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Date: Tue, 27 Jan 2009 10:10:05 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Vladislav Sekulic <vlad.sekulic@utoronto.ca>
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References: <20090126220411.b9c04ypy0wo04wkk@webmail.utoronto.ca>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Adding partitions to gmirror device
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> 2X 250GB SATA drives that I've established a gmirror(8) over, following the 
> instructions in section 19.4 of the Handbook.
>
> Now, one of the machines, being transformed into a webserver, needs a 
> separate, newly created /var/www partition (its current partitions only take 
> up 27G of the total ~238G available).
>
> My dilemma is -- how do I add another partition without hosing the system?

normally

bsdlabel -e /dev/mirror/yourmirror

and add partition