14. Reporting

Reporting displays several graphs, as seen in the example in Figure 14.1. Click the tab for a device type to see its graphs.


Fig. 14.1 Reporting Graphs

FreeNAS® uses collectd to provide reporting statistics. collectd plugins are enabled in /conf/base/etc/local/collectd.conf to provide reporting graphs. These graphs are grouped into several tabs on the Reporting page:

  • CPU
    • CPU shows the amount of time spent by the CPU in various states such as executing user code, executing system code, and being idle.
  • Disk
    • Disk shows statistics on I/O, percent busy, latency, operations per second, and pending I/O requests.
  • Memory
    • Memory displays memory usage.
    • Swap displays the amount of free and used swap space.
  • Network
    • Interface shows received and transmitted traffic in bits per second for each configured interface.
  • Partition
    • Disk space displays free and used space for each volume and dataset. However, the disk space used by an individual zvol is not displayed as it is a block device.
  • System
    • Processes and Uptime displays the number of processes, grouped by state.
    • Uptime keeps track of the system uptime, the average running time, and the maximum reached uptime.
  • Target
    • Target shows bandwidth statistics for iSCSI ports.
  • ZFS
    • ZFS shows ARC size, hit ratio, and requests.

Reporting data is saved, making it possible to view and monitor usage trends over time. By default, reporting data is saved to /data/rrd_dir.tar.bz2 and is preserved across system upgrades and at shutdown. To instead save this data to the system dataset, check the Reporting database box in System System Dataset.

Use the magnifier buttons next to each graph to increase or decrease the displayed time increment from 10 minutes, hourly, daily, weekly, or monthly. The << and >> buttons can be used to scroll through the output.

Update on using Graphite with FreeNAS contains instructions for sending the collected information to a Graphite server.