From owner-freebsd-hackers@FreeBSD.ORG  Sat Nov  8 18:31:56 2003
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Date: Sat, 8 Nov 2003 18:30:41 -0800
From: David Schultz <das@FreeBSD.ORG>
To: Lukas Ertl <l.ertl@univie.ac.at>
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cc: hackers@FreeBSD.ORG
cc: phk@FreeBSD.ORG
Subject: Re: geom_mirror implementation
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On Sun, Nov 09, 2003, Lukas Ertl wrote:
> Hi hackers@,
> 
> I've played around with GEOM a bit and beefed up geom_mirror, which is
> already in the tree but not built yet.
> 
> You can find the patch at <http://mailbox.univie.ac.at/~le/geom.diff>.

Hmm...I believe geom_mirror is supposed to be an example, and
geom_ccd is supposed to be the production mirroring implementation.  
ccd does have its quirks, though...