82 Red Hat OpenShift and IBM Cloud Paks on IBM Power Systems: Volume 1
Depending on the infrastructure and servers types, you must determine the suitable choice 
when deciding between single and multiple Host Groups (Availability Zones) configuration. 
From an administrative perspective, it is easier to have single Host Group and not isolate the 
systems into multiple Host Group (Availability zones), as shown in Figure 5-4.
Figure 5-4   PowerVC single Host Group (Availability Zone)