From mboxrd@z Thu Jan  1 00:00:00 1970
From: Josh Durgin <josh.durgin@inktank.com>
Subject: Re: About sparse images
Date: Mon, 27 Aug 2012 12:56:36 -0700
Message-ID: <503BD0F4.5060102@inktank.com>
References: <CAOLwVUnGz4ZvWdNo6JKHuS06YZYCeT7WjaDdGiDipRv8UZVLhA@mail.gmail.com> <649A15670E764B2E9397EDA1919205C7@inktank.com> <503A7EBE.1060500@widodh.nl>
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To: Wido den Hollander <wido@widodh.nl>
Cc: Gregory Farnum <greg@inktank.com>, =?UTF-8?B?U8OpYmFzdGllbiBIYW4=?= <han.sebastien@gmail.com>, ceph-devel <ceph-devel@vger.kernel.org>

On 08/26/2012 12:53 PM, Wido den Hollander wrote:
> As far as I know TRIM / Discard only works with KVM and SCSI disks,
> VirtIO still seems to lack this functionality, not sure about kernel RBD.

Kernel rbd doesn't support TRIM/discard yet 
(http://www.tracker.newdream.net/issues/190).