From: Goswin von Brederlow <goswin-v-b@web.de>
Subject: Re: ext4 64bit (disk >16TB) question
Date: Wed, 16 Jul 2008 12:10:31 +0200
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Cc: Andreas Dilger <adilger@sun.com>,
	Goswin von Brederlow <goswin-v-b@web.de>,
	linux-ext4@vger.kernel.org
To: "Jose R. Santos" <jrs@us.ibm.com>
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"Jose R. Santos" <jrs@us.ibm.com> writes:

> block boundary.  Dont have large disk to test on so Im playing with
> device mapper to see how I can fake one.  Our lab network is making
> thing difficult though.

Download

http://www.bullopensource.org/ext4/files/sparse_create

and for 32TiB use

dd if=/dev/zero of=/somewhere/SPACE bs=1 count=1 seek=100000000000
losetup /dev/loop0 /somewhere/SPACE
./sparse_create ext4dev /dev/loop0 68719476736

If you have a real block device to spare use that directly.

MfG
        Goswin