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The Lounge War Stories Wrong Array... Post 303026919 by bakunin on Wednesday 5th of December 2018 06:57:18 AM
Here is my personal "power-loss-story" and it has nothing to do with a power-button:

Back around 2000 i was working for a data center, which - nothing really unusual - had a large ~1000hp diesel generator to back up its UPS. This diesel was tested every year once by switching it on for 2 minutes. Everything worked fine.

Now, what happens if you run such a system for two minutes a year? Disaster struck and showed to the responsible people exactly what happens in such a case: during a heavy thunderstorm the nearby transformer station (or, specifically, its large 6m-diameter capacitor was hit by a lightning. The whole area was suddenly without electrical current and the remains of the capacitor lay across half of the street in pieces not bigger than a few centimeters each.

First, our UPS kicked in - as planned. Then, when the UPS batteries went low, the diesel started. It ran for about 5-6 minutes, then stuck with a piston seizure because running keeps such a machine lubed. When it doesn't run all the bearings eventually run dry of oil. So far, so bad and our data center stood without electrical power.

What makes the story interesting, though, is: at the same time adear friend of mine (shockneck) worked for another data center across the street. So, two days after the incident, we sat in a cafe commiserating about life as an admin. And he told me, they had a UPS, backed by a diesel. And because they knew that engines have to run every now and then to remain properly lubed they switched it on every month and let it run for 10 minutes. Alas, their diesel gave up a few minutes after starting. You know, when letting it run so often you need to refill the tank now and then.....

bakunin
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SAFENET(8)							    NUT Manual								SAFENET(8)

NAME
safenet - Driver for SafeNet compatible UPS equipment NOTE
This man page only documents the hardware-specific features of the safenet driver. For information about the core driver, see nutupsdrv(8). SUPPORTED HARDWARE
This driver supports UPS equipment which can be controlled via SafeNet v1.0 for Windows (serial interface only). EXTRA ARGUMENTS
This driver supports the following optional settings in the ups.conf(5) file: manufacturer=value Autodetection of this parameter is not possible yet (and it probably never will be). Therefore, this user-defined string accepts any name. The default is unknown. modelname=value Like manufacturer above. The default is unknown. serialnumber=value Like manufacturer above. The default is unknown. ondelay=value Time to wait before switching on the UPS (minutes). Defaults to 1 minute. offdelay=value Time to wait before shutting down the UPS (seconds). Defaults to 30 seconds. UPSCMD
This driver supports some instant commands (see upscmd(8)): test.battery.start Start UPS self test test.battery.stop Cancel UPS self test test.failure.start Start simulated power failure test.failure.stop Cancel simulated power failure beeper.enable Enable the UPS beeper beeper.mute Temporarily mute the UPS beeper beeper.toggle Toggle the UPS beeper shutdown.return Turn off the load and wait for the power to return. Uses the timer defined by offdelay. shutdown.reboot Turn off the load and return. Uses the timers defined by offdelay and ondelay. KNOWN PROBLEMS
If you run the shutdown.return command with mains present, the output may stay on or switch off and not back on again. The shutdown.reboot command will unconditionally switch on the load again (with or without mains present). If the driver is called with the -k option (or through upsdrvctl shutdown) it tries to detect which command should be used in an attempt to stay off until mains is present again or to cycle the output if the power returned in the mean time. This isn't bullet-proof, and you should be prepared that the power will either not be shutdown, or that it doesn't return when the power comes back. AUTHOR
Arjen de Korte <adkorte-guest at alioth.debian.org> SEE ALSO
The core driver: nutupsdrv(8) Internet resources: The NUT (Network UPS Tools) home page: http://www.networkupstools.org/ Network UPS Tools 05/21/2012 SAFENET(8)

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