linux-ext4 - RE: ext4 corruption on 17TB file system during power cycle test

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Message-ID: <2CE44BD3DBCF9541909CCB42F11CA392828B31@SFO1EXC-MBXP06.nbttech.com>
Date:	Wed, 13 Jun 2012 14:20:42 +0000
From:	Ming Lei <Ming.Lei@...erbed.com>
To:	Eric Sandeen <sandeen@...hat.com>
CC:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: RE: ext4 corruption on 17TB file system during power cycle test

If the bug is in e2fsck, then if I mount the ext4 fs and umount it before I do e2fsck, should fsck return no error? The journal replay would be done by kernel during mount, am I correct?

-----Original Message-----
From: Eric Sandeen [mailto:sandeen@...hat.com] 
Sent: Wednesday, June 13, 2012 7:11 AM
To: Ming Lei
Cc: linux-ext4@...r.kernel.org
Subject: Re: ext4 corruption on 17TB file system during power cycle test

On 6/13/12 8:49 AM, Ming Lei wrote:
> I  have raid0 on 12 Seagate new 3TB sas drives and kernel version is
> 2.6.32SL6.1 version. The ext4 is mounted with barrier on, delalloc 
> on/off has almost the same result.
> 
> I ran fs_mark -F -t 10 -D 1000 -N 1000 -n 1000000 -s 40 -S 2 into 4 
> iterations(reported count of 40000000) and then power cycled the box.
> After the box came up, I ran fsck -f to check inconsistency. On ext4 
> FS 7.5TB and 16TB, I got no fsck error; but on 17TB, 21TB and 33TB, I 
> got big chunk of fsck errors.
> 
> My question is: is this known issue and any fix?

What version of e2fsprogs?  That'd be the critical first question.

There was at least one log recovery fix that went in post-1.42.3:

commit 3b693d0b03569795d04920a04a0a21e5f64ffedc
Author: Theodore Ts'o <tytso@....edu>
Date:   Mon May 21 21:30:45 2012 -0400

    e2fsck: fix 64-bit journal support

    64-bit journal support was broken; we weren't using the high bits from
    the journal descriptor blocks!  We were also using "unsigned long" for
    the journal block numbers, which would be a problem on 32-bit systems.

    Signed-off-by: "Theodore Ts'o" <tytso@....edu>


1.42.4 was just released yesterday, you might retest that version.

-Eric
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