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Configuring UPS support for single or multiple FreeNAS servers

Great job.
Excellent resource. My systems are now all in sync, thanks to the "LISTEN" parameter. Love the ability to test without actually going on battery. Great job!
Straight path from A to B to C and UPS is up and running, shutdown sequence tested. Thank you for a compact guide.
Thank you! This helped me set up my UPS. My specific UPS wasn't listed in the dropdown (Cyber Power PR1500LCDRT2U), but selecting a different model with the "usbhid-ups" driver did the trick. Next step - configuring the 2nd UPS I have. My server has redundant power supplies, which I have plugged into separate UPSs. (Which are plugged into separate power circuits.) Looks like I may need to manually edit some config files to get that working.
End to end explained UPS configuration, also covers the subject of testing the setup (which isn't discussed anywhere else on the internet, AFAIK).