A vCloud Director server group consists of one or more Linux servers. Each server in the group runs a collection of services called a vCloud Director cell. All cells share a single vCloud Director database, and connect to multiple vCenter Server systems, the ESXi hosts that they manage, and the NSX Managers that provide networking services.
A typical installation creates a vCloud Director server group comprising several servers. You must install vCloud Director software on each server.
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.