From mboxrd@z Thu Jan  1 00:00:00 1970
From: Josh Durgin <josh.durgin@inktank.com>
Subject: Re: Questions about journals, performance and disk utilization.
Date: Tue, 22 Jan 2013 16:25:07 -0800
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References: <58f5e24e5ac1a7bfff8fc6b90719ec75@skytech.dk> <50FF0197.6020202@inktank.com> <50FF0410.3030308@gmail.com> <50FF098C.8050707@profihost.ag> <50FF0B2E.6010301@inktank.com> <50FF0B6A.6070408@gmail.com>
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To: Jeff Mitchell <jeffrey.mitchell@gmail.com>
Cc: Mark Nelson <mark.nelson@inktank.com>, Stefan Priebe <s.priebe@profihost.ag>, martin <martin@skytech.dk>, "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>

On 01/22/2013 01:58 PM, Jeff Mitchell wrote:
> I'd be interested in figuring out the right way to migrate an RBD from
> one pool to another regardless.

Each way involves copying data, since by definition a different pool
will use different placement groups.

You could export/import with the rbd tool, do a manual dd like you
mentioned, or clone and then flatten in the new pool. The simplest
is probably 'rbd cp pool1/image pool2/image'.

Josh