You can use Update Manager to perform orchestrated upgrades of the ESX/ESXi hosts in your vSphere inventory by using a single upgrade baseline, or by using a baseline group.
Before you begin
Make sure your system meets the requirements for vCenter Server 5.x, ESXi 5.x, and Update Manager 5.x. See Update Manager Hardware Requirements
Install or upgrade vCenter Server to version 5.x. See Upgrading vCenter Server.
Install or upgrade vSphere Update Manager to version 5.x. See Upgrading Update Manager.
About this task
This workflow describes the overall process to perform an orchestrated upgrade of the hosts in your vSphere inventory. Update Manager 5.x supports host upgrades to ESXi 5.x for hosts that are running ESX/ESXi 4.x.
You can perform orchestrated upgrades of hosts at the folder, cluster, or datacenter level.
The last two steps in this procedure are alternatives. Choose one or the other.