Open Stack

Hi Sisu,

2014-06-05 16:33:27.509 TRACE nova.api.openstack.compute.contrib.admin_actions   File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 1840, in check_can_live_migrate_source
2014-06-05 16:33:27.509 TRACE nova.api.openstack.compute.contrib.admin_actions     raise exception.MigrationPreCheckError(reason=msg)
2014-06-05 16:33:27.509 TRACE nova.api.openstack.compute.contrib.admin_actions
2014-06-05 16:33:27.509 TRACE nova.api.openstack.compute.contrib.admin_actions MigrationPreCheckError: Migration pre-check error: VM.assert_can_migrate failed

The strange thing is sometimes it will migrate, but sometimes it cannot...

Can anyone help me with this? Why would the VM.assert_can_migrate fail?

The most typical failure in assert_can_migrate is around the compatability of the two host CPUs.  If they are different CPUs then they most likely support different feature sets.  When you have a VM it can only be migrated to a host if that new host has _at least_ all of the features that are available on the current host.

Check out http://support.citrix.com/article/CTX127059 - while OpenStack does not use pools, live migration depends on the same things, so setting cupid_feature_mask may allow the migration to succeed.

If this is not the issue, check /var/log/xensource.log for details on why XAPI determined that the VM cannot be live migrated.

Bob
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