[libvirt-users] Migration problem - takes 5 minutes to start moving the memory

[Daniel P. Berrange]

On Wed, Jun 01, 2016 at 03:55:37PM +0200, Peter Krempa wrote:
> On Wed, Jun 01, 2016 at 11:59:29 +0200, Marc-Aurèle Brothier - Exoscale wrote:
> > Hi,
> > 
> > I'm facing a strange issue while doing a migration from an hypervisor to another one. The migration takes for ever to start moving the memory.
> > The VM had no workload what so ever, just a basic ubuntu image. The versions on the hypervisors are: libvirt 1.2.21, qemu 1.2.3
> > 
> > Command to launche the migration:
> > virsh migrate --verbose --live --abort-on-error --tunnelled --p2p --auto-converge --copy-storage-inc --xml vm-6160.xml 6160  qemu+tls://<destination_hypervisor>/system
> > 
> 
> You are copying storage too. It takes 5 minutes to copy the storage. The
> memory migration starts after the storage migration converges.

I don't think that's it - if you look at the logs provided, you can see
that the storage was apparently fully copied after 49 seconds. There was
then 5 minutes where neither the disk or memory processed numbers
increased, before memory copying started. So there's something fishy
going on there, whether just bogus stats reporting by qemu or a genuine
delay/hang somewhere

Regards,
Daniel
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