The minimum system requirements for the vCenter Server are dependent on the size of the environment that's managed by the vCenter Server. Sizing vCenter Server correctly will ensure proper operation. The size of the vCenter inventory, the number of hosts, and the number of virtual machines all have an impact on the amount of resources required. Running multiple vCenter Server components on a single server (like an embedded PSC, for example) also determines the amount of resources that will need to be allocated to the vCenter Server.