[mythtv-users] semiOT: minor emergency, raid array's contents deleted

John Drescher drescherjm at gmail.com
Mon Dec 7 17:03:27 UTC 2009

On Mon, Dec 7, 2009 at 11:56 AM, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
> so here's a weird one...
> was watching some tv then shutdown my frontend, ssh'd into the backend
> and noticed that both my raid arrays are now "empty". the filesystems,
> which are JFS, check out as fine, but both, on seperate computers, are
> now both completely blank. absolutely no idea how this happened, but
> I'm hoping someone here has an idea as to what may have happened and
> if there is a way to recover all my lost data?

With linux software raid recovery is usually possible. I have not seen
a case where I could not recover and I run dozens of arrays at work.

Your description of the problem is very unclear.

can you post the output of

cat /proc/mdstat

Should look something like this:
 # cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sx8/1[0] sx8/4[4] sx8/3[3] sx8/5[2] sx8/2[1]
      976793600 blocks level 5, 256k chunk, algorithm 2 [5/5] [UUUUU]

md1 : active raid6 sx8/6[0] sx8/15[9] sx8/14[8] sx8/12[6] sx8/11[5]
sx8/10[4] sx8/9[3] sx8/8[2] sx8/7[1]
      1953587200 blocks level 6, 512k chunk, algorithm 2 [10/9] [UUUUUUU_UU]

unused devices: <none>

well without the bad drive. I am working on that at the minute. I have
to either wait till everyone goes home or reboot the server to remove
the 5 drives from md0 so that I can replace them with 6x1TB drives and
use one of the old 250GB SATA1 disks in md1..


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