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Hi,</div>
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You need to remove the perfmon role on all nodes of the cluster that were monitored (incl. GUI nodes) and delete the perfmon config of the cluster (or the other way around, cannot check right now). The gpfs.gss.pmsensor RPM can then be removed from all nodes
where it was installed (incl. GUI) and gpfs.gss.pmcollector from GUI servers.</div>
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HTH</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> gpfsug-discuss <gpfsug-discuss-bounces@gpfsug.org> on behalf of Jonathan Buzzard <jonathan.buzzard@strath.ac.uk><br>
<b>Sent:</b> Sunday, February 8, 2026 12:06:18 PM<br>
<b>To:</b> gpfsug-discuss@gpfsug.org <gpfsug-discuss@gpfsug.org><br>
<b>Subject:</b> [External] Re: [gpfsug-discuss] Removing GUI nodes</font>
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<div class="PlainText">On 07/02/2026 23:00, Jan-Frode Myklebust wrote:<br>
> mmperfmon config update --collectors othernode1,othernode2<br>
> <br>
<br>
That just pushes the performance monitoring to other nodes. I am pretty <br>
sure prior to installing the GUI nodes I didn't have any "performance <br>
monitoring" and having never used it would like to get back to that <br>
state of affairs :-)<br>
<br>
[root@gpfs0 ~]# mmperfmon config delete --all<br>
mmperfmon: The performance monitoring configuration cannot be deleted <br>
while there are nodes designated for performance monitoring. Please <br>
remove the designation with mmchnode --noperfmon.<br>
mmperfmon: Command failed. Examine previous error messages to determine <br>
cause.<br>
<br>
Noting that I have already attempted to designate my one remaining <br>
performance monitoring node (aka GUI node) as not doing that with <br>
mmchnode which does not seem to do anything.<br>
<br>
Noting that the manpage for mmperfmon say for config delete --all<br>
<br>
removes the entire performance monitoring configuration from<br>
IBM Storage Scale.<br>
<br>
I have tried upgrading the GUI node to 5.2.3 to match the rest of the <br>
system, and running the mmchnode --noperfmon on the node itself with <br>
GPFS both started and stopped. None of that made any difference :-( At <br>
least I can run mmchconfig release=LATEST now.<br>
<br>
Interestingly mmlscluster shows the two DSS-G nodes as having a <br>
designation of "quorum-manager-perfmon" and the GUI node as having no <br>
designation. Noting the two DSS-G nodes don't have the pmcollector or <br>
pmsensors RPM's installed.<br>
<br>
I suspect I am going to need to open a ticket for this one as something <br>
wacky is going on.<br>
<br>
<br>
JAB.<br>
<br>
-- <br>
Jonathan A. Buzzard Tel: +44141-5483420<br>
HPC System Administrator, ARCHIE-WeSt.<br>
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG<br>
<br>
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