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Statistics Reporting

  3 minute read.

Last Modified 2021-03-25 18:09 EDT

Reporting General Settings

TrueNAS has a built in reporting engine that gives helpful graphs and information about the system. TrueNAS uses Graphite for metric gathering and visualizations. Some general settings can be found in System > Reporting.


When Report CPU usage in percent is set, it simply reports the CPU usage in percent rather than units of kernel time. When Graphite Separate Instances is set, it sends the plugin instance and type instance to Graphite as separate path components: host.cpu.0.cpu.idle. When it is not set, the plugin and plugin instance as one path component and type and type instance as another component: host.cpu-0.cpu-idle.

A Remote Graphite Server Hostname can be typed in the respective field. The Graph Age in Months field is used to set the maximum number of months a graphis stored. The Number of Graph points field is used to set the number of points for each hourly, daily, weekly, monthly, or yearly graph.

Report history is cleared when CPU reporting, Graph Age, or Graph Points are changed.


TrueNAS uses collectd to provide reporting statistics. A comprehensive list of graphs and reporting are found in Reporting. Change the category of reporting by selecting an option of the drop-down. Graphs can be interacted with by clicking and dragging on a certain range, or by clicking , , , .

Below is a summary of what each page of graphs displays:

CPU shows the amount of time spent by the CPU in various states such as executing user code, executing system code, and being idle. Graphs of short-, mid-, and long-term load are shown, along with CPU temperature graphs.


Disk shows read and write statistics on I/O, percent busy, latency, operations per second, pending I/O requests, and disk temperature. Choose the DEVICES and METRICS to view the selected metrics for the chosen devices.

Temperature monitoring for the disk is disabled if HDD Standby is enabled on the disk.


The default view shows a temperature graph of the first disk. To see the temperature graphs of more disks, select them from the DEVICES drop-down. To view other metrics such as Disk I/O and Disk Latency, select them from the METRICS drop-down.

Memory displays memory usage. Swap displays the amount of free and used swap space.


Network shows received and transmitted traffic in megabytes per second for each configured interface.


NFS shows information about the number of procedure calls for each procedure and whether the system is a server or client.


Partition displays free, used, and reserved space for each pool and dataset. However, the disk space used by an individual zvol is not displayed as it is a block device.


System displays the number of processes. It is grouped by state.


Target shows bandwidth statistics for iSCSI ports.


UPS displays statistics about an uninterruptible power supply (UPS) using Network UPS tools. Statistics include voltages, currents, power, frequencies, load, and temperatures.


ZFS shows compressed physical ARC size, hit ratio, demand data, demand metadata, and prefetch data.


Reporting data is saved to permit viewing and monitoring usage trends over time. This data is preserved across system upgrades and restarts.

Data files are saved in /var/db/collectd/rrd/.

Reporting data is frequently written and should not be stored on the boot pool or operating system device.