[gpfsug-discuss] Removing GUI nodes

[Ivan Patrick Lambert]

Hi John!

According to the documentation: https://www.ibm.com/docs/en/storage-scale/5.2.3?topic=reference-mmdelnode-command

You need to remove the performance monitoring from the node

A node cannot be deleted if any of the following are true:
…
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.

Hope this helps 😊


Kind regards,



Ivan Patrick Lambert

EMEA Storage Scale / Storage Scale System Engineer

From: gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org> on behalf of Jonathan Buzzard <jonathan.buzzard at strath.ac.uk>
Date: Saturday, 7 February 2026 at 18:25
To: gpfsug-discuss at gpfsug.org <gpfsug-discuss at gpfsug.org>
Subject: [EXTERNAL] [gpfsug-discuss] Removing GUI nodes


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

If I try and delete it I get

[root at gpfs0 ~]# mmdelnode gui1
mmdelnode: Node gui1.<redacted> is being used as a performance
monitoring collector node.
mmdelnode: Command failed. Examine previous error messages to determine
cause.

OK, lets change that

[root at gpfs0 ~]# mmchnode --noperfmon -N gui1
Sat  7 Feb 12:29:48 GMT 2026: mmchnode: Processing node gui1.<redacted>
mmchnode: Propagating the cluster configuration data to all
   affected nodes.  This is an asynchronous process.


That looks to have worked, lets try again 15 minutes later

[root at gpfs0 ~]# mmdelnode gui1
mmdelnode: Node gui1.<redacted> is being used as a performance
monitoring collector node.
mmdelnode: Command failed. Examine previous error messages to determine
cause.

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.

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.


JAB.

--
Jonathan A. Buzzard                         Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG

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