<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Hi Martin,</div><div><br></div><div>I really appreciate the help. <br></div></div><div><br></div><div>My answers are inline below.</div><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div dir="ltr"><div id="m_8110646284294991417m_-585840447576696450m_7890049679768417789m_-4994286033720769781divtagdefaultwrapper" style="font-size:12pt;color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif" dir="ltr"><p>One question: are you using the precompiled Lustre RPMs (e.g. those available from: <a href="https://downloads.whamcloud.com/public/lustre/lustre-2.15.6/" target="_blank">https://downloads.whamcloud.com/public/lustre/lustre-2.15.6/</a> ) or are you compiling
your own RPMs from the Lustre git repository ( <a href="https://github.com/lustre/lustre-release" target="_blank">https://github.com/lustre/lustre-release</a> ) ?</p>
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<p>In our case we use the second approach and I think it is better for two reasons:<br>
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<p>1- You make sure that everything is consistent, especially with your MOFED environment</p>
<p>2- You are not forced to use the specific versions corresponding to tags exactly, you can chose any version available in git repository or cherry-pick the fixes you think are useful (more details on this later).</p>
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<div><font size="2">Precompiled RPMs. <br></font></div></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div dir="ltr"><div id="m_8110646284294991417m_-585840447576696450m_7890049679768417789m_-4994286033720769781divtagdefaultwrapper" style="font-size:12pt;color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif" dir="ltr">
<p>In our case we upgraded last week a small HPC cluster using RHEL 8 for the file server and RHEL 9 for the clients. The update was successful and we had no problem related to MOFED, Lustre, PMIx, Slurm, MPI (including MPI-IO) up to now.</p>
</div></div></div></blockquote><div><br></div><div>Your upgrade scenario is similar to ours. We’re upgrading our servers from RHEL 7 with Lustre 2.12.6 to RHEL 8.10 with Lustre 2.15.x. The clients previously ran RHEL 7 and will now run RHEL 9.5.</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div dir="ltr"><div id="m_8110646284294991417m_-585840447576696450m_7890049679768417789m_-4994286033720769781divtagdefaultwrapper" style="font-size:12pt;color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif" dir="ltr">
<p>Our upgrade is described in a message posted on this mailing list on April 7th:</p>
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<p><a href="http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2025-April/019471.html" target="_blank">http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2025-April/019471.html</a></p>
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<div>Actually, our Lustre environment is a bit complex. It has approximately 570 TB of capacity, organized into two tiers: T0 (70 TB) and T1 (500 TB).</div><div><br></div><div>Its infrastructure is composed of two MDS servers connected to a Dell ME4024 storage array, and four OSS servers. Two of these OSS nodes are equipped with NVMe SSDs and provide the T0 tier (high-performance scratch space), while the other two OSS nodes are connected via SAS to two ME4084 storage arrays, supporting the T1 tier (long-term data). The entire system operates with high availability (HA) and load balancing (LB) mechanisms.</div></div><div><br></div><div><br></div><div>Cheers,</div><div><br><div>
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<div><i><b>Carlos Adean</b></i></div>
<div><a href="https://www.linea.org.br" target="_blank">www.linea.org.br</a></div>
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