A vCloud Director server group consists of one or more vCloud Director servers. These servers share a common database, and are linked to an arbitrary number of vCenter Server systems and ESXi hosts. Network services are provided to the vCenter Server systems and vCloud Director by the VMware NSX Manager™ component from VMware NSX™ for vSphere®.

A typical installation creates a vCloud Director server group comprising several servers. Each server in the group runs a collection of services called a vCloud Director cell. All members of the group share a single database. Each cell in the group connects to multiple vCenter Server systems, the hosts that they manage, and each NSX Manager that is configured to support each connected vCenter Server system.

Figure 1. vCloud Director Architecture Diagram
The cluster contains four vCloud Director servers, each of which runs a vCloud Director cell. The cluster is connected to vSphere, and to the vCloud Director database.

The vCloud Director installation and configuration process creates the cells, connects them to the shared database, and establishes the first connections to a vCenter Server system, that vCenter Server system's associated NSX Manager, and its hosts. A system administrator can then use the vCloud Director Web Console to add vCenter Server systems, the NSX Manager associated with the added vCenter Server system, and the added vCenter Server system's hosts to the vCloud Director server group at any time.