linux-ext4 - Re: fsck.ext4: Group descriptors look bad... trying backup blocks...

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Date:	Mon, 20 Apr 2009 12:28:00 -0600
From:	Andreas Dilger <adilger@....com>
To:	Jeremy Sanders <jss@....cam.ac.uk>
Cc:	Eric Sandeen <sandeen@...hat.com>, Theodore Tso <tytso@....edu>,
	linux-ext4@...r.kernel.org
Subject: Re: fsck.ext4: Group descriptors look bad... trying backup	blocks...

On Apr 20, 2009  16:53 +0100, Jeremy Sanders wrote:
> On Mon, 20 Apr 2009, Eric Sandeen wrote:
>> Eric Sandeen wrote:
>>> Theodore Tso wrote:
>>>> On Mon, Apr 20, 2009 at 12:43:37PM +0100, Jeremy Sanders wrote:
>>>>> It takes a day or two to do the sync. I've only done it twice (one with
>>>>> the old kernel, once with the new fedora testing kernel) and it happened
>>>>> both times. I'm afraid the statistics are rather low number here.
>>>>>
>>>>> I did a different faster test (just copying my home directory lots of
>>>>> times), but I wasn't able to get it to fail. That test didn't use much
>>>>> disk space, however. Maybe it's worth just dd'ing a few TB of data onto
>>>>> the device and seeing whether that fails.
>>>>>
>>>>> I didn't reboot this time - I did last time. I just unmounted the file
>>>>> system and fsckd it. The filesystem is 8.2TB and the data is around
>>>>> 2.5TB.
>>>
>>> I think trying a filesystem with just under 8T would be a useful test too.
>>
>> One other question - do you make use of xattrs on this filesystem?
>
> No.

If you use anything like SELinux or ACLs you would also (indirectly) be
using xattrs.

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

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