Each site contains a local vSphere environment, including shared storage local to the corresponding vSphere environment. This includes (see Diagram 1 below):

VMware vCenter Server.

VMware vCenter Server Database Server.

VMware ESXi HA/DRS cluster.

NFS/SAN shared storage.

VMware vCenter Manager.

VMware vCenter Orchestrator (as necessary).

Each site (including one or more vSphere clusters) is mapped to a vCloud Director provider virtual datacenter.

The following alternative is not covered in this document: Having all the cells on one site to help control latency cross-talk concerns.