Also, it's worth mentioning that you can still make changes without downtime.<div id="yMail_cursorElementTracker_1624273590788"><br></div><div id="yMail_cursorElementTracker_1624273590999">For example you can edit corosync conf and push it to all nodes, then set global maintenance, stop the cluster and then start it again.</div><div id="yMail_cursorElementTracker_1624273676452"><br></div><div id="yMail_cursorElementTracker_1624273676666">Best Regards,</div><div id="yMail_cursorElementTracker_1624273679822">Strahil Nikolov</div><div id="yMail_cursorElementTracker_1624273622702"><br></div><div id="yMail_cursorElementTracker_1624273623002"><br> <br> <blockquote style="margin: 0 0 20px 0;"> <div style="font-family:Roboto, sans-serif; color:#6D00F6;"> <div>On Mon, Jun 21, 2021 at 9:37, Jan Friesse</div><div><jfriesse@redhat.com> wrote:</div> </div> <div style="padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid #6D00F6;"> Gerry,<br clear="none"><br clear="none">> Dear community,<br clear="none">> <br clear="none">> I would like to ask few questions regarding Corosync/Pacemaker quorum configuration.<br clear="none">> <br clear="none">> When updating the Corosync's quorum configuration I added last_man_standing, and<br clear="none">> auto_tie_breaker in corosync.conf on all hosts and refreshed with<br clear="none">> 'corosync-cfgtool -R'.<br clear="none">> Note that that man page included with the rpm says that the -R option with "Tell<br clear="none">> all instances of corosync in this cluster to reload corosync.conf."<br clear="none">> <br clear="none">> Next I run 'corosync-quorumtool -s', but it did not show the new quorum flags<br clear="none">> for auto tiebreaker and last man standing.<br clear="none">> <br clear="none">> Once I restarted the corosync cluster, the auto tiebreaker flags and last man<br clear="none">> standing flags appeared in the corosync-quorumtool output as I expected.<br clear="none">> <br clear="none">> So my questions are:<br clear="none">> 1. Does corosync-quorumtool actually shows the active quorum configuration? If<br clear="none">> not how can I query the active quorum config?<br clear="none"><br clear="none">Yes, corosync-quorumtool shows quorum configuration which is really used <br clear="none">(it's actually only source of truth, cmap is not).<br clear="none"><br clear="none">> <br clear="none">> 2. Is it possible to update the quorum configuration without restarting the cluster?<br clear="none"><br clear="none">Partly.<br clear="none"><br clear="none">Basically only quorum.two_node and quorum.expected_votes are changeable <br clear="none">during runtime. Other options like:<br clear="none">- quorum.allow_downscale<br clear="none">- quorum.wait_for_all<br clear="none">- quorum.last_man_standing<br clear="none">- quorum.auto_tie_breaker<br clear="none">- quorum.auto_tie_breaker_node<br clear="none"><br clear="none">are not (wait_for_all is a little bit more complicated - when not <br clear="none">explicitly set/unset it follows two_node so it is possible, but only in <br clear="none">this special case, to change it via changing two_node).<br clear="none"><br clear="none">Regards,<br clear="none">   Honza<br clear="none"><br clear="none">btw. I've already replied to Janghyuk Boo so mostly copying same answer <br clear="none">also here.<br clear="none"><br clear="none">> <br clear="none">> Thank you,<br clear="none">> Gerry Sommerville<br clear="none">> E-mail: <a shape="rect" ymailto="mailto:gerry@ca.ibm.com" href="mailto:gerry@ca.ibm.com">gerry@ca.ibm.com</a> <mailto:<a shape="rect" ymailto="mailto:gerry@ca.ibm.com" href="mailto:gerry@ca.ibm.com">gerry@ca.ibm.com</a>><br clear="none">> <br clear="none">> <br clear="none">> <br clear="none">> _______________________________________________<br clear="none">> Manage your subscription:<br clear="none">> <a shape="rect" href="https://lists.clusterlabs.org/mailman/listinfo/users" target="_blank">https://lists.clusterlabs.org/mailman/listinfo/users</a><br clear="none">> <br clear="none">> ClusterLabs home: <a shape="rect" href="https://www.clusterlabs.org/" target="_blank">https://www.clusterlabs.org/</a><div class="yqt5137798478" id="yqtfd71480"><br clear="none">> <br clear="none"><br clear="none">_______________________________________________<br clear="none">Manage your subscription:<br clear="none"><a shape="rect" href="https://lists.clusterlabs.org/mailman/listinfo/users" target="_blank">https://lists.clusterlabs.org/mailman/listinfo/users</a><br clear="none"><br clear="none">ClusterLabs home: <a shape="rect" href="https://www.clusterlabs.org/" target="_blank">https://www.clusterlabs.org/</a><br clear="none"></div> </div> </blockquote></div>