> #### Reviewing a disk resource monitoring plan

> Fathom provides a default disk resource monitor, the name of which depends on the operating system and what drives are found on the machine.

> You can also add more disk resource monitors. Depending on the initial configuration options you selected, it is possible that all disks found on your system will have default monitors created for them. For more information about disk options available during the Fathom Management setup and installation process, see the appropriate section of the Installation and Configuration Guide.

> ##### Reviewing disk monitoring data

> Fathom Management provides a complete list of available system disk devices for which you can also set up and maintain individual disk resource monitors.

> To access a list of available disk devices:

> 1. Select Resources from the menu frame. The Fathom Resources page appears.
> 2. Select Disk. The Disk page appears:

> This page lists the available disk drives on your system.

> 3. From the Disk page, you can:
> - Define monitors for each of the disks.
> If, when you were initially configuring Fathom, you chose the option for Fathom to define monitors for all disks, resource monitors will already be in place for each disk. For more information about this configuration setting, see the section about initial configuration in the Installation and Configuration Guide.

> - Access detailed monitoring plans and rules for available disks you want to set up or whose values you want to edit.

> ##### Disk device statistics

> Fathom monitors the value in the Disk activity exceeds field, which indicates the percentage of elapsed time that the selected disk drive is busy servicing read or write requests. You can set an alert to trigger when this percentage is exceeded.

> ##### Trending performance data for disk 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 1 causes a disk resource monitor to trend data that it gathered primarily from the last poll.

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