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Date:      Thu, 16 Feb 2012 21:38:26 -0500 (EST)
From:      Garrett Wollman <wollman@hergotha.csail.mit.edu>
To:        freebsd@jdc.parodius.com
Cc:        stable@freebsd.org
Subject:   Re: New BSD Installer
Message-ID:  <201202170238.q1H2cQPs005803@hergotha.csail.mit.edu>
In-Reply-To: <20120217021019.GA61420@icarus.home.lan>
References:  <4F35743B.4020302@os2.kiev.ua> <4F37DBA3.7030304@cran.org.uk> <20120213195554.O46120@sola.nimnet.asn.au> <092c01cceb40$2dc8f240$895ad6c0$@fisglobal.com> <CAN6yY1uVhXMntWaK=P4dPrKY3aLR2fsKMWfS7Ncvpwy-XKM31Q@mail.gmail.com> <095a01cceb54$04a38fb0$0deaaf10$@fisglobal.com> <4F3ACDE7.8060003@bit0.com> <4F3D9A7C.7080900@quip.cz> <20120217001829.GA59869@icarus.home.lan> <alpine.BSF.2.00.1202161817500.47990@wonkity.com>

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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




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