From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neil Brown <neilb@suse.de>
Subject: Re: Is it possible to grow a RAID-10 array with mdadm?
Date: Mon, 30 Jul 2007 18:48:52 +1000
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In-Reply-To: message from Tomas France on Sunday July 29
Sender: linux-raid-owner@vger.kernel.org
To: Tomas France <tomfra@centrum.cz>
Cc: linux-raid@vger.kernel.org
List-Id: linux-raid.ids

On Sunday July 29, tomfra@centrum.cz wrote:
> Hi everyone,
> 
> Is it possible to add drives to an active RAID-10 array, using the "grow" 
> switch with mdadm, just like it is possible with a RAID-5 array? Or perhaps 
> there is another way?
> 
> I have been looking for this information for a long time but have been 
> unable to find it anywhere. The man page for mdadm does not mention RAID-10 
> at all so that didn't help either. Has anyone tried it?

The man page for mdadm does not mention it because it is not
supported.

There are several reshape options that I would like to implement
including
  - raid5 -> raid6
  - shrinking raid4/5/6
  - raid0 -> raid5
  - changing chunksize/layout of raid4/5/6
  - raid10 growing and layout change

unfortunately I haven't yet found/made the time.

Patches are always welcome :-)

NeilBrown