2 minute read.Last Modified 2023-11-20 13:04 EST
An Uninterruptible Power Supply (UPS) is a power backup system that ensures continuous electricity during outages, preventing downtime and damage.
Connect the TrueNAS system to the UPS device. Configure the UPS service by going to Services, finding the UPS entry, and clickingedit icon.
TrueNAS EnterpriseTrueNAS High Availability (HA) systems are not compatible with uninterruptible power supplies (UPS).
See UPS Screen for more information on UPS settings.
Some UPS models can be unresponsive with the default polling frequency.
This shows in TrueNAS logs as a recurring error like
libusb_get_interrupt: Unknown error.
The default polling frequency is two seconds. Decrease the polling frequency by adding an entry to Auxiliary Parameters (ups.conf):
pollinterval = 10. This should resolve the error.
upsc(8) can get status variables like the current charge and input voltage from the UPS daemon.
Run this command from the shell using the syntax
The upsc(8) manual page has other usage examples.
If the hardware supports sending the command, upscmd(8) can send commands directly to the UPS. Only users with administrative rights can administer these commands. Create these users in the Extra Users field.