From mboxrd@z Thu Jan  1 00:00:00 1970
From: Josh Durgin <josh.durgin@inktank.com>
Subject: Re: RBD trim / unmap support?
Date: Thu, 01 Nov 2012 16:36:44 -0700
Message-ID: <5093078C.4020404@inktank.com>
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To: Stefan Priebe <s.priebe@profihost.ag>
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On 11/01/2012 04:33 PM, Stefan Priebe wrote:
> Hello list,
>
> does rbd support trim / unmap? Or is it planned to support it?
>
> Greets,
> Stefan

librbd (and thus qemu) support it. The rbd kernel module does not yet.
See http://ceph.com/docs/master/rbd/qemu-rbd/#enabling-discard-trim

Josh