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<p class="MsoNormal">We had the same problem after we upgraded Lustre servers from 2.12.8 to 2.15.3.
<o:p></o:p></p>
<p class="MsoNormal">Clients were running 2.15.3 on CentOS 7. Random OST dropped out frequently on<o:p></o:p></p>
<p class="MsoNormal">busy login nodes (almost daily), but less so on compute nodes. “lctl” command<o:p></o:p></p>
<p class="MsoNormal">cannot active OSTs and reboot we the only way to clear the problem.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In June, we upgraded all client OS to AlmaLinux 9.3 and Lustre version to 2.15.4 on<o:p></o:p></p>
<p class="MsoNormal">both servers and clients (missed 2.15.5 release by about 2 weeks). After the upgrade,<o:p></o:p></p>
<p class="MsoNormal">we no longer have this problem.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In our case, I wonder this was OmniPath related. Servers on AlamLinux 8 was using<o:p></o:p></p>
<p class="MsoNormal">in kernel driver, but CentOS 7 clients are using driver from Intel/Cornelis release.<o:p></o:p></p>
<p class="MsoNormal">Alma 9 clients are now also using in kernel driver.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Lixin.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;color:black">From:
</span></b><span style="font-family:"Calibri",sans-serif;color:black">lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Cameron Harr via lustre-discuss <lustre-discuss@lists.lustre.org><br>
<b>Reply-To: </b>Cameron Harr <harr1@llnl.gov><br>
<b>Date: </b>Wednesday, August 28, 2024 at 8:19 AM<br>
<b>To: </b>"lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>Re: [lustre-discuss] How to activate an OST on a client ?</span><span style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p>There's also an "lctl --device <dev> activate" that I've used in the past though I don't know what conditions need to be for it to work.<o:p></o:p></p>
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<p class="MsoNormal">On 8/27/24 07:46, Andreas Dilger via lustre-discuss wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi Jan, <o:p></o:p></p>
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<p class="MsoNormal">There is "lctl --device XXXX recover" that will trigger a reconnect to the named OST device (per "lctl dl" output), but not sure if that will help. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers, Andreas<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On Aug 22, 2024, at 06:36, Haarst, Jan van via lustre-discuss
<a href="mailto:lustre-discuss@lists.lustre.org"><lustre-discuss@lists.lustre.org></a> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span lang="NL">Hi, </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="NL"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Probably the wording of the subject doesn’t actually cover the issue, what we see is this :</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">We have a client behind a router (linking tcp to Omnipath) that shows an inactive OST (all on 2.15.5).</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Other clients that go through the router do not have this issue.
</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">One client had the same issue, although it showed a different OST as inactive.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">After a reboot, all was well again on that machine.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">The clients can lctl ping the OSSs.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">So although we have a workaround (reboot the client), it would be nice to:</span><o:p></o:p></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3"><span lang="EN-US">Fix the issue without a reboot</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo3"><span lang="EN-US">Fix the underlying issue.</span><o:p></o:p></li></ol>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">It might be unrelated, but we also see another routing issue every now and then:</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">The router stops routing request toward a certain OSS, and this can be fixed by deleting the peer_nid of the OSS from the router.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I am probably missing informative logs, but I’m more than happy to try to generate them, if somebody has a pointer to how.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">We are a bit stumped right now.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">With kind regards,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">-- </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">Jan van Haarst</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="NL" style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">HPC
</span><span style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">Administrator</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">For Anunna/HPC questions, please use <a href="https://urldefense.us/v3/__https:/support.wur.nl__;!!G2kpM7uM-TzIFchu!1YPSOGUFPvipdg8HUxDkmcB7rvfUxuSATnKZq-9LFTP16TrMxtlrPe7m3ccX4BmKFoLsVnaKiIL3u4pxK2GT6mMjyuAoAg$"><span style="color:#0563C1">https://support.wur.nl</span></a> (with
HPC as service)</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="NL" style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">Aanwezig: maandag, dinsdag, donderdag & vrijdag </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="NL" style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">Facilitair Bedrijf, onderdeel van Wageningen University & Research </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="NL" style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">Afdeling Informatie Technologie </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="NL" style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">Postbus 59, 6700 AB, Wageningen </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="NL" style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB">Gebouw 116, Akkermaalsbos 12, 6700 WB, Wageningen </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:EN-GB"><a href="https://urldefense.us/v3/__http:/www.wur.nl/nl/Disclaimer.htm__;!!G2kpM7uM-TzIFchu!1YPSOGUFPvipdg8HUxDkmcB7rvfUxuSATnKZq-9LFTP16TrMxtlrPe7m3ccX4BmKFoLsVnaKiIL3u4pxK2GT6mP2LXgG1Q$" title="http://www.wur.nl/nl/Disclaimer.htm"><span style="color:#0563C1">http://www.wur.nl/nl/Disclaimer.htm</span></a></span><o:p></o:p></p>
</div>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">_______________________________________________<br>
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<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>lustre-discuss mailing list<o:p></o:p></pre>
<pre><a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a><o:p></o:p></pre>
<pre><a href="https://urldefense.us/v3/__http:/lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org__;!!G2kpM7uM-TzIFchu!1YPSOGUFPvipdg8HUxDkmcB7rvfUxuSATnKZq-9LFTP16TrMxtlrPe7m3ccX4BmKFoLsVnaKiIL3u4pxK2GT6mNJQIy33g$">https://urldefense.us/v3/__http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org__;!!G2kpM7uM-TzIFchu!1YPSOGUFPvipdg8HUxDkmcB7rvfUxuSATnKZq-9LFTP16TrMxtlrPe7m3ccX4BmKFoLsVnaKiIL3u4pxK2GT6mNJQIy33g$</a> <o:p></o:p></pre>
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