linux-ext4 - Re: ext4 corruption on md [7x1TB in RAID5]

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Date:	Sat, 09 May 2009 12:56:15 -0600
From:	Andreas Dilger <adilger@....com>
To:	Don Bowman <don@...dvine.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: ext4 corruption on md [7x1TB in RAID5]

On May 09, 2009  14:36 -0400, Don Bowman wrote:
> To follow my own email, the results of the 'findsuper' program are:
> 
> starting at 0, with 512 byte increments
> byte_offset  byte_start       byte_end   fs_blocks blksz  grp last_mount_time           sb_uuid label
>        1024           0  6001228775424  1465143744  4096    0  Wed Apr 22 19:04:50 2009 52e18bf7
>   134217728           0  6001228775424  1465143744  4096    1  Wed Apr 22 19:04:50 2009 52e18bf7
>   402653184           0  6001228775424  1465143744  4096    3  Wed Apr 22 19:04:50 2009 52e18bf7
>   671088640           0  6001228775424  1465143744  4096    5  Wed Apr 22 19:04:50 2009 52e18bf7
>   939524096           0  6001228775424  1465143744  4096    7  Wed Apr 22 19:04:50 2009 52e18bf7
>  1207959552           0  6001228775424  1465143744  4096    9  Wed Apr 22 19:04:50 2009 52e18bf7
>  3355443200           0  6001228775424  1465143744  4096   25  Wed Apr 22 19:04:50 2009 52e18bf7
>  3623878656           0  6001228775424  1465143744  4096   27  Wed Apr 22 19:04:50 2009 52e18bf7
>  6576668672           0  6001228775424  1465143744  4096   49  Wed Apr 22 19:04:50 2009 52e18bf7
> 10871635968           0  6001228775424  1465143744  4096   81  Wed Apr 22 19:04:50 2009 52e18bf7
> 16777216000           0  6001228775424  1465143744  4096  125  Wed Apr 22 19:04:50 2009 52e18bf7
> 32614907904           0  6001228775424  1465143744  4096  243  Wed Apr 22 19:04:50 2009 52e18bf7
> 46036680704           0  6001228775424  1465143744  4096  343  Wed Apr 22 19:04:50 2009 52e18bf7
> 83886080000           0  6001228775424  1465143744  4096  625  Wed Apr 22 19:04:50 2009 52e18bf7
> 97844723712           0  6001228775424  1465143744  4096  729  Wed Apr 22 19:04:50 2009 52e18bf7
>  ... [still going]
> 
> Can this help me somehow?

These are all showing available backup superblocks and group descriptors.
Pick one of the "grp" numbers and use that as the argument for "-b" per
my previous email:  "e2fsck -f -b $((729 * 32768)) -B 4096 /dev/XXX".
A backup first is still a good idea, however.

Note that this appears to be a bug that has been hit by several Ubuntu
users.  I would suggest to upgrade to the latest vanilla kernel (at
least 2.6.29.stable, search the archives for details), which has fixed
it for many users.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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