From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dor Laor Subject: Re: [Qemu-devel] Re: KVM call agenda for Oct 19 Date: Tue, 19 Oct 2010 14:48:56 +0200 Message-ID: <4CBD93B8.9070002@redhat.com> References: <20101019021117.GI25455@sequoia.sous-sol.org> Reply-To: dlaor@redhat.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Juan Quintela , chrisw@redhat.com, "Venkateswararao Jujjuri (JV)" , qemu-devel@nongnu.org, kvm@vger.kernel.org, Ayal Baron To: Chris Wright Return-path: Received: from mx1.redhat.com ([209.132.183.28]:23683 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752172Ab0JSMtK (ORCPT ); Tue, 19 Oct 2010 08:49:10 -0400 In-Reply-To: <20101019021117.GI25455@sequoia.sous-sol.org> Sender: kvm-owner@vger.kernel.org List-ID: On 10/19/2010 04:11 AM, Chris Wright wrote: > * Juan Quintela (quintela@redhat.com) wrote: >> >> Please send in any agenda items you are interested in covering. > > - 0.13.X -stable handoff > - 0.14 planning > - threadlet work > - virtfs proposals > - Live snapshots - We were asked to add this feature for external qcow2 images. Will simple approach of fsync + tracking each requested backing file (it can be per vDisk) and re-open the new image would be accepted? - Integration with FS freeze for consistent guest app snapshot Many apps do not sync their ram state to disk correctly or frequent enough. Physical world backup software calls fs freeze on xfs and VSS for windows to make the backup consistent. In order to integrated this with live snapshots we need a guest agent to trigger the guest fs freeze. We can either have qemu communicate with the agent directly through virtio-serial or have a mgmt daemon use virtio-serial to communicate with the guest in addition to QMP messages about the live snapshot state. Preferences? The first solution complicates qemu while the second complicates mgmt.