From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=52775 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PTaGE-0003zK-S9 for qemu-devel@nongnu.org; Fri, 17 Dec 2010 08:22:16 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PTaGC-0001dC-W0 for qemu-devel@nongnu.org; Fri, 17 Dec 2010 08:22:13 -0500 Received: from mtagate7.uk.ibm.com ([194.196.100.167]:58569) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PTaGC-0001cy-Ms for qemu-devel@nongnu.org; Fri, 17 Dec 2010 08:22:12 -0500 Received: from d06nrmr1507.portsmouth.uk.ibm.com (d06nrmr1507.portsmouth.uk.ibm.com [9.149.38.233]) by mtagate7.uk.ibm.com (8.13.1/8.13.1) with ESMTP id oBHDMAZh011319 for ; Fri, 17 Dec 2010 13:22:10 GMT Received: from d06av03.portsmouth.uk.ibm.com (d06av03.portsmouth.uk.ibm.com [9.149.37.213]) by d06nrmr1507.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id oBHDMC4F2719990 for ; Fri, 17 Dec 2010 13:22:12 GMT Received: from d06av03.portsmouth.uk.ibm.com (localhost.localdomain [127.0.0.1]) by d06av03.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id oBHDMAFb002658 for ; Fri, 17 Dec 2010 06:22:10 -0700 Date: Fri, 17 Dec 2010 13:22:10 +0000 From: Stefan Hajnoczi Message-ID: <20101217132210.GA25008@stefanha-thinkpad.localdomain> References: <1291651683-11990-1-git-send-email-stefanha@linux.vnet.ibm.com> <4D0B60C0.5070109@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4D0B60C0.5070109@redhat.com> Subject: [Qemu-devel] Re: [PATCH v6 0/5] qed: Add QEMU Enhanced Disk format List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Kevin Wolf Cc: Anthony Liguori , qemu-devel@nongnu.org, Avi Kivity On Fri, Dec 17, 2010 at 02:08:16PM +0100, Kevin Wolf wrote: > Am 06.12.2010 17:07, schrieb Stefan Hajnoczi: > > For a changelog against v5, see below. > > > > QEMU Enhanced Disk format is a disk image format that forgoes features > > found in qcow2 in favor of better levels of performance and data > > integrity. Due to its simpler on-disk layout, it is possible to safely > > perform metadata updates more efficiently. > > > > Installations, suspend-to-disk, and other allocation-heavy I/O workloads > > will see increased performance due to fewer I/Os and syncs. Workloads > > that do not cause new clusters to be allocated will perform similar to > > raw images due to in-memory metadata caching. > > > > The format supports sparse disk images. It does not rely on the host > > filesystem holes feature, making it a good choice for sparse disk images > > that need to be transferred over channels where holes are not supported. > > > > Backing files are supported so only deltas against a base image can be > > stored. The base image may be smaller than the image file. > > > > The file format is extensible so that additional features can be added > > later with graceful compatibility handling. A specification for the file > > format is included in this patchset. > > > > Internal snapshots are not supported. This eliminates the need for > > additional metadata to track copy-on-write clusters. > > > > Compression and encryption are not supported. They add complexity and can be > > implemented at other layers in the stack (i.e. inside the guest or on the > > host). Encryption has been identified as a potential future extension and the > > file format allows for this. > > > > Signed-off-by: Anthony Liguori > > Signed-off-by: Stefan Hajnoczi > > Thanks, reluctantly applied to the block branch. ;-) Thank you Kevin! Stefan