Multipath configuration for IBM SVC disk

make these changes to /etc/multipath.conf file and then restart multipathd daemon

#blacklist {

#        devnode "*"
#}

defaults {
      polling_interval       30
      failback               immediate
      no_path_retry          5
      rr_min_io              100
      path_checker           tur
      user_friendly_names    yes
      }

devices {
# SVC
        device {
                vendor                  "IBM "
                product                 "2145            "
                path_grouping_policy    group_by_prio
                prio_callout            "/sbin/mpath_prio_alua /dev/%n"
        }
}