From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:47264) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UVMjv-0005pk-AE for qemu-devel@nongnu.org; Thu, 25 Apr 2013 10:01:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UVMjq-0003DJ-75 for qemu-devel@nongnu.org; Thu, 25 Apr 2013 10:01:35 -0400 Received: from mail-pd0-f174.google.com ([209.85.192.174]:54816) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UVMjq-0003Cy-1H for qemu-devel@nongnu.org; Thu, 25 Apr 2013 10:01:30 -0400 Received: by mail-pd0-f174.google.com with SMTP id y13so1442228pdi.33 for ; Thu, 25 Apr 2013 07:01:29 -0700 (PDT) Message-ID: <51793733.8050900@gmail.com> Date: Thu, 25 Apr 2013 22:01:23 +0800 From: Liu Yuan MIME-Version: 1.0 References: <1366886263-21263-1-git-send-email-morita.kazutaka@lab.ntt.co.jp> <5179333D.1040501@redhat.com> In-Reply-To: <5179333D.1040501@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [sheepdog] [PATCH 0/3] sheepdog: support online snapshot from qemu-img List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Eric Blake Cc: kwolf@redhat.com, stefanha@redhat.com, sheepdog@lists.wpkg.org, qemu-devel@nongnu.org, MORITA Kazutaka On 04/25/2013 09:44 PM, Eric Blake wrote: > Is that even safe? We specifically recommend that users NOT use > qemu-img on any image that is in-use by a qemu process, and instead only > use qemu monitor commands; since qemu-img may see inconsistent state, > and worse, any writes that qemu-img do may cause qemu to see > inconsistent state and cause corruption to the running guest. Then why not disable ( qemu-im snapshoting live VM) this behavior completely? Thanks, Yuan