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From: Garrett Wollman <wollman@hergotha.csail.mit.edu>
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Subject: Re: New BSD Installer
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In article <20120217021019.GA61420@icarus.home.lan>,
Jeremy Chadwick  <freebsd@jdc.parodius.com> wrote:

>So for version 0.90 of their metadata format, you lose drive capacity by
>about 64-128KBytes, given that the space is needed for metadata.

Which is exactly what geom_mirror does, amazingly enough.  (Except, of
course, that geom_mirror only needs one sector!)  See the function
mirror_label() in /usr/src/sbin/geom/class/mirror/geom_mirror.c.  So
if geom_mirror is not working with GPT, you should look elsewhere for
the culprit.

-GAWollman