From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neil Brown <neilb@suse.de>
Subject: Re: Resize RAID-0?
Date: Fri, 12 Mar 2010 22:53:21 +1100
Message-ID: <20100312225321.7581e324@notabene.brown>
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	<4B9A1A3A.6000209@anonymous.org.uk>
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To: John Robinson <john.robinson@anonymous.org.uk>
Cc: "Patrick J. LoPresti" <lopresti@gmail.com>, linux-raid@vger.kernel.org
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On Fri, 12 Mar 2010 10:40:58 +0000
John Robinson <john.robinson@anonymous.org.uk> wrote:

> On 12/03/2010 03:39, Patrick J. LoPresti wrote:
> > From reading the documentation and source code, I gather "mdadm
> > --grow" is not supported for RAID-0 devices.
> > 
> > In my application, I am using md RAID-0 to stripe among several
> > (identical) hardware RAID-0 chassis.  I would like to extend my setup
> > by adding another chassis, but apparently, I cannot (?).
> 
> If I remember correctly, there were patches posted to this list recently 
> to add support for reshaping RAID-0, and for migrating from RAID-0 to 
> other RAID levels, but I don't remember whether they've made it in to 
> the kernel/mdadm yet. I recommend a trawl through the last few months' 
> archives.

I'll save you the effort.  No they haven't.

The current plan is to support reshaping RAID-0 but converting the
RAID0 to a degraded RAID4, then reshaping it, then converting back.

But the code isn't ready yet.

NeilBrown