After you complete the upgrade prerequisites and download the virtual appliance update, you update the vRealize Automation 6.2.5 Appliance to 7.3 or 7.3.1. You also reconfigure some settings for the primary vRealize Automation appliance.
After you upgrade the primary vRealize Automation appliance node, you upgrade the other nodes in your environment in the following order:
Each secondary vRealize Automation appliance
IaaS Web site
IaaS Manager Service
Upgrade or migrate each external vRealize Orchestrator instance