linux-ext4 - Re: large file system & high object count testing

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Date:	Mon, 31 Aug 2009 16:37:16 -0700
From:	Justin Maggard <jmaggard10@...il.com>
To:	Andreas Dilger <adilger@....com>
Cc:	Ric Wheeler <rwheeler@...hat.com>, linux-ext4@...r.kernel.org,
	"Ted Ts'o" <tytso@...nk.org>
Subject: Re: large file system & high object count testing

On Mon, Aug 31, 2009 at 4:13 PM, Andreas Dilger<adilger@....com> wrote:
> Justin, could you please replicate this corruption, collecting some
> additional information before & after.  My recollection is that the
> corruption appears in the first few groups, so 64kB should be plenty
> to capture the group descriptor tables (where the checksum is kept).
>
> - mke2fs
> - dd if=/dev/XXX bs=4k count=16 | gzip -9 > /tmp/gdt-new.gz
> - mkdir ...
> - sync
> - dd if=/dev/XXX bs=4k count=16 | gzip -9 > /tmp/gdt-mkdir.gz
> - umount
> - dd if=/dev/XXX bs=4k count=16 | gzip -9 > /tmp/gdt-umount.gz
> - e2fsck
> - dd if=/dev/XXX bs=4k count=16 | gzip -9 > /tmp/gdt-e2fsck.gz
>

No problem.  I just sent you an email with those four attached.  If
anyone would like me to upload them somewhere else, just let me know.

-Justin
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