From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:51962) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QKXyU-0005rK-2V for qemu-devel@nongnu.org; Thu, 12 May 2011 11:38:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QKXyT-0002R3-3m for qemu-devel@nongnu.org; Thu, 12 May 2011 11:38:50 -0400 Received: from mx1.redhat.com ([209.132.183.28]:28192) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QKXyS-0002Qi-Oa for qemu-devel@nongnu.org; Thu, 12 May 2011 11:38:49 -0400 Message-ID: <4DCBFEC3.7010005@redhat.com> Date: Thu, 12 May 2011 17:37:39 +0200 From: Jes Sorensen MIME-Version: 1.0 References: <4DC7EEB0.3040007@redhat.com> <4DC806D7.6090400@codemonkey.ws> In-Reply-To: <4DC806D7.6090400@codemonkey.ws> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [RFC] live snapshot, live merge, live block migration List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: Kevin Wolf , dlaor@redhat.com, Marcelo Tosatti , qemu-devel , Avi Kivity , Stefan Hajnoczi On 05/09/11 17:23, Anthony Liguori wrote: >> >> * Live snapshots and live snapshot merge >> >> Live snapshot is already incorporated (by Jes) in qemu (still need >> qemu-agent work to freeze the guest FS). > > Live snapshot is unfortunately not really "live". It runs a lot of > operations synchronously which will cause the guest to incur downtime. > > We really need to refactor it to truly be live. We keep having this discussion, but as pointed out in my last reply on this, you can pre-create your image if you so desire. The actual snapshot then becomes less in one command. Yes we can make it even nicer, but what we have now is far less bad than you make it out to be. Cheers, Jes