How to remove OMS from SCOM

I am sometimes so annoyed that once you connect your SCOM to OMS it is hard to get rid of it. You even delete workspace, but only thing you get is some errors in SCOM console. Ok how to get it out if you temporary doesn’t want it there?

I started with Kevin Holman post about it but I had some trouble doing it so here is full  story. Lets first copy paste some things.

First of all we need to stop download of intelligence  management packs from OMS and all others related. To do that,  create override with name “override OMS temporary disable” , and disable two rules. Go to Authoring > Rules, and set your scope only to “Operations Manager Management Group”

Disable the following two rules:

image

It will disable automatic download of OMS MPs.

Now lets delete some MP

Open PowerShell and do next commands

Get-SCOMManagementPack -name “*advisor*” | Remove-SCOMManagementPack

Get-SCOMManagementPack -name “*IntelligencePack*” | Remove-SCOMManagementPack

get-SCOMManagementPack -name “Microsoft.EnterpriseManagement.Mom.Modules.AggregationModuleLibrary” | Remove-SCOMManagementPack

First command will probably fail. you will delete only one management pack but rest of it will not be possible because of dependency. This two you will have problems with

image

They have dependency on this management pack and you can not delete them. So what to do?

image

If you added run as account for System Center Advisor Run As Profile Proxy, and probably you did,  remove it from there. After that we need to edit this management pack. Go to PowerShell again and do this (don’t run it read first).

$MP = Get-SCOMManagementpack -Name Microsoft.SystemCenter.SecureReferenceOverride
$MP.References
$MP.References.Remove(“SystemCenter6“)
$MP.References.Remove(“SystemCenter5“)
$MP.Verify()
$MP.AcceptChanges()

To explain.

  1. With $MP.References you will show all reference inside this MP including Advisor ones.image
  2. After that you will remove references using right Key names listed for Advisor MPs
  3. With MP.Verify() you check everything to ensure there are no orphaned overrides, etc.
  4. If everything is OK do $MP.AcceptChanges() to save everything

After that you can easily delete first override mp “override oms temporary disable”  and both  left over Advisor MPs.

image

If I missed some step please comment

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