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Date: Thu, 26 Apr 2012 17:47:20 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Andreas Longwitz <longwitz@incore.de>
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Cc: freebsd-geom@FreeBSD.org
Subject: Re: kern/164252: [geom] gjournal overflow
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I think you have too small journal partition.
Can you try to reproduce it with bigger journal partition? (double the 
size)
Or try to set shorter switch time (sysctl 
kern.geom.journal.switch_time) The default is 10 seconds, you can try 5.

You can also try to monitor values of some sysctl kern.geom.journal 
during test.

Miroslav Lachman