My /dev/md0 array just died last night. I got this email
This is an automatically generated mail message from mdadm running on
A Fail event had been detected on md device /dev/md0.
It could be related to component device /dev/sdb.
Faithfully yours, etc.
P.S. The /proc/mdstat file currently contains the following:
Personalities : [raid6] [raid5] [raid4] md0 : active raid5 sdb0 sde sdd sdc1 4395411456 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/2] [__UU]
So, i had to pull the plug :(
After reboot, array failed to restart.
mdadm -A /dev/md0
mdadm: /dev/md0 assembled from 2 drives - not enough to start the array.
Personalities : md0 : inactive sdd(S) sde(S) sdc(S) sdb(S) 5860550240 blocks super 1.2 unused devices: <none>
mdadm --assemble --force --verbose /dev/md0 /dev/sdc /dev/sdb
mdadm: looking for devices for /dev/md0 mdadm: /dev/sdc is identified as a member of /dev/md0, slot 1. mdadm: /dev/sdb is identified as a member of /dev/md0, slot 0. mdadm: added /dev/sdc 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 0 mdadm: /dev/md0 assembled from 2 drives - not enough to start the array.