Jason- You may find this article interesting [1]. It isn't clear whether your issue is the same as CERN's. But it would be interesting to know whether setting [compute]resource_provider_association_refresh [2] to a very large number (while leaving your periodic interval at its default) also mitigates the issue. Thanks, efried [1] https://techblog.web.cern.ch/techblog/post/placement-requests/ [2] https://docs.openstack.org/nova/latest/configuration/config.html#compute.resource_provider_association_refresh