From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:50951) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T5wK1-00020F-5L for qemu-devel@nongnu.org; Mon, 27 Aug 2012 06:13:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1T5wJu-0005KS-5C for qemu-devel@nongnu.org; Mon, 27 Aug 2012 06:13:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:12672) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T5wJt-0005KM-T5 for qemu-devel@nongnu.org; Mon, 27 Aug 2012 06:13:22 -0400 Message-ID: <503B483B.2070103@redhat.com> Date: Mon, 27 Aug 2012 12:13:15 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <835dcf7c-af96-4196-9be7-84755f06ccf0@mailpro> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] qcow2: online snasphots : internal vs external ? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi Cc: Jeff Cody , Eric Blake , qemu-devel , Alexandre DERUMIER Il 27/08/2012 11:04, Stefan Hajnoczi ha scritto: >> > Also I see that snapshot_blkdev qmp command give in his description: >> > "Otherwise the snapshot will be internal! (currently unsupported)." >> > >> > is Live internal snapshots on the roadmap ? > I'm not aware of anyone working on adding internal snapshot in the > near future. Patches are welcome. The main problem with internal snapshots is that it's difficult to work with two snapshots at the same time, especially if you need to write to two of them. IIUC this is why people concentrated more on external snapshots. It's not intrinsic to internal snapshots, more like a wart of the implementation, but not an easily fixed one. Paolo