text: **5.3.1 Reference architecture summary**
  
  The deployment of Red Hat OpenShift Container Platform on PowerVC varies among several 
  factors that affect the installation process. Consider the following questions: 
  
  (cid:2) How many instances do you minimally require in the cluster? 
  (cid:2) How to configure the PowerVC Host Groups and colocation rules? 
  (cid:2) Is High Availability required? 
  (cid:2) What installation tools will you use? 
  (cid:2) Which storage and network backends will you use? 
  
  For this reference architecture, eight instances (VMs) were defined: six for the OpenShift 
  cluster, one for the Load Balancer, and one for the Deployment Host. We tested on Single or 
  Dual Host Groups (Availability Zones) and soft-anti-affinity rules for OpenShift cluster 
  instances (VMs). 
  
  This reference architecture requires High Availability configuration (as described in “High 
  Availability” on page 84) and uses Ansible and IBM Terraform for installation and prerequisite 
  checks. 
  
  **Note:**Terraform is not required to install OpenShift. Multiple approaches are available for 
  deploying infrastructure. In this book, we demonstrate how to use an infrastructure as code 
  with Terraform to simplify the deployment. The Terraform examples in this book are open 
  source and “use-at-your-own-risk” templates. 