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Date: Mon, 18 Oct 2010 12:13:41 +0100
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To: freebsd-geom@freebsd.org, perryh@pluto.rain.com
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From: Pete French <petefrench@ticketswitch.com>
Cc: 
Subject: Re: Subdividing a gmirror
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> Using the 8.1 memstick distribution, I've created a gmirror (which
> currently contains only one provider -- the other is to be added
> later), and Fixit can see /dev/mirror/gm0* once I've executed
> "gmirror load", but neither gpart nor fdisk seems to recognize gm0
> as something on which it can operate.  bsdlabel sees _something_,
> but it appears not to be valid.

try this...

	diskabel -w /dev/mirror/gm0

That will write a disk label to the mirrored drive, and you can
then editit it using

	disklabel -e /dev/mirror/gm0

to add your subdividions.

-pete.