vCenter Server versions 5.1 and later require the vCenter Single Sign-On and vCenter Inventory Service components. Depending on your existing vCenter Server installation, you can use the Simple Install option to upgrade to vCenter Server, including Single Sign-On and Inventory Service, all on a single host machine. This option is appropriate for small deployments.

You can use Simple Install to upgrade vCenter Server if you have a version 4.x or 5.0.x vCenter Server installation that is supported for upgrade. See vCenter Server Upgrade Summary. In this case, the Simple Install option installs Single Sign-On, upgrades Inventory Service, and upgrades vCenter Server.

If you are upgrading a version 5.1 vCenter Server installation to version 5.1.x, you cannot use Simple Install. Upgrade the Single Sign-On, Inventory Service, and vCenter Server components separately. See Separately Install vCenter Single Sign On, Upgrade Inventory Service, and Upgrade vCenter Server.

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Create the only node in a basic vCenter Single Sign-On installation.

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You can install vCenter Single Sign On, vCenter Inventory Service, and vCenter Server together on a single host machine using the vCenter Server Simple Install option.

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You can upgrade vCenter Server as part of a Simple Install after you install vCenter Single Sign On and upgrade Inventory Service.