I can use nova DifferentHostFilter to achieve VM anti-affinity, by passing in UUID of instance as scheduler hint. I am thinking later if I need do live migration or VM Evacuation, can anti-affinity relationship be still honored ? If no, is there a way to make sure after live migration or VM evacuation, the original anti-affinity relationship can be kept ? Kimi -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-operators/attachments/20131029/f0b93ff4/attachment.html>