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From: Jason Dillaman <jdillama@redhat.com>
To: Alexandre DERUMIER <aderumier@odiso.com>
Cc: ceph-devel <ceph-devel@vger.kernel.org>
Subject: Re: using discard from qemu guest when snapshot exist, fill the rbd layer with zeroes and use more space
Date: Fri, 17 Jun 2016 09:21:53 -0400	[thread overview]
Message-ID: <CA+aFP1A9a5ZEUzsJ_4_dRd_Ok7Ob4yk6PjaQNnrwWQbUmK6V3w@mail.gmail.com> (raw)
In-Reply-To: <1498621012.13671278.1466154654173.JavaMail.zimbra@oxygem.tv>

There is a "rbd_skip_partial_discard" configuration option which can
be set to true.  When enabled, discard will avoid zeroing holes if the
discard extent is in the middle of an object.

On Fri, Jun 17, 2016 at 5:10 AM, Alexandre DERUMIER <aderumier@odiso.com> wrote:
> Hi,
>
> I'm using fstrim inside my qemu guests to remove unused space from the rbd storage.
>
> This is working fine, but I just notice that if a snapshot exist,
>
> It just do the reverse, it's filling the snasphot with zeroes, and the total cluster space is growing.
>
> It's is possible to avoid that ?
>
>
> Regards,
>
> Alexandre
> --
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-- 
Jason

  reply	other threads:[~2016-06-17 13:21 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-17  9:10 using discard from qemu guest when snapshot exist, fill the rbd layer with zeroes and use more space Alexandre DERUMIER
2016-06-17 13:21 ` Jason Dillaman [this message]
2016-06-18  7:40   ` Alexandre DERUMIER
     [not found]     ` <2080661916.17082708.1466242175934.JavaMail.zimbra@oxygem.tv>
2016-06-18 12:08       ` Jason Dillaman

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