Upgrade Scenario's for vCenter 6

The upgrade decision-making process depends on the placement of the vCenter Single Sign-On service and the vCenter Services.
First Scenario

• If a machine has Single Sign-On and vCenter Server installed, it becomes vCenter Embedded Platform Services Controller.

 Second Scenario

• If one machine has vCenter Server and Inventory Service installed.
• vSphere Web Client and Single Sign-On are in Separate Machines.

Third Scenario

• All vCenter 5.x components are installed on separate servers/VMs.
• After upgrade Web Client and inventory Service are defunct.
• Web Client and Inventory Service become part of Management Node.