From: Josh Durgin <josh.durgin@inktank.com>
To: Nick Bartos <nick@pistoncloud.com>
Cc: ceph-devel@vger.kernel.org
Subject: Re: Is using the 'discard' mount option safe on an rbd?
Date: Thu, 06 Sep 2012 15:14:48 -0700 [thread overview]
Message-ID: <50492058.2030608@inktank.com> (raw)
In-Reply-To: <CAPud5_62LcGbmdQEdOP+KgdO4y6t=A6OvW3f9s8hxg5ULD-inA@mail.gmail.com>
On 09/06/2012 02:57 PM, Nick Bartos wrote:
> Is it safe to use the discard mount option when mounting a xfs
> filesystem on an rbd (using the kernel driver)? We're currently using
> kernel 3.5.3 and Ceph 0.48.1.
The kernel rbd driver doesn't support discard yet
(http://tracker.newdream.net/issues/190).
> Also, are there any stability issues doing it from a qemu VM? It
> looks like support for rbd discard was added in qemu 1.1, but I wasn't
> sure how stable it was.
There was one bug (http://tracker.newdream.net/issues/2958) whose fix
will be in the next release. Note that you need an extra qemu option
(http://tracker.newdream.net/issues/2777) for the guest to detect
discard support.
Josh
prev parent reply other threads:[~2012-09-06 22:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-06 21:57 Is using the 'discard' mount option safe on an rbd? Nick Bartos
2012-09-06 22:14 ` Josh Durgin [this message]
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