[openstack-dev] [nova] live migration in Mitaka

Paul Carlton paul.carlton2 at hpe.com
Tue Oct 6 17:27:12 UTC 2015

On 06/10/15 17:30, Chris Friesen wrote:
> On 10/06/2015 08:11 AM, Daniel P. Berrange wrote:
>> On Tue, Oct 06, 2015 at 02:54:21PM +0100, Paul Carlton wrote:
>>> https://review.openstack.org/#/c/85048/ was raised to address the
>>> migration of instances that are not running but people did not warm to
>>> the idea of bringing a stopped/suspended instance to a paused state to
>>> migrate it.  Is there any work in progress to get libvirt enhanced to
>>> perform the migration of non active virtual machines?
>> Libvirt can "migrate" the configuration of an inactive VM, but does
>> not plan todo anything related to storage migration. OpenStack could
>> already solve this itself by using libvirt storage pool APIs to
>> copy storage volumes across, but the storage pool worked in Nova
>> is stalled
>> https://review.openstack.org/#/q/status:abandoned+project:openstack/nova+branch:master+topic:bp/use-libvirt-storage-pools,n,z 
> What is the libvirt API to migrate a paused/suspended VM? Currently 
> nova uses dom.managedSave(), so it doesn't know what file libvirt used 
> to save the state.  Can libvirt migrate that file transparently?
> I had thought we might switch to virDomainSave() and then use the cold 
> migration framework, but that requires passwordless ssh.  If there's a 
> way to get libvirt to handle it internally via the storage pool API 
> then that would be better.
> Chris
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So my reading of this is the issue could be addressed in Mitaka by

is there any prospect of this being progressed?

Paul Carlton
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Cloud Services
Hewlett Packard
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