From mboxrd@z Thu Jan  1 00:00:00 1970
From: Luca Berra <bluca@comedia.it>
Subject: Re: Please help with a special RAID 1 setup
Date: Wed, 07 Jan 2004 17:09:26 +0100
Sender: linux-raid-owner@vger.kernel.org
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References: <E5DA6395B8F9614EB7A784D628184B207E14CE@hdsmsx402.hd.intel.com> <3FFC26E1.8040706@interplus.ro>
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To: Mircea Ciocan <mirceac@interplus.ro>
Cc: linux-raid@vger.kernel.org
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Mircea Ciocan wrote:
>    Ouch, so is there really no posibility to obtain somehow what I 
> explained in the previous mail ( a cvasi-realtime filesystem backup by 
> attaching and detaching a device) :(((
> Please tell me that there is a posibility, my world is shattered ;)
> 
use mdadm and recreate the array with 3 devices (using the missing 
keyword in place of the 3rd drive), then hotadd the new disk.

this operation does not destroy your data, but be sure to test it on a 
spare server until you are confident with the syntax

regards,
L.