You can upgrade vCenter Server and other vCenter components separately to customize the location and configuration of each component.
- Use Custom Install to Upgrade a Standalone vCenter Single Sign-On Deployment of Version 5.1.x vCenter Server and Required Components.
- Use Custom Install to Upgrade vCenter Server from a Version 5.1.x High Availability vCenter Single Sign-On Deployment.
- Use Custom Install to Upgrade vCenter Server from a Version 5.1.x Multisite vCenter Single Sign-On Deployment.
For most standalone vCenter Single Sign-On deployments, if all components are on the same host machine, you can upgrade vCenter Single Sign-On, the vSphere Web Client, Inventory Service, and vCenter Server together on a single host machine using the vCenter Server Simple Install option.