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<p class="MsoNormal">Kurt,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Also, please be aware of <a href="https://jira.whamcloud.com/browse/LU-15177">
https://jira.whamcloud.com/browse/LU-15177</a>. A version interop check won’t allow MDT-MDT version skew > 3 minor versions. Note, that check is just about MDT versions.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Cory<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">On 2/21/22, 8:59 PM, "lustre-discuss" <lustre-discuss-bounces@lists.lustre.org> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt;color:black">Kurt,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt;color:black">The phrasing is a little confusing. The idea is that you can do a rolling upgrade, but it is important to complete the upgrade and not continue running with servers at
different versions. Version gaps between servers is OK in the context of a rolling upgrade but not otherwise. That case you are describing - deliberately leaving different versions on different servers - is specifically what you're
<b>not</b> supposed to do, because server version interop isn't tested outside the context of a rolling upgrade.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt;color:black">Regards,
<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt;color:black">Patrick<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="color:black">From:</span></b><span style="color:black"> lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Kurt Strosahl via lustre-discuss <lustre-discuss@lists.lustre.org><br>
<b>Sent:</b> Monday, February 21, 2022 2:31 PM<br>
<b>To:</b> lustre-discuss@lists.lustre.org <lustre-discuss@lists.lustre.org><br>
<b>Subject:</b> [lustre-discuss] Upgrading lustre servers</span> <o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in;background:white"><span style="font-size:12.0pt;color:black">Good afternoon,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in;background:white"><span style="font-size:12.0pt;color:black">I have a question about upgrading lustre servers... <o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in;background:white"><span style="font-size:12.0pt;color:black">The lustre manual says the following:<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in;background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in;background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">"Lustre software release 2.x.y release (minor) upgrade:<br>
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All servers must be upgraded at the same time, while some or all clients may be upgraded.<br>
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Rolling upgrades are supported for minor releases allowing individual servers and clients to be upgraded without stopping the Lustre file system."<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in;background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in;background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">which seems contradictory. Could I update one oss in a lustre file system from (say) 2.12.1 to 2.12.8, and leave the
rest of the file system alone?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in;background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt;color:black">w/r,<o:p></o:p></span></p>
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<p style="margin-left:.5in"><span style="font-size:10.5pt;font-family:"Courier New";color:#333333">Kurt J. Strosahl (he/him)<br>
System Administrator: Lustre, HPC<br>
Scientific Computing Group, Thomas Jefferson National Accelerator Facility</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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