OnApp software transforms your server and storage hardware into a virtual network system that employs a Xen Compute resource virtualization architecture to control virtual protocols and security. With this infrastructure in place, OnApp users can host a multitude of secure cloud servers with more fluidity and control. A schematic of the OnApp architecture is shown below.

Hypervisors have been renamed as compute resources. Compute resources is a collective name for hypervisors, vCloud Director hypervisors and other hypervisor types.