/etc/multipath.conf
 ## Use user friendly names, instead of using WWIDs as names.
   defaults {
           user_friendly_names yes
   }

   # Blacklist all devices by default. Remove this to enable multipathing
   # on the default devices.
   devnode_blacklist {
           devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
           devnode "^hd[a-z]"
           devnode "^cciss!c[0-9]d[0-9]*"
   }

   multipaths {
   devices {
           device {
                   vendor                  "NETAPP"
                   product                 "LUN"
                   path_grouping_policy    multibus
                   features                "1 queue_if_no_path"
                   path_checker            readsector0
                   path_selector           "round-robin 0"
                   failback                immediate
                   no_path_retry           queue
           }
           device {
                   vendor                  "NETAPP"
                   product                 "LUN"
                   path_grouping_policy    multibus
                   features                "1 queue_if_no_path"
                   path_checker            readsector0
                   path_selector           "round-robin 0"
                   failback                immediate
                   no_path_retry           queue
           }
   }


  751  vim /etc/multipath.conf
  752  /etc/init.d/multipathd start
  753  echo "scsi-qlascan" > /proc/scsi/qla2xxx/0
  754     echo "- - -" > /sys/class/scsi_host/host0/scan
  755     echo "scsi-qlascan" > /proc/scsi/qla2xxx/1
  756     echo "- - -" > /sys/class/scsi_host/host1/scan
  757     echo "scsi add-single-device controller 0 0 1 ">/proc/scsi/scsi
  758     echo "scsi add-single-device controller 0 0 1 ">/proc/scsi/scsi
  759  multipath
  760  multipath -ll