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: Sat, 12 Nov 2011 07:39:22 -0600 Message-ID: <4EBE770A.1080102@codemonkey.ws> References: <4EBAAA68.10801@redhat.com> <4EBAACAF.4080407@codemonkey.ws> <4EBAB236.2060409@redhat.com> <4EBAB9FA.3070601@codemonkey.ws> <4EBB919B.7040605@redhat.com> <4EBC1792.3030004@codemonkey.ws> <4EBC4260.1090405@codemonkey.ws> <4EBCF5DA.1000605@redhat.com> <4EBD2B4F.5040409@codemonkey.ws> <4EBE4A02.1070204@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Kevin Wolf , Lucas Meneghel Rodrigues , KVM mailing list , "Michael S. Tsirkin" , "libvir-list@redhat.com" , Marcelo Tosatti , QEMU devel , Juan Jose Quintela Carreira To: Avi Kivity Return-path: Received: from mail-iy0-f174.google.com ([209.85.210.174]:64835 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751979Ab1KLNj0 (ORCPT ); Sat, 12 Nov 2011 08:39:26 -0500 Received: by iage36 with SMTP id e36so5178573iag.19 for ; Sat, 12 Nov 2011 05:39:25 -0800 (PST) In-Reply-To: <4EBE4A02.1070204@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On 11/12/2011 04:27 AM, Avi Kivity wrote: > On 11/11/2011 04:03 PM, Anthony Liguori wrote: >> >> I don't view not supporting migration with image formats as a >> regression as it's never been a feature we've supported. While there >> might be confusion about support around NFS, I think it's always been >> clear that image formats cannot be used. > > Was there ever a statement to that effect? It was never clear to me and > I doubt it was clear to anyone. You literally reviewed a patch who's subject was "block: allow migration to work with image files"[1] that explained in gory detail what the problem was. [1] http://mid.gmane.org/4C8CAD7C.5020102@redhat.com > >> >> Given that, I don't think this is a candidate for 1.0. >> > > Let's just skip 1.0 and do 1.1 instead. Let's stop being overly dramatic. You know as well as anyone that image format support up until the coroutine conversion has had enough problems that no one could practically be using them in a production environment. Live migration is an availability feature. Up until the 1.0 release, if you cared about availability and correctness, you would not be using an image format. Regards, Anthony Liguori