Error received when Enabling Perfmon Counter override for a Sub-Group

Question

Error received when Enabling Perfmon Counter override for a Sub-Group

Saiyad Rahim 431

I have created a Master Group and have individual Sub Groups for Disk, Memory, Network, Cpu. Any servers that need to have specific PerfMon Enabled (that are disabled by Default) will be put in any one of these required Groups.

I added member servers to the DIsk Sub group and while trying to Enable the Performon for Disk, i am receiving the error below stating that MP Elements are missing...can someone explain why I am getting is error?

Did i screw up somewhere?

I thought that as we add members to a Group, the Elements get updated automatically...what did i miss here?

Any help will be appreciated.

Capture

Subgroup

Error

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1 answer

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Answer 1

Hi Saiyad,

From the error in your screenshot, this does not look like a “group members did not update” problem. The validation is failing on the group definition / group population rule itself. The key part is the message that SCOM cannot resolve Microsoft.Windows.Server.Computer because the alias Microsoft.Windows.Library.75850101 is unknown in that management pack. In other words, the group MP has a broken or inconsistent reference/alias entry.

A few important points here:

Using a group for an override is supported, but the group and the override cannot live in different unsealed MPs. Microsoft documents that clearly: if you use a group to scope an override, the override must be saved in the same unsealed MP as the group, unless the group MP is sealed.

Your screenshot suggests the problem is even lower-level than that: the MP that contains the group seems to have a bad/missing reference alias for the Windows library, so SCOM cannot validate the GroupPopulationDataSource.

What I would do:

Check where the override is being saved. Make sure you are saving the override into the same unsealed MP that contains the Disk group. If it is a different unsealed MP, fix that first.
Export the MP MASTER.MP.for.Enabling.Windows.Performance.Counters.BOTH and inspect the XML. Look under Manifest > References for the Windows library reference and then search the XML for the alias shown in the error (Microsoft.Windows.Library.75850101). If the alias is missing, duplicated, or inconsistent, that is the root cause.
If this MP has been edited/reused/imported multiple times, check for duplicate/bad aliases. Microsoft has a KB specifically for detecting and correcting duplicate management pack aliases. The symptoms are not identical in every case, but the remediation pattern is relevant here: export the MP, correct the alias/reference entries, and reimport it.
If you want the quickest fix, recreate the groups in a fresh unsealed MP. Honestly, for a structure like this, I would probably create fresh groups for CPU / Disk / Memory / Network in a new MP and test again. Also, the Master group with subgroups is not really required just to scope performance-counter overrides. The individual groups are enough. That avoids carrying forward any bad XML/reference metadata from the current MP.

So the short version is:
you did not miss a “membership refresh” step. The issue is most likely a broken MP reference/alias in the group MP, or an attempt to save the override in a different unsealed MP than the group.

Best Regards

Stoyan Chalakov

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