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From: Mike Clarke <jmc-freebsd2@milibyte.co.uk>
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Date: Sat, 30 Jan 2010 09:39:06 +0000
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Cc: Danny Edge <nocmonkey@gmail.com>
Subject: Re: Software RAID options
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On Saturday 30 January 2010, Danny Edge wrote:

> Thanks, Glen, I should have mentioned that I did see gmirror
> mentioned in the HB. Pending further suggestions, I will try gmirror
> for software RAID 1 (yes, as large as the smallest disk).

It's also possible to mirror individual slices rather than an entire 
disk <http://people.freebsd.org/~rse/mirror/> so you could create 
matching slices on the disks and still have the spare space of the 
larger disk available for use as non-mirrored space.

-- 
Mike Clarke