From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42060) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VBPC5-00089c-QG for qemu-devel@nongnu.org; Mon, 19 Aug 2013 09:08:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VBPBw-00088F-9C for qemu-devel@nongnu.org; Mon, 19 Aug 2013 09:08:25 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43091) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VBPBv-00087y-Qp for qemu-devel@nongnu.org; Mon, 19 Aug 2013 09:08:16 -0400 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r7JD8F6l008651 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 19 Aug 2013 09:08:15 -0400 Date: Mon, 19 Aug 2013 15:08:13 +0200 From: Stefan Hajnoczi Message-ID: <20130819130813.GF4829@stefanha-thinkpad.redhat.com> References: <1376904333-30336-1-git-send-email-kwolf@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1376904333-30336-1-git-send-email-kwolf@redhat.com> Subject: Re: [Qemu-devel] [PATCH] qcow2: Change default for new images to compat=1.1 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Kevin Wolf Cc: qemu-devel@nongnu.org On Mon, Aug 19, 2013 at 11:25:33AM +0200, Kevin Wolf wrote: > By the time that qemu 1.7 will be released, enough time will has passed s/has/have/ > since qemu 1.1, which is the first version to understand version 3 > images, that changing the default shouldn't hurt many people any more > and the benefits of using the new format outweigh the pain. In particular, compat=1.1 images include: * Feature bit fields which make the format more easily extensible * Zero clusters for data cluster preallocation, discard, efficient zero block migration, or block-backup * Lazy refcounts Reviewed-by: Stefan Hajnoczi Stefan