> #### Using the Configuration Advisor with a disk, CPU, or file system resource

> You can use the Configuration Advisor with the following resources: database, disk, CPU, and file system, and OpenEdge server components. (For details about using the Configuration Advisor with the database or OpenEdge server components, see the Database Management Guide or the OpenEdge Server Management Guide, respectively.)

> The way in which you use the Configuration Advisor with a disk, CPU, or file system resource is similar because each resource has only one rule. For each rule, the Configuration Advisor calculates recommended values based on a particular formula, as listed in Table 4–2.

> Table 4–2: CPU, disk, and file system rules and formulas
> Resource | Rule | Formula
> --- | --- | ---
> CPU | CPU High | CPU_Usr + CPU_System + CPU_Wait
> Disk | Disk busy | Dev_Pct_Busy
> File system | Filesystem used | FileSys_UsedPct

> In the case of the CPU rule CPU High, the Configuration Advisor looks at the sum of CPU_Usr, CPU_System, and CPU_Wait when calculating recommended values; for the disk resource, the Configuration Advisor looks just at the Dev_Pct_Busy value.

> The following steps describe the process of creating meaningful threshold settings for a disk resource; however, the steps pertain also to the CPU and file system resources.

> To use the Configuration Advisor with a disk resource:

> 1. Click the Disk category in the list frame.
> 2. Click the disk resource in the detail frame. The Disk Monitor page appears.
> 3. Click Configuration Advisor in the detail frame. The Configuration Advisor page for the disk appears:

> 4. In the Start Date and End Date fields, define a date range that Fathom will use to collect data from the FathomTrendDatabase. (The default data range covers one week.)
> 5. In the Choose time period to analyze section, identify the time frame that defines a representative period of time in which the rules are generally active, or being used; this time frame is the period against which you want Fathom to calculate your baseline activity. (The default time period is Monday through Friday, 9:00 AM to 5 PM.)
> In the Select rules (for analysis) section, the Disk Busy rule, which is the only rule available for analysis for a disk resource, is preselected.

> 6. Click Submit. The Configuration Advisor begins to calculate the threshold settings, and one of the following occurs:
> - If sufficient data exists for analysis, the Configuration Advisor displays the calculated result:

> You can now review the Configuration Advisor's recommendation and choose whether or not to update your threshold values. See the "Reviewing the recommended threshold settings" section for details.

> - If insufficient data exists for analysis, a message appears (under Recommend Values) informing you that there is insufficient data for analysis. For example, you might have fewer than 32 data samples stored in the FathomTrendDatabase. In this case, consider expanding the time between start and end dates to capture more data; then rerun the Configuration Advisor.

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