Creating a Sample Alert
To demonstrate this, we will create an alert that triggers when the CPU is less than 99% idle (which will allow us to see the result of the alert immediately).
First, right click on the Alerts item under Performance Logs and Alerts and select New Alert Settings. Type Example Alert into the dialog box that appears, and click OK. You are presented with Figure 119.
The next task is to add the counters we wish to monitor in this case, percentage processor time. Click the Add button to display the Select Counters dialog. Select Processor in the Performance Object drop down list, click on % Processor Time in the counters list and click on _Total in the instances list8.
As you can see, there is a large amount of counters available for monitoring. Before closing the dialog, click the Explain button. A helpful window appears with a complete description of the selected counter.
The Explain button is very useful to be aware of, as the counter names can often be obscure or misleading.
Click the Add button to select the counter and dismiss the selection dialog. The next task is to configure how the alert will behave. To trigger the alert at 99% idle CPU, select Under from the Alert when value is drop down list, and type 99 into the Limit edit box. No further configuration is required; however click through the Action and Schedule tabs to be aware of what options are available. OK the dialog and the newly configured alert will appear in the MMC window.
8. Total is prefixed with an underscore to signify that it is a virtual value (i.e.: a combined value from all processors) rather than a physical one (i.e.: the usage of a single processor)
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