RedHat Linux DM-MPIO: PNR or ALUA?

Hi folks,

this is the default configuration in DM-MPIO (or Linux native multipathing) for VNX devices in multipath.conf :

       device {

               vendor "DGC"

               product ".*"

               product_blacklist "LUNZ"

               path_grouping_policy group_by_prio

               getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n"

               path_selector "round-robin 0"

               path_checker emc_clariion

               features "1 queue_if_no_path"

               hardware_handler "1 emc"

               prio emc

               failback immediate

               rr_weight uniform

               no_path_retry 60

               rr_min_io 1000

               rr_min_io_rq 1

       }

The "hardware_handler" parameter is configured to "1 emc" which is PNR.

The default configuration in VNX is Failover Mode 4 (ALUA), so I should change the configuration in multipath to ALUA (hardware_handler: "1 alua")? Or I should change the VNX configuration to Failover Mode 1?

This is a VNX5400 using iSCSI connectivity to the hosts (RHEL 6.8). There is a recommendation or best practice to use PNR or ALUA in this environment?

Thanks for your help!

Jorge.