The os-hosts OS API extension [1] showed up before I was working on the project and I see that only the VMware and XenAPI drivers implement it, but was wondering why the libvirt driver doesn't - either no one wants it, or there is some technical reason behind not implementing it for that driver? [1] http://docs.openstack.org/api/openstack-compute/2/content/PUT_os-hosts-v2_updateHost_v2__tenant_id__os-hosts__host_name__ext-os-hosts.html -- Thanks, Matt Riedemann