The baremetal scheduling options were deprecated in Pike [1] and the ironic_host_manager was deprecated in Queens [2] and is now being removed [3]. Deployments must use resource classes now for baremetal scheduling. [4] The large host subset size value is also no longer needed. [5] I've gone through all of the references to "ironic_host_manager" that I could find in codesearch.o.o and updated projects accordingly [6]. Please reply ASAP to this thread and/or [3] if you have issues with this. [1] https://review.openstack.org/#/c/493052/ [2] https://review.openstack.org/#/c/521648/ [3] https://review.openstack.org/#/c/565805/ [4] https://docs.openstack.org/ironic/latest/install/configure-nova-flavors.html#scheduling-based-on-resource-classes [5] https://review.openstack.org/565736/ [6] https://review.openstack.org/#/q/topic:exact-filters+(status:open+OR+status:merged) -- Thanks, Matt