Thursday, August 27, 2009

Override vs. Disable

By:Rik Hoffelder

System Center Operations Manager 2007 (and R2) offers several ways to override or even disable a monitor or rule. So which way is best? First it is important to understand the options available when you need to create an override. SCOM offers two options, Override and Disable (Figure 1). In many situations you want to disable the rule completely to no longer monitor that particular function. So you would instinctively choose the Disable the Rule option. This however would be the wrong choice..
Figure 1

By selecting this option you would write the override to the Default Management Pack. The Disable the Rule option does not allow you select a more appropriate management pack to write the customization. As noted in Understanding the Default Management Pack I recommend writing overrides, including disabling, to a management pack created just for customizations for the entity type.
The best method is to select the Override the Rule option. The Override the Rule option will allow you to select or create a management pack for the customization. When selecting Override the Rule you are presented several more options (Figure 2). These options allow you to target the override to the object generating the alert only, all similar objects, a specific group of similar objects, the rule itself, or a completely different object type.
Figure 2

So which is the best option? Is there a best practice recommendation? The answer really depends on what you want to accomplish. If the override is to set a higher alert threshold for the processor utilization for one particular server, you would select the For the object: Servername option. If you wanted to disable the Mailbox over Quota warning alert for all Exchange mailbox servers, you would select the For all objects of type: Exchange Mailbox Server Role option. However if you wanted to target the override to a particular subset of Exchange Mailbox servers you would create a group in Authoring mode then target the override to that specific group using the For a group option.
I hope this brings a little more clarity to these options and which is best for your implementation. Please feel freee to drop me a comment on this or future topics you would like to read.

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