Figure 12 Hardware Acceleration for HP 3PAR devices
VMware All Paths Down
All Paths Down (APD), a feature of the VMware ESXi host used in cases where all paths to the VM go down because of storage failure or administrative error, is properly handled in ESX 5.1 as a result of feature enhancement performed by VMware. Previously, in ESX versions 5.0 or 4.1, the host would try continuously to revive the storage links and, as a result, performance would be impacted for working VMs. A host reboot was required to clear this error.
