>> The instance can also be migrated between 2 Westmere hosts. >> As I outline in another email, I suspect (perhaps incorrectly) as the >> VM has "cpu mode='host-model'" in its running config, libvirt may be >> comparing source and destination host CPUs and not guest and destination >> CPUs. > >Indeed it very much seems like it will look at the host cpu-model and not the >guest since it is complaining about Broadwell CPU features. >The libvirt documentation also sort of suggests this is the case: >https://libvirt.org/formatdomain.html#elementsCPU >“Prior to libvirt 3.2.0 and QEMU 2.9.0 detection of the host CPU model via >QEMU is not supported. Thus the CPU configuration created using host-model may >not work as expected.”
I think this may only apply when initially booting VM with "cpu mode='host-model'", when it determines compatible CPU features. Though I may be wrong. >You can have a look cheating your way around it. >There is some code which removes the checks which you might be able to (ab)use: >https://bugs.launchpad.net/nova/+bug/1588003 I don't think this will apply either as the error in the traceback is coming from LibVirt itself not Nova, which would imply Nova's pre-migration compatibility checks have passed and it attempted and failed to call LibVirt to migrate the VM. nova-compute: Traceback (most recent call last): nova-compute: File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 457, in fire_timers nova-compute: timer() nova-compute: File "/usr/lib/python2.7/site-packages/eventlet/hubs/timer.py", line 58, in __call__ nova-compute: cb(*args, **kw) nova-compute: File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 168, in _do_send nova-compute: waiter.switch(result) nova-compute: File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 214, in main nova-compute: result = function(*args, **kwargs) nova-compute: File "/usr/lib/python2.7/site-packages/nova/utils.py", line 1066, in context_wrapper nova-compute: return func(*args, **kwargs) nova-compute: File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5911, in _live_migration_operation nova-compute: instance=instance) nova-compute: File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__ nova-compute: self.force_reraise() nova-compute: File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise nova-compute: six.reraise(self.type_, self.value, self.tb) nova-compute: File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5907, in _live_migration_operation nova-compute: bandwidth=CONF.libvirt.live_migration_bandwidth) nova-compute: File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py", line 568, in migrate nova-compute: destination, params=params, flags=flags) nova-compute: File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 186, in doit nova-compute: result = proxy_call(self._autowrap, f, *args, **kwargs) nova-compute: File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 144, in proxy_call nova-compute: rv = execute(f, *args, **kwargs) nova-compute: File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 125, in execute nova-compute: six.reraise(c, e, tb) nova-compute: File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 83, in tworker nova-compute: rv = meth(*args, **kwargs) nova-compute: File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1939, in migrateToURI3 nova-compute: if ret == -1: raise libvirtError ('virDomainMigrateToURI3() failed', dom=self) nova-compute: libvirtError: unsupported configuration: guest and host CPU are not compatible: Host CPU does not provide required features: fma, x2apic, movbe, tsc-deadline, xs >You might want to double-check if a (hard)-rebooted migrated (with the >host-model config) instances on the Broadwell compute node does not get a >Broadwell cpu before modifying this ;) It doesn't, as the Broadwell hosts nova .conf has the following; cpu_mode = custom cpu_model = Westmere Oisin O'Malley Systems Engineer Iocane Pty Ltd 763 South Road Black Forest SA 5035 Office:+61 (8) 8413 1010 Fax:+61 (8) 8231 2050 Email:oisin.omal...@iocane.com.au Web:www.iocane.com.au Better for business _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
