After running 'pcs cluster unstandby' on multiple nodes simultaneously, only one unstandby command succeeds

Solution Verified - Updated -

Issue

  • After running pcs cluster unstandby on two nodes simultaneously, commands on both nodes appear to succeed with return-code 0 but in reality only one node goes into unstandby.

Environment

  • Red Hat Enterprise Linux 7.4 with High-Availability or Resilient Storage Add-on
  • Pacemaker
  • pcs-0.9.157-1.el7 or possibly earlier versions

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