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You might need to change the perfmon config. Or disable perf monitoring.
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<div>You don\u2019t need the GUI to take advantange of that stuff though, AFAIK.</div>
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#BlackLivesMatter</div>
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____<br>
|| \\UTGERS, |---------------------------*O*---------------------------<br>
||_// the State<span class="Apple-tab-span" style="white-space: pre;"> </span> | Ryan Novosielski (he/him) - novosirj@rutgers.edu<br>
|| \\ University | Sr. Technologist - 973/972.0922 (2x0922) ~*~ RBHS Campus<br>
|| \\ of NJ<span class="Apple-tab-span" style="white-space: pre;"> </span> | Office of Advanced Research Computing - MSB A555B, Newark<br>
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<div>On Feb 7, 2026, at 12:23, Jonathan Buzzard <jonathan.buzzard@strath.ac.uk> wrote:</div>
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I am trying to remove the GUI nodes from our cluster as they are no longer required. I have managed one but the other is proving to be a problem<br>
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If I try and delete it I get<br>
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[root@gpfs0 ~]# mmdelnode gui1<br>
mmdelnode: Node gui1.<redacted> is being used as a performance monitoring collector node.<br>
mmdelnode: Command failed. Examine previous error messages to determine cause.<br>
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OK, lets change that<br>
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[root@gpfs0 ~]# mmchnode --noperfmon -N gui1<br>
Sat 7 Feb 12:29:48 GMT 2026: mmchnode: Processing node gui1.<redacted><br>
mmchnode: Propagating the cluster configuration data to all<br>
affected nodes. This is an asynchronous process.<br>
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<br>
That looks to have worked, lets try again 15 minutes later<br>
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[root@gpfs0 ~]# mmdelnode gui1<br>
mmdelnode: Node gui1.<redacted> is being used as a performance monitoring collector node.<br>
mmdelnode: Command failed. Examine previous error messages to determine cause.<br>
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Still no joy. From recollection the performance monitoring was only added as a requirement for setting up the GUI and was added to the GUI nodes.<br>
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Do I have to designate another node for performance monitoring or is there a way to get rid of it altogether, given we don't have GUI nodes any more and are unlikely to have them ever again either.<br>
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<br>
JAB.<br>
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-- <br>
Jonathan A. Buzzard Tel: +44141-5483420<br>
HPC System Administrator, ARCHIE-WeSt.<br>
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG<br>
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