linux-ext4 - Re: 32TB ext4 fsck times

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Message-ID: <20090423151426.GC8476@shell>
Date:	Thu, 23 Apr 2009 11:14:26 -0400
From:	Valerie Aurora Henson <vaurora@...hat.com>
To:	Nick Dokos <nicholas.dokos@...com>
Cc:	Ric Wheeler <rwheeler@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: 32TB ext4 fsck times

On Thu, Apr 23, 2009 at 02:01:16AM -0400, Nick Dokos wrote:
> Valerie Aurora Henson <vaurora@...hat.com> wrote:
> 
> > Back to something useful the short term... Was the file system created
> > with uninitialized block groups and lazy inode table initialization?
> > 
> 
> Uninit_bg was on but lazy inode table initialization was off.  I tried
> turning lazy_itable_init on but e2fsck gets tons of errors, starting
> with group descriptor checksum errors.  Unfortunately, I now get group
> descriptor checksum errors even without lazy_itable_init and I 'm not
> sure why. So I'm back to debugging mke2fs/e2fsck.

I ran into a few heisenbugs when I was working on this, and there's
still that one failing test.  I did track down the commit that started
it, it was:

commit de119e26eb2cf041a8365994dc3a32efc080682e
Author: Valerie Aurora Henson <vaurora@...hat.com>
Date:   Tue Feb 3 13:15:19 2009 -0800

    e2fsck: Miscellaneous e2fsck-related 64-bit fixes.

    With this change, e2fsck runs to completion on a minimal 33-bit file system.

    Signed-off-by: Valerie Aurora Henson <vaurora@...hat.com>
    Signed-off-by: "Theodore Ts'o" <tytso@....edu>

I might take a look at the problem with the block group descriptors
and lazy itables; that was some crazy^Wcomplex code.

-VAL
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