Now that all resources have been migrated, verify that nothing was forgotten at the source vCenter Server. Refer back to part 1. Make sure all permissions have been set on the destination resources in case you need to go back to the source to double check. Would not be fun to roll back once the single command to unregister a vCenter Server is ran.

KB2106736 has the steps for the appliance and Windows versions to unregister a vCenter Server from a PSC. In the addition to the KB article, I have two suggestions. Take a snapshot of all PSCs before running the command just to be safe.  I did run into a small issue at first, but nothing negative happened because of it. The vCenter name in the cmsso-util unregister command is case sensitive. “Could not find a host id which maps to NAME INPUTTED in Component Manager, Failed!!!” was the error message I received. If the vCenter Server is not found when running the command, I suggest you instead use the IP address of the vCenter Server.

The unregister command went well for me after I entered the vCenter Server in the correct case. It took a few minutes to run before I received the success output.

That completed the major steps in my migrations. I spent time afterwards to put datastores back in datastores clusters, import host profiles, etc. Documentation is important to assist in making your clusters look how they did before.

Migrate Resources to a New vCenter Server (Part 1)
Migrate resources to a new vCenter Server – Methods for Migrations (Part 2)
Migrate resources to a new vCenter Server – Cross vCenter vMotion Utility (Part 3)
Migrate resources to a new vCenter Server – Unregister old vCenter Servers (Part 4)