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<p class="MsoNormal"><span style="font-size:11.0pt">I should say we deal with the common startup race described in votequorum(5), whereby nodes that don’t come up are fenced once quorum is attained, by other means.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">-Olaf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Faaland, Olaf P. <faaland1@llnl.gov><br>
<b>Date: </b>Friday, May 2, 2025 at 10:25</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">AM<br>
<b>To: </b>users@clusterlabs.org <users@clusterlabs.org><br>
<b>Subject: </b>last_man_standing (LMS) and wait_for_all (WFA)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hi,</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">In votequorum(5), discussing last_man_standing (LMS) and wait_for_all (WFA) with corosync-3.1.8-1.el8.x86_64, it says:</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="p1"><span class="s1">Enabling</span><span class="apple-converted-space">
</span><span class="s1">LMS</span><span class="apple-converted-space"> </span><span class="s1">allows the cluster to dynamically recalculate expected_votes and quorum under specific circumstances. It</span>
<span class="s1">is essential to enable </span><span class="s2">WFA</span><span class="s1"> when using LMS in High Availability clusters.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Why is that essential?</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I have many, many clusters, and there will be times when a node is down because we need replacement parts or something similar, and the cluster must be rebooted (e.g. an OS update).</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks!</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Olaf</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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