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...9;, 'mode': 'absolute-paths', 'format': 'qcow2' } . . . Same question as yours, what is the NBD server going to run? My only NBD testing so far has been with w/ NBD over Unix socket or over TCP[**]. [*] http://lists.nongnu.org/archive/html/qemu-devel/2013-06/msg04229.html [**] NBD over TCP: (1) Run an NBD server locally: $ qemu-nbd -f qcow2 -p10809 \ /var/lib/libvirt/images/cirros-0.3.3-x86_64-disk.img -t (2) Create an overlay using the NBD server as backing file: $ qemu-img create -f qcow2 -F raw \ -o backing_file=nbd://localhost n...

On Wed, Mar 25, 2015 at 07:38:03PM +0100, Kashyap Chamarthy wrote: > On Mon, Mar 23, 2015 at 10:43:30PM +0000, Richard W.M. Jones wrote: > > [. . .] > > > > This makes a copy of the whole disk image. It's also not a consistent > > > (point in time) copy. > > > > Oh I see that you're copying the _snapshot_ that you created with > >

...mage and backing file: full-backup.img <- incremental-1.qcow2 <- incremental-2.qcow2 Or the NBD server would be a custom backup application that does something smart with the incoming NBD WRITE requests. Stefan > > > [*] http://lists.nongnu.org/archive/html/qemu-devel/2013-06/msg04229.html > > [**] NBD over TCP: > > (1) Run an NBD server locally: > > $ qemu-nbd -f qcow2 -p10809 \ > /var/lib/libvirt/images/cirros-0.3.3-x86_64-disk.img -t > > (2) Create an overlay using the NBD server as backing file: > > $ qemu-img create -f q...