Environment

• Red Hat Enterprise Linux (RHEL), including:
  • Red Hat Enterprise Linux 5 (RHEL5)
  • Red Hat Enterprise Linux 6 (RHEL6)
• EMC Clariion SAN (Vendor:DGC, Model:RAID5)
  • It is currently unknown if other SAN's are affected.
• EMC Powerpath multipathing software
  • device-mapper-multipath is not affected by this issue.
  • EMC Powerpath license may or may not be installed.
• powermt display dev=all shows failover policy=BasicFailover and the mode of some paths is shown as "unlic":

# powermt display dev=all
Pseudo name=emcpowerd
CLARiiON ID=APM00000000000 [XXXXXXXXX]
Logical device ID=600601609EB4300028E77F7279FBE111 [LUN 10]
state=alive; policy=BasicFailover; priority=0; queued-IOs=0;                             <--- policy=BasicFailover
Owner: default=SP B, current=SP B       Array failover mode: 1
==============================================================================
--------------- Host ---------------   - Stor -   -- I/O Path --  -- Stats ---
###  HW Path               I/O Paths    Interf.   Mode    State   Q-IOs Errors
==============================================================================
   1 qla2xxx                  sdc       SP A6     active  alive       0      0
   1 qla2xxx                  sde       SP B6     active  alive       0      0
   2 qla2xxx                  sdg       SP A7     unlic   alive       0      0           <--- Paths status is unlic (Unlicensed)
   2 qla2xxx                  sdi       SP B7     unlic   alive       0      0           <--- Paths status is unlic (Unlicensed)