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Re: [Qemu-devel] Qemu and Changed Block Tracking

From: Eric Blake
Subject: Re: [Qemu-devel] Qemu and Changed Block Tracking
Date: Mon, 27 Feb 2017 10:56:46 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0

On 02/26/2017 02:41 PM, Peter Lieven wrote:
> The live-snapshot/live-commit stuff could indeed help in my scenario. If I 
> understand correctly this is
> something that already works today, correct? If I have taken a live-snapshot, 
> is live-migration and
> stop/start of the VM still possible? What about live-migration and start/stop 
> during live-commit?

Yes, a guest can be started or stopped while migration and/or
live-commit are underway.  You probably have to keep the qemu process
around (stopping the guest but keeping qemu alive is different than
stopping qemu altogether), which is where the persistence factors into
it (once we have persistent bitmaps, then stopping qemu altogether
becomes possible).

> I don’t talk about the dirty bitmap tracking I understand that persistence 
> and live-migration support
> is still in the works, I’m just interested in the snapshot/commit part.
> Thanks
> Peter

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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