From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dor Laor Subject: Re: [Autotest] [PATCH] Test 802.1Q vlan of nic Date: Wed, 21 Oct 2009 17:49:42 +0200 Message-ID: <4ADF2D96.6090405@redhat.com> References: <301351519.552421256044394416.JavaMail.root@zmail05.collab.prod.int.phx2.redhat.com> <1934714265.553191256044790508.JavaMail.root@zmail05.collab.prod.int.phx2.redhat.com> <20091021103756.GB2641@dhcp-66-70-48.nay.redhat.com> <4ADF10D0.3080405@redhat.com> Reply-To: dlaor@redhat.com Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Amos Kong , Michael Goldish , kvm@vger.kernel.org To: Uri Lublin Return-path: Received: from mx1.redhat.com ([209.132.183.28]:59617 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753901AbZJUPtk (ORCPT ); Wed, 21 Oct 2009 11:49:40 -0400 Received: from int-mx05.intmail.prod.int.phx2.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.18]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id n9LFnjAE024900 for ; Wed, 21 Oct 2009 11:49:45 -0400 In-Reply-To: <4ADF10D0.3080405@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On 10/21/2009 03:46 PM, Uri Lublin wrote: > On 10/21/2009 12:37 PM, Amos Kong wrote: >> On Tue, Oct 20, 2009 at 09:19:50AM -0400, Michael Goldish wrote: >>> ----- "Dor Laor" wrote: >>>> On 10/15/2009 11:48 AM, Amos Kong wrote: >>> For the sake of safety maybe we should start both VMs with -snapshot. >>> Dor, what do you think? Is it safe to start 2 VMs with the same disk >>> image >>> when only one of them uses -snapshot? >> >> Setup the second VM with -snapshot is enough. The image can only be >> R/W by 1th VM. >> > > Actually, I agree with Michael. If both VMs use the same disk image, it > is safer to setup both VMs with "-snapshot". When the first VM writes to > the disk-image the second VM may be affected. That's a must. If only one VM uses -snapshot, its base will get written and the snapshot will get obsolete.