From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neil Brown <neilb@suse.de>
Subject: Re: Linear RAID hot grow
Date: Tue, 21 Aug 2007 15:22:53 +1000
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In-Reply-To: message from Dat Chu on Monday August 20
Sender: linux-raid-owner@vger.kernel.org
To: Dat Chu <dattanchu@gmail.com>
Cc: Justin Piszcz <jpiszcz@lucidpixels.com>, linux-raid@vger.kernel.org
List-Id: linux-raid.ids

On Monday August 20, dattanchu@gmail.com wrote:
> I am currently running 2.6.22.1 kernel with mdadm version 2.6.2.

That combination should work.

> 
> When I try to run
> mdadm --grow /dev/md2 --add /dev/sdd1
> mdadm: Cannot add new disk to this array

Odd.  I tried add a drive to a three-drive linear array and it
worked, though my drives are somewhat smaller than yours - that
shouldn't matter though.

Do you get any kernel messages at the time when you try to add?
  dmesg | tail -20

NeilBrown