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We only have a single, combined, mdt-mds... Would that impact it?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size: 11pt;"><b>From:</b> Spitz, Cory James <cory.spitz@hpe.com><br>
<b>Sent:</b> Wednesday, February 23, 2022 9:38 AM<br>
<b>To:</b> Patrick Farrell <pfarrell@ddn.com>; lustre-discuss@lists.lustre.org <lustre-discuss@lists.lustre.org>; Kurt Strosahl <strosahl@jlab.org><br>
<b>Subject:</b> [EXTERNAL] Re: Upgrading lustre servers</font>
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Kurt,</p>
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Also, please be aware of <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__jira.whamcloud.com_browse_LU-2D15177&d=DwMGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=a1-ymUluZsecMceDMlAHsomwMJl4Iqg-UcfvwQZVldk&m=thfKRnNis8r03L8aZZC4zLu_45O3r8VYupqRtOfVSDUwWb-hsa9zXchMldWPCpmH&s=_FvKrPYKhyAwed-k13lGmzVt8UUzo1z5rhdv9c0R-JQ&e=">
https://jira.whamcloud.com/browse/LU-15177</a>. A version interop check won\u2019t allow MDT-MDT version skew > 3 minor versions. Note, that check is just about MDT versions.</p>
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-Cory</p>
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On 2/21/22, 8:59 PM, "lustre-discuss" <lustre-discuss-bounces@lists.lustre.org> wrote:</p>
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<span style="font-size: 12pt; color: black;">Kurt,</span></p>
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<span style="font-size: 12pt; color: black;"> </span></p>
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<span style="font-size: 12pt; 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>\u200b supposed to do, because server version interop isn't tested outside the context of a rolling upgrade.</span></p>
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<span style="font-size: 12pt; color: black;">Regards, </span></p>
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<span style="font-size: 12pt; color: black;">Patrick</span></p>
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<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> </p>
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<span style="font-size: 12pt; color: black;">Good afternoon,</span></p>
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<span style="font-size: 12pt; color: black;">I have a question about upgrading lustre servers... </span></p>
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<span style="font-size: 12pt; color: black;">The lustre manual says the following:</span></p>
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<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."</span></p>
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<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?</span></p>
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<span style="font-size: 12pt; color: black;">w/r,</span></p>
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<p style="margin-left:.5in"><span style="font-size: 10.5pt; font-family: "Courier New"; color: rgb(51, 51, 51);">Kurt J. Strosahl (he/him)<br>
System Administrator: Lustre, HPC<br>
Scientific Computing Group, Thomas Jefferson National Accelerator Facility</span><span style="font-size: 12pt; color: black;"></span></p>
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