> #### Reviewing the file system resource monitoring plan

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

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

> Note: Keep in mind that some of the file systems that are available to be monitored might not, in fact, be suitable for monitoring. UNIX-related examples that are considered unsuitable for monitoring include pseudo file systems used by the Kernel such as `/proc`, file systems that are actually mount points for remote or unmounted file systems. File system resource monitors set up for these types of file systems would be ineffective.

> ##### File system statistics

> By establishing values for statistics, you define the rules for a file system resource monitor. Fathom collects the following statistics related to the utilization of file systems:

> - File System Name — The name of the file system as it is known to the operating system.
> - File system usage — The percentage of file system capacity used.

> The File system usage exceeds statistic is gathered primarily for trend analysis. You can review these statistics and trend details to predict, to some extent, when it is time to extend or redesign your file system. Provided nothing other than the database is located on the file system, this detail indicates the database growth over time. You can set an alert to trigger when the percentage of file system capacity is exceeded.

> The file system information can also help with mapping device-busy metrics to a file system. You can see which files are involved with performance issues.

> ##### Reviewing file system monitoring data

> Fathom Management provides a complete list of available file systems for which you can set up and maintain individual file system resource monitors. Fathom also provides detailed data for all available file systems, whether monitored or not.

> To access a list of available file systems:

> 1. Select Resources from the menu frame. The Fathom Resources page appears.
> 2. Click FileSystem. The FileSystem page appears and lists the available file systems on your machine:

> 3. Click a file system. Details similar to the following appear:

> ##### Trending performance data for file systems

> 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 file system resource monitor to trend data that is taken from the last poll. No calculations are performed on this data.

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