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Date: Tue, 6 Dec 2011 11:46:42 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Sean Bruno <seanbru@yahoo-inc.com>
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Cc: FreeBSD-Current <freebsd-current@freebsd.org>
Subject: Re: Is there a FreeBSD 9+ version of this?
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On Tue, 6 Dec 2011, Sean Bruno wrote:

> http://www.freebsd.org/doc/handbook/geom-mirror.html

Not in the Handbook.  To make gmirror work with GPT, create GPT 
partitions and mirror those.  I wrote an article on that using multiple 
partitions: http://www.wonkity.com/~wblock/docs/html/gmirror.html

However, it's since been pointed out that rebuilding the mirror could 
suffer from head contention.  Using a single GPT partition over the 
whole drive should not have that problem, but I haven't tested either 
way.