linux-ext4 - Re: >16TB issues

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Date:	Tue, 21 Jul 2009 10:10:18 -0600
From:	Andreas Dilger <adilger@....com>
To:	Justin Maggard <jmaggard10@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: >16TB issues

On Jul 16, 2009  11:04 -0700, Justin Maggard wrote:
> On Fri, Jul 3, 2009 at 7:38 AM, Andreas Dilger<adilger@....com> wrote:
> >> -  Immediately running e2fsck on the volume before ever mounting it
> >> will not complete, and results in the following:
> >> # e2fsck -n /dev/md2
> >> e2fsck 1.41.7 (29-June-2009)
> >> Error reading block 2435874816 (Attempt to read block from filesystem
> >> resulted in short read).  Ignore error? no
> 
> Error reading block 576192512 (Attempt to read block from filesystem
> resulted in short read) while reading inode and block bitmaps.  Ignore
> error? no
> 
> e2fsck: Can't read an block bitmap while retrying to read bitmaps for /dev/md2
> e2fsck: aborted

What is very strange here is that the block numbers being reported as
having read errors are not even beyond the 16TB limit.  Assuming 4kB blocks:

576192512 * 4kB = 2304770048kB = 2198GB

Are there error messages in syslog/dmesg when this happens?

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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