You can migrate your existing external Orchestrator server to a vRealize Orchestrator instance embedded in vRealize Automation.
Starting with vRealize Orchestrator 7.5, you can no longer upgrade your Orchestrator environments. To move Orchestrator environments to the latest version, you must migrate them.
You can deploy vRealize Orchestrator as an external server instance and configure vRealize Automation to work with that external instance, or you can configure and use the vRealize Orchestrator server that is included in the vRealize Automation appliance.
VMware recommends that you migrate your external vRealize Orchestrator to the Orchestrator server that is built into vRealize Automation. The migration from an external to embedded Orchestrator provides the following benefits:
Reduces the total cost of ownership.
Simplifies the deployment model.
Improves the operational efficiency.
Consider using the external vRealize Orchestrator in the following cases:
Multiple tenants in the vRealize Automation environment.
Geographically dispersed environment.
Use of specific plug-ins, such as the Site Recovery Manager plug-in versions earlier than 6.5.