From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53288) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFfzF-000714-TC for qemu-devel@nongnu.org; Mon, 26 Jan 2015 04:29:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YFfzC-00070f-HR for qemu-devel@nongnu.org; Mon, 26 Jan 2015 04:29:37 -0500 Received: from mx1.redhat.com ([209.132.183.28]:43147) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFfzC-0006zc-Ao for qemu-devel@nongnu.org; Mon, 26 Jan 2015 04:29:34 -0500 Message-ID: <54C608F4.4020905@redhat.com> Date: Mon, 26 Jan 2015 10:29:24 +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> In-Reply-To: <201501260907583380898@sangfor.com.cn> Content-Type: text/plain; charset=gbk Content-Transfer-Encoding: quoted-printable 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 02:07, Zhang Haoyu wrote: > Hi, Kashyap > I've tried =A1=AEdrive_backup=A1=AF via QMP, > but the snapshots were missed to backup to destination, > I think the reason is that backup_run() only copy the > guest data regarding qcow2 image. Yes, that's the case. QEMU cannot still access internal snapshots while the file is open. External snapshots are opened read-only, and can be copied with "cp" while QEMU is running. Paolo