I managed to mess up a RAID-5 array by mdadm -adding a few failed disks
back, trying to get the array running again. Unfortunately, -add didn't do
what I expected, but instead made spares out of the failed disks. The
disks failed due to loose SATA cabling and the data inside should be
fairly consistent. sdh failed a bit earlier than sdd and sde, so I expect
to be able to revocer by building a degraded array without sdh and then
syncing.
The current situation looks like this:
Number Major Minor RaidDevice State
0 0 8 33 0 active sync /dev/sdc1
1 1 0 0 1 faulty removed
2 2 8 97 2 active sync /dev/sdg1
3 3 8 129 3 active sync /dev/sdi1
4 4 0 0 4 faulty removed
5 5 8 81 5 active sync /dev/sdf1
6 6 0 0 6 faulty removed
7 7 8 177 7 spare
8 8 8 161 8 spare
9 9 8 145 9 spare
... and before any of this happened, the configuration was:
disk 0, o:1, dev:sdc1
disk 1, o:1, dev:sde1
disk 2, o:1, dev:sdg1
disk 3, o:1, dev:sdi1
disk 4, o:1, dev:sdh1
disk 5, o:1, dev:sdf1
disk 6, o:1, dev:sdd1
I gather that I need a way to alter the superblocks of sde and sdd so that
they seem to be clean up-to-date disks, with their original disk numbers 1
and 6. A hex editor comes to mind, but are there any better tools for that?
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