Red Hat OpenStack Platform is only supported for use with the
driver (using KVM as the hypervisor on Compute nodes) or the VMware vCenter hypervisor driver. See the VMware Integration Guide
for more information regarding the configuration of the VMware vCenter driver. The current supported VMware configuration is Red Hat OpenStack Platform with vCenter, with networking provided by a combination of either Neutron/NSX or Neutron/Nuage. For more information on Neutron/Nuage, see https://access.redhat.com/articles/2172831
Ironic has been fully supported since the release of Red Hat OpenStack Platform 7 (Kilo). Ironic allows you to provision bare-metal machines using common technologies (such as PXE boot and IPMI) to cover a wide range of hardware while supporting pluggable drivers to allow the addition of vendor-specific functionality.
Red Hat does not provide support for other Compute virtualization drivers such as the deprecated VMware "direct-to-ESX" hypervisor, and non-KVM libvirt hypervisors.