DM-Multipath could not set user friendly names for SAN devices

Issue

• We have enabled user_friendly_names yes option in /etc/multipath.conf file, but still dm-multipath creates the multipath device maps using WWID instead of user friendly names (e.g. mpathn):

  $ less /etc/multipath.conf
  [...]
  defaults {
      user_friendly_names yes
      find_multipaths yes
  }
  
  $ multipath -v2
  $ multipath -ll
  360a98000572d5765636f65646544784e dm-3 NETAPP  ,LUN             
  size=10G features='4 queue_if_no_path pg_init_retries 50 retain_attached_hw_handle' hwhandler='0' wp=rw
  `-+- policy='service-time 0' prio=0 status=active
    |- 18:0:0:0 sdc 8:32 active undef running
    `- 19:0:0:0 sdb 8:16 active undef running