VMware vCenter is a virtualization technology available for integration into OnApp. Use of the VMware vSphere 5 virtualization platform allows you to build a virtualized cloud infrastructure utilizing the highest standards of reliability and performance. OnApp Cloud integration allows you to run and manage VMware ESXi compute resources alongside Xen and KVM compute resources using the OnApp Control Panel. In OnApp all the ESXi compute resources are displayed as a single combined compute resource with a sum of the CPU, RAM, and Disk resources rather than individual compute resources. This section lists different issues related to vCenter and provides step-by-step resolutions and instructions.