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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Looking at<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"> node {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"> ring0_addr: 10.255.153.159<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"> ring1_addr: 10.255.153.160<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"> name: lustre-oss-node31<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"> nodeid: 4<o:p></o:p></span></p>
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</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I wonder how the packets are routed: What is the netmask?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Ulrich Windl<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Users <users-bounces@clusterlabs.org>
<b>On Behalf Of </b>chenzufei@gmail.com<br>
<b>Sent:</b> Friday, March 14, 2025 10:48 AM<br>
<b>To:</b> users <users@clusterlabs.org><br>
<b>Subject:</b> [EXT] [ClusterLabs] Investigation of Corosync Heartbeat Loss: Simulating Network Failures with Redundant Network Configuration<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Microsoft YaHei UI",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:18.0pt;vertical-align:baseline"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">There are 11 physical machines, with two virtual machines running on each physical machine.<br>
</span><span style="font-size:10.5pt;font-family:"inherit",serif;color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">lustre-mds-nodexx</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt"> runs
the Lustre MDS server, and </span><span style="font-size:10.5pt;font-family:"inherit",serif;color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">lustre-oss-nodexx</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">
runs the Lustre OSS service.<br>
Each virtual machine is directly connected to two network interfaces, </span><span style="font-size:10.5pt;font-family:"inherit",serif;color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">service1</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">
and </span><span style="font-size:10.5pt;font-family:"inherit",serif;color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">service2</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">.<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:18.0pt;vertical-align:baseline"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">Pacemaker is used to ensure high availability of the Lustre services.<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:18.0pt;vertical-align:baseline"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">lustre(2.15.5) + corosync(3.1.5) + pacemaker(2.1.0-8.el8) + pcs(0.10.8)<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:18.0pt;vertical-align:baseline"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:18.0pt;vertical-align:baseline"><b><span style="font-size:10.5pt;font-family:"inherit",serif;color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">Issue</span></b><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">:
During testing, the network interface </span><span style="font-size:10.5pt;font-family:"inherit",serif;color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">service1</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">
on lustre-oss-node30 and lustre-oss-node40 was repeatedly brought up and down every 1 second (to simulate a network failure).<br>
The Corosync logs showed that heartbeats were lost, triggering a fencing action that powered off the nodes with lost heartbeats.<br>
Given that Corosync is configured with redundant networks, why did the heartbeat loss occur? Is it due to a configuration issue, or is Corosync not designed to handle this scenario?<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:18.0pt;vertical-align:baseline"><b><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">Other</span></b><span lang="ZH-CN" style="font-size:10.5pt;font-family:"Microsoft YaHei UI",sans-serif;color:#060607;letter-spacing:.2pt">：</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:18.0pt;vertical-align:baseline"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">The configuration of
</span><code><span style="color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">corosync.conf</span></code><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt"> can be found in the attached
file </span><code><span style="color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">corosync.conf</span></code><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">.<br>
Other relevant information is available in the attached file </span><code><span style="color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">log.txt</span></code><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">.<br>
The script used for the up/down testing is attached as </span><code><span style="color:#060607;letter-spacing:.2pt;border:none windowtext 1.0pt;padding:0cm">ip_up_and_down.sh</span></code><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#060607;letter-spacing:.2pt">.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">chenzufei@gmail.com<o:p></o:p></span></p>
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