如何重新激活MDADM RAID5阵列?
我刚刚搬了家,这涉及到拆卸我的服务器并重新连接它。在这样做之后,我的一个MDADM RAID5阵列显示为非活动状态:
root@mserver:/tmp# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md1 : active raid5 sdc1[1] sdh1[2] sdg1[0]
3907023872 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
md0 : inactive sdd1[0](S) sdf1[3](S) sde1[2](S) sdb1[1](S)
3907039744 blocks
unused devices: <none>
在我看来,它似乎找到了所有的磁盘,但出于某种原因不想使用它们。
那么这些(S)标签是什么意思呢,我怎样才能告诉MDADM重新开始使用磁盘阵列呢?
[编辑]我刚刚尝试用-v
停止并组装数组。
root@mserver:~# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
root@mserver:~# mdadm --assemble --scan -v
mdadm: /dev/sde1 is identified as a member of /dev/md0, slot 2.
mdadm: /dev/sdf1 is identified as a member of /dev/md0, slot 3.
mdadm: /dev/sdd1 is identified as a member of /dev/md0, slot 0.
mdadm: /dev/sdb1 is identified as a member of /dev/md0, slot 1.
mdadm: added /dev/sdd1 to /dev/md0 as 0 (possibly out of date)
mdadm: added /dev/sdb1 to /dev/md0 as 1 (possibly out of date)
mdadm: added /dev/sdf1 to /dev/md0 as 3 (possibly out of date)
mdadm: added /dev/sde1 to /dev/md0 as 2
mdadm: /dev/md0 assembled from 1 drive - not enough to start the array.
…输入猫/proc/mdstat
看起来没有什么不同。
[编辑2]不知道是否有帮助,但这是检查每个磁盘的结果。
root@mserver:~# mdadm –examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.00
UUID : 2f331560:fc85feff:5457a8c1:6e047c67 (local to host mserver)
Creation Time : Sun Feb 1 20:53:39 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Sat Apr 20 13:22:27 2013
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : 6c8f71a3 - correct
Events : 955190
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 17 1 active sync /dev/sdb1
0 0 8 113 0 active sync /dev/sdh1
1 1 8 17 1 active sync /dev/sdb1
2 2 8 97 2 active sync /dev/sdg1
3 3 8 33 3 active sync /dev/sdc1
root@mserver:~# mdadm –examine /dev/sdd1
/dev/sdd1:
Magic : a92b4efc
Version : 0.90.00
UUID : 2f331560:fc85feff:5457a8c1:6e047c67 (local to host mserver)
Creation Time : Sun Feb 1 20:53:39 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 2
Preferred Minor : 0
Update Time : Sat Apr 20 18:37:23 2013
State : active
Active Devices : 2
Working Devices : 2
Failed Devices : 2
Spare Devices : 0
Checksum : 6c812869 - correct
Events : 955205
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 113 0 active sync /dev/sdh1
0 0 8 113 0 active sync /dev/sdh1
1 1 0 0 1 faulty removed
2 2 8 97 2 active sync /dev/sdg1
3 3 0 0 3 faulty removed
root@mserver: ~# mdadm –examine /dev/sde1
/dev/sde1:
Magic : a92b4efc
Version : 0.90.00
UUID : 2f331560:fc85feff:5457a8c1:6e047c67 (local to host mserver)
Creation Time : Sun Feb 1 20:53:39 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 2
Preferred Minor : 0
Update Time : Sun Apr 21 14:00:43 2013
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 2
Spare Devices : 0
Checksum : 6c90cc70 - correct
Events : 955219
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 97 2 active sync /dev/sdg1
0 0 0 0 0 removed
1 1 0 0 1 faulty removed
2 2 8 97 2 active sync /dev/sdg1
3 3 0 0 3 faulty removed
root@mserver:~# mdadm –examine /dev/sdf1
/dev/sdf1:
Magic : a92b4efc
Version : 0.90.00
UUID : 2f331560:fc85feff:5457a8c1:6e047c67 (local to host mserver)
Creation Time : Sun Feb 1 20:53:39 2009
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Sat Apr 20 13:22:27 2013
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : 6c8f71b7 - correct
Events : 955190
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 33 3 active sync /dev/sdc1
0 0 8 113 0 active sync /dev/sdh1
1 1 8 17 1 active sync /dev/sdb1
2 2 8 97 2 active sync /dev/sdg1
3 3 8 33 3 active sync /dev/sdc1
我有一些笔记,表明硬盘最初的组装情况如下。
md0 : active raid5 sdb1[1] sdc1[3] sdh1[0] sdg1[2]
2930279808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
[编辑3]
通过查看日志,似乎发生了以下情况(根据Update Time
结果中的--examine
):
- sdb和sdf在20日13:22之后的某个时间被淘汰,
- sdd在20日18:37之后的某个时间被淘汰,
- 服务器在第1次
14:00之后的某个时间被关闭,鉴于两块磁盘同时宕机(显然),我想应该可以合理安全地假设阵列在那之后不会被写入(?用什么命令最安全,有没有办法在不写任何变化的情况下做到这一点?