[RHEL6] Multipath device name and WWID isn't linked as configured.

Solution Verified - Updated -

Issue

  • A combination of mpathX and WWID can't be controlled by /etc/multipath/bindings.

  • Status after peforming "multipath -F" and "service multipathd restart". Result of "multipath -v4 -ll" is the same as /etc/multipath/bindings.

  • /etc/multipath/bindings

# created by Anaconda
mpathb 360000970000492600234533030333733
mpathc 360000970000492600234533030333734
mpathd 360000970000492600234533030333735
mpathd (360000970000492600234533030333735) dm-1 EMC,SYMMETRIX
size=2.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 0:0:0:2 sdc 8:32 active ready running
  `- 1:0:0:2 sdg 8:96 active ready running
   :
mpathc (360000970000492600234533030333734) dm-2 EMC,SYMMETRIX
size=24G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 0:0:0:1 sdb 8:16 active ready running
  `- 1:0:0:1 sdf 8:80 active ready running
   :
mpathb (360000970000492600234533030333733) dm-0 EMC,SYMMETRIX
size=16G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 0:0:0:0 sda 8:0  active ready running
  `- 1:0:0:0 sde 8:64 active ready running
  • Status after reboot. Result of "multipath -v4 -ll" is different from /etc/multipath/bindings.

  • /etc/multipath/bindings

# created by Anaconda
mpathb 360000970000492600234533030333733
mpathc 360000970000492600234533030333734
mpathd 360000970000492600234533030333735
mpathd (360000970000492600234533030333734) dm-1 EMC,SYMMETRIX
size=2.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 0:0:0:2 sdc 8:32 active ready running
  `- 1:0:0:2 sdg 8:96 active ready running
   :
mpathc (360000970000492600234533030333735) dm-0 EMC,SYMMETRIX
size=24G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 0:0:0:1 sdb 8:16 active ready running
  `- 1:0:0:1 sdf 8:80 active ready running
   :
mpathb (360000970000492600234533030333733) dm-2 EMC,SYMMETRIX
size=16G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 0:0:0:0 sda 8:0  active ready running
  `- 1:0:0:0 sde 8:64 active ready running
  • Actual result:
    mpathd 360000970000492600234533030333734
    mpathc 360000970000492600234533030333735
    mpathb 360000970000492600234533030333733

  • Expected result:
    mpathd 360000970000492600234533030333735
    mpathc 360000970000492600234533030333734
    mpathb 360000970000492600234533030333733

Environment

  • Red Hat Enterprise Linux 6.1

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