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Hi John!</div>
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According to the documentation: <a href="https://www.ibm.com/docs/en/storage-scale/5.2.3?topic=reference-mmdelnode-command" data-outlook-id="35dda83f-119d-43a6-b2bb-9bc5542b4c44">
https://www.ibm.com/docs/en/storage-scale/5.2.3?topic=reference-mmdelnode-command</a></div>
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You need to remove the performance monitoring from the node</div>
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A node cannot be deleted if any of the following are true: </div>
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\u2026</div>
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4. If the node is configured as a performance monitoring collector. In such cases, you need to remove the node from the performance monitoring configuration by using the mmperfmon config update --collectors command before deleting the node. Deleting a collector
node causes loss of all the collected perfmon stats data on the collector node.</div>
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Hope this helps \U0001f60a</div>
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<p style="margin: 0cm; font-family: Calibri, sans-serif; font-size: 11pt;">Kind regards,</p>
<p style="margin: 0cm; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0cm; font-family: Calibri, sans-serif; font-size: 11pt;">Ivan Patrick Lambert</p>
<p style="margin: 0cm; font-family: Calibri, sans-serif; font-size: 11pt;">EMEA Storage Scale / Storage Scale System Engineer</p>
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<b>From: </b>gpfsug-discuss <gpfsug-discuss-bounces@gpfsug.org> on behalf of Jonathan Buzzard <jonathan.buzzard@strath.ac.uk><br>
<b>Date: </b>Saturday, 7 February 2026 at 18:25<br>
<b>To: </b>gpfsug-discuss@gpfsug.org <gpfsug-discuss@gpfsug.org><br>
<b>Subject: </b>[EXTERNAL] [gpfsug-discuss] Removing GUI nodes<br>
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I am trying to remove the GUI nodes from our cluster as they are no<br>
longer required. I have managed one but the other is proving to be a problem<br>
<br>
If I try and delete it I get<br>
<br>
[root@gpfs0 ~]# mmdelnode gui1<br>
mmdelnode: Node gui1.<redacted> is being used as a performance<br>
monitoring collector node.<br>
mmdelnode: Command failed. Examine previous error messages to determine<br>
cause.<br>
<br>
OK, lets change that<br>
<br>
[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>
<br>
<br>
That looks to have worked, lets try again 15 minutes later<br>
<br>
[root@gpfs0 ~]# mmdelnode gui1<br>
mmdelnode: Node gui1.<redacted> is being used as a performance<br>
monitoring collector node.<br>
mmdelnode: Command failed. Examine previous error messages to determine<br>
cause.<br>
<br>
Still no joy. From recollection the performance monitoring was only<br>
added as a requirement for setting up the GUI and was added to the GUI<br>
nodes.<br>
<br>
Do I have to designate another node for performance monitoring or is<br>
there a way to get rid of it altogether, given we don't have GUI nodes<br>
any more and are unlikely to have them ever again either.<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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