I also sent this one to the linux-raid-ml, I am in trouble:
Sorry for maybe FAQing, I am in emergency mode:
customer server, RAID5 + hotspare, 4 drives ...
gentoo Linux version 2.6.25-gentoo-r7
mdadm 2.6.4-r1 here
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one of the 4 drives showed massive errors in dmesg, /dev/sdc
SMART-errors etc.
bought new drive and wanted to swap today.
# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4]
md1 : active raid1 sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
md3 : active raid5 sdb3[1] sda3[0]
19550976 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
md4 : inactive sdb4[1](S) sdd4[3](S) sdc4[2](S) sda4[0](S)
583641088 blocks
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I did:
mdadm /dev/md3 --fail /dev/sdc3
went OK
mdadm /dev/md4 --remove /dev/sdc3
OK as well, raid md3 rebuilt
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With md4 I was too aggressive maybe:
mdadm /dev/md4 --fail /dev/sdc4 --remove /dev/sdc4
this rendered md4 unusable, even after a reboot it can't be reassambled.
This is bad, to say the least.
md4 : inactive sdb4[1](S) sdd4[3](S) sdc4[2](S) sda4[0](S)
583641088 blocks
What to try?
This is a crucial server and I feel a lot of pressure.
Rebuilding that raid would mean a lot of restore-work etc.
So I would really appreciate a goo advice here.
THANKS!
Stefan
