From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions Date: Wed, 09 Nov 2011 14:22:02 -0600 Message-ID: <4EBAE0EA.1030405@codemonkey.ws> References: <4EBAAA68.10801@redhat.com> <4EBAACAF.4080407@codemonkey.ws> <4EBAB236.2060409@redhat.com> <4EBAB9FA.3070601@codemonkey.ws> <20111109201836.GA28457@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Lucas Meneghel Rodrigues , Kevin Wolf , KVM mailing list , Juan Jose Quintela Carreira , Marcelo Tosatti , QEMU devel , Avi Kivity To: "Michael S. Tsirkin" Return-path: Received: from mail-iy0-f174.google.com ([209.85.210.174]:46106 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755430Ab1KIUWH (ORCPT ); Wed, 9 Nov 2011 15:22:07 -0500 Received: by iage36 with SMTP id e36so2106962iag.19 for ; Wed, 09 Nov 2011 12:22:07 -0800 (PST) In-Reply-To: <20111109201836.GA28457@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On 11/09/2011 02:18 PM, Michael S. Tsirkin wrote: > On Wed, Nov 09, 2011 at 11:35:54AM -0600, Anthony Liguori wrote: >> On 11/09/2011 11:02 AM, Avi Kivity wrote: >>> On 11/09/2011 06:39 PM, Anthony Liguori wrote: >>>> >>>> Migration with qcow2 is not a supported feature for 1.0. Migration is >>>> only supported with raw images using coherent shared storage[1]. >>>> >>>> [1] NFS is only coherent with close-to-open which right now is not >>>> good enough for migration. >>> >>> Say what? >> >> Due to block format probing, we read at least the first sector of >> the disk during start up. > > A simple solution is not to do any probing before the VM is first > started on the incoming path. > > Any issues with this? > http://mid.gmane.org/1284213896-12705-4-git-send-email-aliguori@us.ibm.com I think Kevin wanted open to get delayed. Regards, Anthony Liguori