Hi,
Fixed path policy will work for all active-active storage.HoweveStorage partners using ESX 4.0 or later may recommend VMW_PSP_RR for path failover policy for certain storage array models. If desired, contact the storage array manufacturer for recommendation and instruction to set VMW_PSP_RR appropriately(Since they have tested).I have checked the Vmware HCL >http://www.vmware.com/resources/compatibility/detail.php?deviceCategory=san&productid=4427&deviceCategory=san&partner=30&keyword=cx4%20240&isSVA=1&page=1&display_interval=10&sortColumn=Partner&sortOrder=Asc