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Date: Fri, 3 Jul 2009 00:53:12 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: pepe <plaine@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: replacing harddisks
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> I have gmirror of two 200GB disks where I have whole /usr f my freebsd 7.2
> system. root, /var and /boot are on other disk, but I need to replace those
> both disks with bigger ones now. To get bigger /usr. So what I'm wondering
> now is if there is way to take one disk out of mirror (geom) and add bigger.

yes. man gmirror

gmirror remove , gmirror forget.
> So it would be one 200g and one 640g. And after sync replace other 200g with

yes. make new (single disk at first) gmirror on new drive, copy data and 
make it bootable, shutdown, replace other 200G drive, boot from 640G and 
do gmirror insert