Why `fence_mpath` fails with `ERROR:root:Failed to verify X device(s)`?

Solution In Progress - Updated -

Issue

  • testing fencing with fence_mpath from pacemaker fails and following error can be seen in corosync.log

    stonith-ng:  warning: log_action:    fence_mpath[XXXX] stderr: [ ERROR:root:Failed to verify X device(s) ]

  • testing fence_mpath manually prints the following error

    # fence_mpath -o off -k YY -d /dev/mapper/mpathZ
Failed to verify X device(s)

Environment

  • Red Hat Enterprise Linux 7 with High-Availability or Resilient Storage Add-on
  • fence-agents-mpath-4.0.11-86.el7_5.2 and possibly previous versions

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