From owner-freebsd-geom@FreeBSD.ORG  Wed Feb  8 04:36:27 2012
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To: freebsd-geom@freebsd.org
References: <004201cce607$e0c88920$a2599b60$@vidnet.net>
Date: Tue, 7 Feb 2012 22:36:26 -0600
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From: Mark Felder <feld@feld.me>
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Subject: Re: Need Help with a Raid 1  Time critical issue.
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Don't gmirror the entire drive. Create all of your gpt partitions and  
gmirror each partition individually.

Sorry, but there isn't a better way right now -- gmirror and gpt will  
fight if you try to do the whole disk.