Re: ext4 corruption on 17TB file system during power cycle test

[Eric Sandeen <sandeen@redhat.com>]

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@mit.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@mit.edu>


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

-Eric