https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-3944 Lustre <p>We found this problem during reviewing lustre manual chapter 31.9. Usually, we can set threads_min like</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>lctl set_param mds.MDS.mdt_readpage.threads_min=16 </pre> </div></div> <p>But if we use conf_param to set it permanently, it will fail. It can be reproduced by the following steps:<br/> 1)lctl conf_param lustre.mdt.mdt_readpage.threads_min=16<br/> no error is reported, but dmesg shows</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>Lustre: Setting parameter lustre-MDT0000.mdt.mdt_readpage.threads_min in log lustre-MDT0000 LustreError: 1273:0:(obd_config.c:1591:class_config_llog_handler()) MGC10.211.55.18@tcp: cfg command failed: rc = -38 Lustre: cmd=cf00f 0:lustre-MDT0000 1:mdt.mdt_readpage.threads_min=16 </pre> </div></div> <p>2)since the previous lctl cmd doesn't report error, when you umount and remount mds next time, you will see "Function not implemented". </p> <p>BTW, "lctl set_param -P" introduced by <a href="https://jira.whamcloud.com/browse/LU-3155" title="Permanent parameters with lctl set_param -P" class="issue-link" data-issue-key="LU-3155"><del>LU-3155</del></a>, a new method to set parameter permanently for lustre 2.5 and later, has no such problem.</p> LU-3944

something wrong with "lctl conf_param" to set MDS/OSS thread count

Bug Minor Resolved Won't Fix Emoly Liu Emoly Liu Fri, 13 Sep 2013 07:35:57 +0000 Sat, 9 Oct 2021 05:44:02 +0000 Sat, 9 Oct 2021 05:44:02 +0000 Lustre 2.4.1 Lustre 2.5.0 1 6 <p>The root cause of this problem is that we have no "mds" proc methods for command "lctl conf_param", such as PARAM_MDS and mds_process_config. So, all mds.* proc parameters can't be processed.</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"><span class="code-comment">/* Prefixes <span class="code-keyword">for</span> parameters handled by obd's proc methods (XXX_process_config) */</span> #define PARAM_OST <span class="code-quote">"ost."</span> #define PARAM_OSC <span class="code-quote">"osc."</span> #define PARAM_MDT <span class="code-quote">"mdt."</span> #define PARAM_MDD <span class="code-quote">"mdd."</span> #define PARAM_MDC <span class="code-quote">"mdc."</span> #define PARAM_LLITE <span class="code-quote">"llite."</span> ... </pre> </div></div> <p>In old lustre version, thread count parameters were defined under /proc/fs/lustre/mdt/MDS/, and then, they were pulled into a new MDS layer in <a href="https://jira.whamcloud.com/browse/LU-718" title="pull out ptlrpc service from mdt stack to create a mds layer" class="issue-link" data-issue-key="LU-718"><del>LU-718</del></a>.</p> <p>Does any one work on a patch for this ticket? If not I will do it</p> <p>Hi Jacques, we still have no patch. It will be appreciated if you would do it.</p> <p>ok will work on one</p> <p>"<tt>lctl conf_param</tt>" is deprecated, use "<tt>lctl set_param -P</tt>" instead.</p> Development Rank 1|hzw287: Rank (Obsolete) 10443 Severity