RHEL7 All paths for a multipath lun fail after the message "alua: rtpg failed, result 65536"

Solution Verified - Updated -

Issue

  • After a san controller firmware upgrade all paths for a LUN can fail even though the LUN had paths through multiple san controllers.

Environment

  • Red Hat Enterprize Linux release 7.
  • Multipathed LUN using the ALUA hardware handler.
  • The LUN only has a single priority group.
  • Multipath dev_loss_tmo configued for that LUN.

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