device-mapper-multipath picks up some paths but not others, ports are presented and seen in /dev

Solution Verified - Updated -

Issue

  • Device-mapper-multipath does not pick up some paths, even though we can see the port in /dev, and the missing path sd devices can be read using parted, dd, or blockdev.

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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