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

> On 01 Jun 2016, at 15:59, Daniel P. Berrange <berrange(a)redhat.com&gt; wrote: > > 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 > That's correct, the disk was copied pretty quickly and I could see it at the destination growing during those 49 seconds. What would you do to try to figure out what's going on?