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Description of problem:
In #1449155 Klaus Wenninger warned me that SBD might fail-back to quorum-based-watchdog-self-fencing if poison-pill-fencing fails and 'stonith-watchdog-timeout' is (still) set.
For 2-node clusters without auto-tie-breaker, this is a serious data loss risk:
2-node clusters without additional arbitrators never lose quorum,
so both might fail to send poison-pills,
wait for 'stonith-watchdog-timeout',
and both take-over exclusive resources anyway: data loss.
even after i set:
$ pcs property unset stonith-watchdog-timeout;
i still get 'Relying on watchdog integration for fencing' in corosync.log,
luckily my SBD fencing agents work properly and fence via poison-pill before that happens.
can we enforce that 2-node clusters never ever activate/fallback-to watchdog-only-self-fencing behaviour no matter if stonith-watchdog-timeout is set or not?
Version-Release number of selected component (if applicable):
RHEL 7.3 with RHEL 7.4 dev SBD packages with poison-pill storage integration.
How to reproduce:
-) Setup SBD with poison-pill-fencing.
-) Falsely set stonith-watchdog-timeout (because you do not know exactly what's the difference between those 2 SBD modes).
-) Put both SBD agents into stopped mode.
-) Check if both nodes start their RAs on split-brain.
If there would be done any implementation solely for that issue it would probably have to be done on the pacemaker-side.
But as said before this is probably most effectively taken care of by making the mechanism described in bz1443666 automatically remove all cluster-nodes (2) from the list of nodes that are fenced via watchdog-fencing if 2-node is enabled.
*** This bug has been marked as a duplicate of bug 1443666 ***