From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Dillaman 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 Message-ID: References: <1498621012.13671278.1466154654173.JavaMail.zimbra@oxygem.tv> Reply-To: dillaman@redhat.com Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: Received: from mail-pa0-f54.google.com ([209.85.220.54]:35534 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753559AbcFQNVy (ORCPT ); Fri, 17 Jun 2016 09:21:54 -0400 Received: by mail-pa0-f54.google.com with SMTP id hl6so28595011pac.2 for ; Fri, 17 Jun 2016 06:21:53 -0700 (PDT) In-Reply-To: <1498621012.13671278.1466154654173.JavaMail.zimbra@oxygem.tv> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Alexandre DERUMIER Cc: ceph-devel 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 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 > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Jason