Vcloud Director server group is composed of one or more Vcloud Director servers. Each Vcloud Director server is also known as cell. All of the Vcloud Director servers must connect to as Single Vcloud Director Database.
Resource Clusters, each Vcenter server system has it’s own Vcenter Server Database also. Each Vcenter server system in the group of resource cluster must connect to it’s own vShield Manage Server. There must be one-to-one ratio of Vshield Manager servers to Vcenter Server systems.