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Date:	Fri, 14 Nov 2008 03:36:02 -0700
From:	Andreas Dilger <>
To:	Kelly Kane <>
Subject: Re: Call traces on console from a test machine

On Nov 13, 2008  18:16 -0800, Kelly Kane wrote:
> In the mean time, fsck.ext4 is not liking our filesystem.
> Group descriptor 353 checksum is invalid.  Fix? yes
> Pass 2: CheckingEntry 'spice-and-wolf-si-tendra-segunda-temporada' in
> /liamsito1234/ 
> (2152305) references inode
>                2901322 in group 354 where _INODE_UNINIT is set.
> Entry 'spice-and-wolf-si-tendra-segunda-temporada' in
> /liamsito1234/ 
> (2152305) has
>                deleted/unused inode 2901322.  Clear? yes
> /dev/sdb1: e2fsck canceled.
> e2fsck: aborted
> Same block group each run through, different inode.
> I ran e2image and produced the following file:
> Unfortunately I cannot mount the filesystem right now due to:
> EXT4-fs: ext4_check_descriptors: Checksum for group 353 failed  
> (23397!=52411)
> EXT4-fs: group descriptors corrupted!
> mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
>        missing codepage or other error       In some cases useful info  
> is found in syslog - try
>        dmesg | tail  or so
> Is there any hope for recovery of any of this data?

You can run "tune2fs -O ^uninit_bg /dev/XXX" to disable the group
descriptor checksums (and, unfortunately, the fast fsck benefits),
but at least it will allow you to mount the filesystem.

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

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