linux-ext4 - Re: >16TB issues

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Message-ID: <20090828124013.GB16732@mit.edu>
Date:	Fri, 28 Aug 2009 08:40:13 -0400
From:	Theodore Tso <tytso@....edu>
To:	Justin Maggard <jmaggard10@...il.com>
Cc:	Valerie Aurora <vaurora@...hat.com>,
	Andreas Dilger <adilger@....com>, linux-ext4@...r.kernel.org,
	Nick Dokos <nicholas.dokos@...com>,
	Julia Lawall <julia@...u.dk>
Subject: Re: >16TB issues

On Thu, Aug 27, 2009 at 07:30:47PM -0700, Justin Maggard wrote:
> I've been testing the latest 64-bit e2fsprogs from the git pu branch
> (kernel.org 2.6.30.5/x86_64) on a 64-bit (~22TB) filesystem for a
> couple days, since it seems like 32-bit e2fsprogs on a 64-bit
> filesystem is going to take a while longer.  I'm able to create and
> check a filesystem without any problem.  I've also run Andreas'
> llverfs utility for a few hours and not had any complaints.  But, I'm
> running into another strange issue.  Here's what I'm doing:
> # mkfs.ext4 /dev/md0
> # mount /dev/md0 /mnt
> # mkdir /mnt/1 /mnt/2 /mnt/3 /mnt/4 /mnt/5
> # umount /mnt
> # fsck.ext4 -C0 -fy /dev/md0
> ** No errors at all at this point.  fsck returns 0. **
> # mount /dev/md0 /mnt
> The last mount command fails, and the kernel log contains:
> EXT4-fs: ext4_check_descriptors: Checksum for group 0 failed (3412!=9428)
> EXT4-fs: group descriptors corrupted!

Um, that's interesting.  What happens if run fsck.ext4 twice?  i.e:

# mkfs.ext4 /dev/md0
# mount /dev/md0 /mnt
# mkdir /mnt/1 /mnt/2 /mnt/3 /mnt/4 /mnt/5
# umount /mnt
# fsck.ext4 -C0 -fy /dev/md0
# fsck.ext4 -C0 -fy /dev/md0

						- Ted

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