From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neil Brown <neilb@cse.unsw.edu.au>
Subject: Re: inserting a new disk in a raid 1
Date: Fri, 14 Jun 2002 19:56:20 +1000 (EST)
Sender: linux-raid-owner@vger.kernel.org
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In-Reply-To: message from =?ISO-8859-1?Q?Lo=EFc?= Paillotin on  June 14
To: =?ISO-8859-1?Q?Lo=EFc?= Paillotin <loic.paillotin@qualimucho.com>
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> Hello there.
> 
> I recently set  up a linux system. I had only one hard drive by that
> time, so I tought that I would configure it for software raid and see
> later when I had my second drive.
> I now have my second drive, and I don't have a clue on how to include i=
> t
> in my raid array. I tried to follow the tutorials ( that is, the raid
> HOWTO, but I'm probalby missing someting......
> thank you in advance,

Does
  raidhotadd /dev/md0 /dev/hdc1

work, where you replace /dev/hdc1 with the name of the partition on
your new drive.
If not, more details are needed, at the very least:

  cat /proc/partitions
  cat /proc/mdstat

NeilBrown