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Date: Fri, 30 Mar 2012 10:03:17 +1100
From: Dave Chinner <david@fromorbit.com>
Subject: Re: Buffalo LS-Q4.0 Raid 5 XFS errors
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To: Kirk Anderson <kirkande@tx.rr.com>
Cc: xfs@oss.sgi.com

On Thu, Mar 29, 2012 at 05:15:08PM -0500, Kirk Anderson wrote:
> Thank you again for your help.  Please let me know what my next step should
> be.
> 
> Here is the output from the dd command.  My understanding is that I use the
> /dev/sd[a-d]6 for mine as the  cat /proc/mdstat indicated that 
> md2 : active raid5 sda6[0] sdd6[3] sdc6[2] sdb6[1]
>       2906278656 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
> 
> root@LS-QLF55:~# dd if=/dev/sda6 bs=512 count=1 2> /dev/null | hexdump -C
> 00000000  58 46 53 42 00 00 10 00  00 00 00 00 2b 4e 92 c0 |XFSB........+N..|
.....

Ok, so that's a superblock. Does it match the output of

# dd if=/dev/md2 bs=512 count=1 2> /dev/null | hexdump -C

It should match according to the above, but it doesn't hurt to
confirm.  If it doesn't then your RAID device has been SBTW and
that's what you need to fix first.

If it does match, can you dump the output of

# dd if=/dev/md2 bs=512 count=4 2> /dev/null | hexdump -C

and

# xfs_db -c "sb 0" -c p -c "agf 0" -c p -c "agi 0" -c p /dev/md2

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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