Why are the blacklist exceptions in my multipath configuration ignored?

Solution Verified - Updated -

Issue

  • When setting up a both a blacklist and a blacklist exception list in multipath.conf, the blacklist exception list gets ignored
  • Can not see the whitelisted devices
  • Lun not visible in multipath

Environment

  • Red Hat Enterprise Linux 5, 6, 7 & 8
  • device-mapper-multipath

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