[mythtv-users] Rebuild raid array ?

[Kevin Bailey]

Seasons greetings, all,

Long time, no see. I've been enjoying 0.22 so much that I fell off the
mailing list.
Now I'm trying to upgrade to 0.24 and ran into some (albeit non-mythtv)
trouble.
But I suspect others on the list have some experience here, so crossing my
fingers.

I figured it was also time to upgrade the server to Lucid. This appeared to
go ok.
When I rebooted, it refused to mount my RAID array. For reference, here's
what I have:

sda1: boot partition
sda2: RAID
sdb1: swap
sdb2: RAID
sdc1: swap
sdc2: RAID
sdd1: swap
sdd2: RAID

I booted from a Lucid CD, and ran mdadm --assemble /dev/md0, and it said:

mdadm: failed to add /dev/sda2 to /dev/md0: Device or resource busy
mdadm: /dev/md0 has been started with 3 drives (out of 4).

Looking at dmesg, it says:

[    5.975166] EXT3-fs (sda1): mounted filesystem with ordered data mode
[    6.044417] EXT3-fs error (device sda2): ext3_check_descriptors: Block
bitmap for group 1920 not in group (block 32832)!
[    6.044423] EXT3-fs (sda2): error: group descriptors corrupted
[    6.330151] EXT4-fs (sdd2): Couldn't mount because of unsupported
optional features (4000000)

/proc/mdstat says:

Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sda2[4] sdd2[3] sdc2[2] sdb2[1]
      729599808 blocks level 5, 64k chunk, algorithm 2 [4/3] [_UUU]
      [===================>.]  recovery = 99.0% (240874624/243199936)
finish=0.6min speed=56580K/sec

unused devices: <none>

At this point, I *could* just copy everything off and start from ground
zero,
but I think you all know what a pain in the back-end that would be, and
I have this tiny suspicion that there's something I could do to make
it happy again.

Would some kind soul suggest some things I could try to bring back my myth
server ?

Thanks!
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