The settings are:  Without PowerPath  1. If array is set to failover mode 1 (active/passive) the ONLY failover policy supported on ESX is MRU. ESX 3.x only supported failover mode 1  2. If the array is set to failover mdoe 4 (ALU) then ESX can be either FIXED or Round Robin. Only ESX 4.x supports failover mode 4  Please see the following on PowerLink"  EMC Host Connectivity Guide for VMWare ESX Server  -- A30  [URL]  glen
We just migrated all data from CX3 to a CX4 SAN.  If we would like to know "Round Robin" or "VMX_PSP_FIXED_AP" mutlipathing, do we need to get ALUA enabled ?  Moreover, does "VMX_PSP_FIXED_AP" require "PowerPath for ESX" installed ?  Thanks 
Do we need to enable ALUA for "Round Robin" Multipathing in vSphere?