From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47569) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFhqW-0002RU-0f for qemu-devel@nongnu.org; Mon, 26 Jan 2015 06:28:44 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YFhqQ-0006yP-Ud for qemu-devel@nongnu.org; Mon, 26 Jan 2015 06:28:43 -0500 Received: from mail-wi0-x22a.google.com ([2a00:1450:400c:c05::22a]:61820) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFhqQ-0006yH-NH for qemu-devel@nongnu.org; Mon, 26 Jan 2015 06:28:38 -0500 Received: by mail-wi0-f170.google.com with SMTP id em10so5603994wid.1 for ; Mon, 26 Jan 2015 03:28:38 -0800 (PST) Sender: Paolo Bonzini Message-ID: <54C624E2.2010608@redhat.com> Date: Mon, 26 Jan 2015 12:28:34 +0100 From: Paolo Bonzini MIME-Version: 1.0 References: <201501211832330964659@sangfor.com.cn>, <54BF81F0.9070908@redhat.com>, <20150122232948.GQ12638@tesla.redhat.com>, <201501260907583380898@sangfor.com.cn> <201501261913435951960@sangfor.com.cn> In-Reply-To: <201501261913435951960@sangfor.com.cn> Content-Type: text/plain; charset=gbk Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [question] incremental backup a running vm List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Zhang Haoyu , Kashyap Chamarthy Cc: Fam Zheng , Stefan Hajnoczi , qemu-devel , kvm On 26/01/2015 12:13, Zhang Haoyu wrote: > Thanks, Paolo, > but too many internal snapshots were saved by customers, > switching to external snapshot mechanism has significant impaction > on subsequent upgrade. In that case, patches are welcome. :) > Another problem: > drive_backup just implement one time backup, > but I want VMWare's VDP-like backup mechanism. > The initial backup of a virtual machine takes comparatively more time, > because all of the data for that virtual machine is being backed up. > Subsequent backups of the same virtual machine take less time, because > changed block tracking (log dirty) mechanism is used to only backup the dirty data. > After inittial backup done, even the VM shutdown, but subsequent backup also only > copy the changed data. As mentioned before, patches for this are on the list. Paolo