# 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
我已经备份了阵列，但恢复需要一整天的时间。有什么办法可以把这个东西放到网上吗？
答案1
好吧，作为最后的尝试，我尝试使用新故障的磁盘和 mdadm 选项重新创建阵列，--assume-clean看看它会做什么。它出现了，但没有找到数据。嗯，好吧……备份真棒。