From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:34516) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SeioB-0000Wv-G5 for qemu-devel@nongnu.org; Wed, 13 Jun 2012 04:20:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Seio4-0002ga-H0 for qemu-devel@nongnu.org; Wed, 13 Jun 2012 04:20:07 -0400 Received: from e06smtp13.uk.ibm.com ([195.75.94.109]:47964) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Seio4-0002fv-8O for qemu-devel@nongnu.org; Wed, 13 Jun 2012 04:20:00 -0400 Received: from /spool/local by e06smtp13.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 13 Jun 2012 09:19:56 +0100 Received: from d06av05.portsmouth.uk.ibm.com (d06av05.portsmouth.uk.ibm.com [9.149.37.229]) by d06nrmr1507.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q5D8JrEw2244622 for ; Wed, 13 Jun 2012 09:19:54 +0100 Received: from d06av05.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av05.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q5D8Jrpt002639 for ; Wed, 13 Jun 2012 02:19:53 -0600 Date: Wed, 13 Jun 2012 09:19:52 +0100 From: Stefan Hajnoczi Message-ID: <20120613081952.GA2193@stefanha-thinkpad.localdomain> References: <1339513546-17538-1-git-send-email-stefanha@linux.vnet.ibm.com> <4FD75D11.60600@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4FD75D11.60600@redhat.com> Subject: Re: [Qemu-devel] [PATCH] qemu-img: document qed format on qemu-img man page List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Kevin Wolf Cc: Michael Tokarev , qemu-devel@nongnu.org On Tue, Jun 12, 2012 at 05:15:29PM +0200, Kevin Wolf wrote: > Am 12.06.2012 17:05, schrieb Stefan Hajnoczi: > > The qemu-img.1 man page is missing the qed format from its list of > > supported formats. Document the image creation options for qed. > > > > Suggested-by: Michael Tokarev > > Signed-off-by: Stefan Hajnoczi > > --- > > When the qcow2 QED mode is merged we can update this again to reflect good > > cache=writethrough performance in qcow2v3 /w QED mode. > > > > qemu-img.texi | 22 ++++++++++++++++++++++ > > 1 file changed, 22 insertions(+) > > > > diff --git a/qemu-img.texi b/qemu-img.texi > > index 6fc3c28..78640a9 100644 > > --- a/qemu-img.texi > > +++ b/qemu-img.texi > > @@ -232,6 +232,28 @@ to grow. > > > > @end table > > > > +@item qed > > +Image format with support for backing files and compact image files (when your > > +filesystem or transport medium does not support holes). Good performance due > > +to less metadata than the more featureful qcow2 format, especially with > > +cache=writethrough. > > Can we restrict this clearly to cache=writethrough only and possibly add > a few words about QED's future? > > It's good to have the option today for the few people that actually need > cache=writethrough, but I don't want more people than necessary to use > it only to notice after a while that there's no more active development > of QED and they have to do a painful conversion of all their images. Yes, that makes sense. Will send a v2. Stefan