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I have a software RAID 10 (jfs) on an ubuntu 12.10 and require some assistance repairing the RAID after it failed to mount after a routine apt-get upgrade followed by a reboot.
/dev/md0:
Version : 1.2
Creation Time : Mon Jan 7 20:42:27 2013
Raid Level : raid10
Array Size : 3904809984 (3723.92 GiB 3998.53 GB)
Used Dev Size : 1952404992 (1861.96 GiB 1999.26 GB)
Raid Devices : 4
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Mon Mar 18 19:34:08 2013
State : active, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 512K
Name : bert-serer:0 (local to host bert-serer)
UUID : 56fe0043:180dcd27:4760f54f:f77af72e
Events : 202109
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
2 0 0 2 removed
3 8 50 3 active sync /dev/sdd2
bertsisterwanda
Posted 2013-03-18T19:43:29.397
Reputation: 51
would booting from a live disk and then trying to reassemble the array work. mdadm --assemble --force /dev/md0 /dev/sd[abcd]2 – bertsisterwanda – 2013-03-18T20:06:24.733
Why would you need to boot from a live disk, rather then issue the command from your active install ? – davidgo – 2013-03-18T21:58:41.197
I need to un mount the disk first and as my boot in on that drive, the drive is busy. – bertsisterwanda – 2013-03-19T09:03:58.877