90 Red Hat OpenShift and IBM Cloud Paks on IBM Power Systems: Volume 1
/SM590000Use PowerVC to manage the LPM feature to migrate VMs from one host to another. The 
LPM is important for frame evacuation during maintenance operations. It is recommended 
to include a dedicated Network interface for VIO management. 
Figure 5-9 shows how LPM is working with HMC configuration.
Figure 5-9   Live Partition Mobility (LPM) with PowerVC and HMC
/SM590000Master/Infrastructure nodes are configured with the automatic remote restart; in case of 
host failure, PowerVC automatically restarts the VMs (LPARs) on different hosts.
/SM590000Create Server Groups for OpenShift VMs and configure soft-anti-affinity rules.
OpenShift HA
OpenShift is also deployed for HA. In this reference architecture, the etcd state database is 
colocated across the master nodes. The etcd requires a minimum of three nodes for HA. All 
master nodes are configured in PowerVC to automatically restart in case of any host failure.
This reference architecture also uses three infrastructure nodes. Infrastructure nodes host 
OpenShift infrastructure components, such as the registry, containers for log aggregation, 
and metrics. A minimum of three infrastructure nodes are needed for HA when a shared 
aggregated logging database is used, and to ensure that service interruptions do not occur 
during a restart. All infrastructure nodes are configured in PowerVC to automatically restart in 
case of any host failure.