> #### Reviewing the CPU resource monitoring plan

> You do not have to set up monitoring plans and rules for your CPU resource. Fathom automatically provides a default resource named CPU when you initially start up Fathom Management. You cannot delete this Fathom-provided default resource, nor can you change its name. However, you can change the values in the CPU resource's monitoring plan definition and rule definition.

> To review the default CPU resource monitoring plan:

> 1. Click Resources from the menu bar.
> 2. In the list frame, expand the System category.
> 3. Expand the CPU category, and click the CPU resource. The CPU page opens in the detail frame:

> 4. To review the values set in the CPU's monitoring plan definition and rule definition, click the monitoring plan in the Name column. The monitoring plan appears, as shown in the following example:

> The default monitoring plan consists of the following monitoring plan definition values:

> - Schedule — Identifies the system-defined 24/7 default schedule used when the plan is active. The default is Default_Schedule.
> - Polling Interval — Identifies the polling cycle, which is the frequency at which the resource's rules are checked. The default is five minutes.
> - Alerts Enabled — Indicates whether alerts are active and will be generated when the plan is active. The default is true.
> - Trend Performance Data — Indicates whether you want to store performance data in the FathomTrendDatabase. The default is true.
> - Trend Every — Indicates how often performance data is trended. The default is 1 poll.
> The default monitoring plan consists of the following rule definition values:

> - Alert if CPU usage exceeds — Identifies when Fathom issues an alert on CPU usage. The default is 80%.
> Fathom monitors the percentage of CPU usage according to the value you enter in the Alert if CPU usage exceeds field within the rule definition. Fathom polls the CPU according to the Polling Interval value. This percentage reflects the percentage of time that a processor is busy executing a nonidle thread. You can view this percentage as the time spent doing useful work. You can also extrapolate the idle time based on this statistic.

> This statistic is presented as an average percentage based on snapshots taken at the beginning and end times of the defined sample period. Expressing the value as an average reduces the possibility of false alerts for random spikes in usage. For example, if your CPU monitor has a polling interval of 15 minutes, the average CPU time is calculated over this period of time.

> - Alert Severity — Identifies the severity level at which Fathom triggers an alert. The default is Error.
> - Throw alert after — Identifies at which point Fathom triggers an alert. The default is 2 failed polls.
> - On alert perform action — Identifies the action Fathom takes when an alert is generated. The default is Default Action.
> - Clear alert after — Identifies the number of successful polls after which Fathom clears the alert. The default is zero.
> - On clear perform action — Identifies a user-defined action or a compound action. For example, Fathom might run a job that was defined as an action. The default is None.

> ##### Trending performance data for CPU resources

> Once you enable trending by selecting the Trend Performance Data field, you can also override the default value of 1 in the Trend Performance Data every poll(s) field. Any value that you enter in this field that is greater than the default value of 1 causes a CPU resource monitor to trend an average of the data that it gathers between trends. This average is calculated as the sum of the values divided by the number of polls.

> ##### Editing the CPU resource defaults

> If you want to change any of the default CPU resource monitor values, click Edit from the Monitoring Plan page. The Edit Monitoring Plan page appears, as shown in Figure 5–1.

> Figure 5–1: Editing the CPU monitoring plan defaults

> Make any modifications you want, and click Save. The CPU page opens and reflects any changes you have made.

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