From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1L2GtU-0007Mf-Su for qemu-devel@nongnu.org; Mon, 17 Nov 2008 22:04:48 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1L2GtT-0007MN-Dz for qemu-devel@nongnu.org; Mon, 17 Nov 2008 22:04:48 -0500 Received: from [199.232.76.173] (port=50797 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1L2GtO-0007MI-Tj for qemu-devel@nongnu.org; Mon, 17 Nov 2008 22:04:42 -0500 Received: from mail2.shareable.org ([80.68.89.115]:55394) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1L2GtO-00012o-Io for qemu-devel@nongnu.org; Mon, 17 Nov 2008 22:04:42 -0500 Date: Tue, 18 Nov 2008 03:04:37 +0000 From: Jamie Lokier Subject: Re: [Qemu-devel] [PATCH] add file: migration support (r2) Message-ID: <20081118030437.GA940@shareable.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200811140349.58757.paul@codesourcery.com> Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paul Brook Cc: qemu-devel@nongnu.org, Charles Duffy Paul Brook wrote: > > I'm not sure if "live" migration to a file is really useful. "Dead" > > migration is useful for suspending a VM to disk. > > Right. That's the point I was trying to make. I thought of a use for live migration to and from a file. It's when you have to restart a host while minimising downtime of all its guests. The liveness reduces that downtime. That could be rebooting, or simply replacing QEMU/KVM by a newer version. It would require a lot of guest memory (collectively), to be worth it. -- Jamie