From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christopher Smith <csmith@nighthawkrad.net>
Subject: Re: Migrating from non-RAID to RAID-1
Date: Wed, 10 Aug 2005 13:52:52 +1000
Message-ID: <42F97A14.4080300@nighthawkrad.net>
References: <7f45d93905080916414e291a87@mail.gmail.com>
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To: Shaun Jackman <sjackman@gmail.com>
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Shaun Jackman wrote:
> I have a single non-RAID SATA drive with Debian (Sarge) installed and
> data on it. I also have a duplicate blank drive. I would like to
> migrate from my non-RAID system to a RAID-1 (mirrored) system for
> redundancy, with each disk being an exact duplicate of the other. Is
> it possible to do this without having to wipe the first drive clean?
> I'd appreciate a pointer to a HOWTO or recipe if it answers this
> specific question.

This should get you started:

http://xtronics.com/reference/SATA-RAID-debian-for-2.6.html