[ovirt-users] migration failures

[Francesco Romani]

On 02/23/2017 04:20 PM, Michael Watters wrote:
> I have an ovirt cluster running ovirt 4.0 and I am seeing several errors
> when I attempt to put one of our nodes into maintenance mode.  The logs
> on the source server show errors as follows.
>
> Feb 23 10:15:08 ovirt-node-production3.example.com libvirtd[18800]: operation aborted: migration job: canceled by client
> Feb 23 10:15:08 ovirt-node-production3.example.com libvirtd[18800]: internal error: qemu unexpectedly closed the monitor: 2017-02-23T15:12:58.289459Z qemu-kvm: warning: CPU(s) not present in any NUMA nodes: 2 3 4 5 6 7 8 9 10 11 12 13 14 15                                                                               
>                                                                                2017-02-23T15:12:58.289684Z qemu-kvm: warning: All CPU(s) up to maxcpus should be described in NUMA config                                                                                                                                                 
>                                                                                2017-02-23T15:15:07.889891Z qemu-kvm: Unknown combination of migration flags: 0
>                                                                                2017-02-23T15:15:07.890821Z qemu-kvm: error while loading state section id 2(ram)
>                                                                                2017-02-23T15:15:07.892357Z qemu-kvm: load of migration failed: Invalid argument
>
> This cluster does *not* have NUMA enabled so I am not sure why this
> error is happening. 

It's one implementation detail. NUMA is enabled transparently because it
is required for memory hotplug support.
It should be fully transparent.


> Some migrations did succeed after being restarted
> on a different host however I have two VMs that appear to be stuck.  Is
> there a way to resolve this?

The load/save state errors are most often found when the two sides of
the migration have different and incompatible version of QEMU.
In turn, this is quite often a bug, because forward migrations (e.g.
from 2.3.0 to 2.4.0) are always supported, for obvious upgrade needs.

So, which version of libvirt and qemu do you have on the sides of
failing migration paths?

Bests,

-- 
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani