A Best Practice when building a DellPS Series SAN is to use equal network speed on all hardware attached to the SAN. This includes host ports, network switches and PS Series arrays. When this is not possible, the PS Series Multi-Path I/O (MPIO) software included with Windows®, VMware® and Linux® HIT kits attempts to optimize the resources present. This document explains the behavior of the MPIO software in the event that the equipment attached to the SAN is not utilizing the same network speed.