From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33613) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xr2vQ-00005H-I4 for qemu-devel@nongnu.org; Wed, 19 Nov 2014 05:55:56 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Xr2vM-0007S7-Qt for qemu-devel@nongnu.org; Wed, 19 Nov 2014 05:55:52 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45095) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xr2vM-0007S0-B3 for qemu-devel@nongnu.org; Wed, 19 Nov 2014 05:55:48 -0500 Date: Wed, 19 Nov 2014 10:55:41 +0000 From: "Daniel P. Berrange" Message-ID: <20141119105540.GC31875@redhat.com> References: <546B781B.3070309@gmail.com> <546B791B.6040908@gmail.com> <20141118202805.GC29868@work-vm> <546BBC54.5050900@redhat.com> <20141119093516.GA2355@work-vm> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20141119093516.GA2355@work-vm> Subject: Re: [Qemu-devel] Tunneled Migration with Non-Shared Storage Reply-To: "Daniel P. Berrange" List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Dr. David Alan Gilbert" Cc: Paolo Bonzini , Gary R Hook , qemu-devel@nongnu.org On Wed, Nov 19, 2014 at 09:35:16AM +0000, Dr. David Alan Gilbert wrote: > * Paolo Bonzini (pbonzini@redhat.com) wrote: > > > > > > On 18/11/2014 21:28, Dr. David Alan Gilbert wrote: > > > This seems odd, since as far as I know the tunneling code is quite separate > > > to the migration code; I thought the only thing that the migration > > > code sees different is the file descriptors it gets past. > > > (Having said that, again I don't know storage stuff, so if this > > > is a storage special there may be something there...) > > > > Tunnelled migration uses the old block-migration.c code. Non-tunnelled > > migration uses the NBD server and block/mirror.c. > > OK, that explains that. Is that because the tunneling code can't > deal with tunneling the NBD server connection? Yep, pretty much. The tunnelling code was built around the idea of a single connection to be tunnelled. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|