There can be multiple vCloud Director cells for load balancing and high availability. The supported maximum is 10 cells. The recommended minimum is 2 or N+1, where N is the number of resource group vCenter Server systems. If VMware Remote Console™ or OVF transfers are used extensively by the vCloud Director users, this can impact the vCloud Director cell utilization. Therefore, consider deploying new instances. In the case of a large number of vCenter Server systems with a small number of VMs, the following formula can be used:

Number of cell instances = n/3000 +1, where n is the number of expected powered on VMs