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Solved
ReadyNAS Ultra 4 BIOS
The last post in this thread says that ReadyAS resolved their problem by changing an option in the BIOS. The ReadyNAS Ultra 4 (RNDU4000) does not have a VGA header on the motherboard. It does have ...
BfloEagle wrote:
Before anyone suggests a UPS... The UPS I have (unfortunately) does not play nice with NUT. NUT can shutdown everything (including this NAS and the UPS itself) but the UPS restarts itself automatically a few seconds after turning off the load... So the power is cut to the RNDU4000, but then comes back even though the UPS is still running on battery... Which then means it will crash hard when those batteries are drained a minute or two later since everything else was already shutdown including the switch between it and the NUT Master server itself...
NUT does not control how or why the UPS shuts down or turns back on. It simply monitors the UPS (or another machine that's monitoring the UPS) to determine when to shut down the NAS. If your UPS is behaving in this manner, it's either broken or some internal setting is wrong. Turning off the NAS would change the time it would take for the battery to drain, but it should not result in an UPS restart, and that's what it sounds like is happening. An unmonitored UPS is just barely better than no UPS at all -- it will get you through quick power events but you are at risk with longer ones.
On the other hand, are you sure the UPS is what's re-starting, and not the NAS? Maybe there is something mis-configured or broken in the NAS where the NAS is doing a restart, not a power-down. You could test this by connecting the NAS to mains power and unplugging the UPS till it signals the NAS to shut down. If the NAS just power cycles, not powers down, the problem is with the NAS.
As for using the serial port, I have to assume that's what the other user did. The Pro4, Ultra4Plus, and Ultra4 all have the same motherboard, and it has no VGA header. If there is a tool for setting options on your NAS, you may also be able to set it up so it does not come back on.
Somehow, BfloEagle 's latest post disappeared. I typed in a reply to that, and trying to post it resulted in "Message not found". Nowq IO posted this, and his is there again,
The situation appears to be a bit different than you described, though the result is the same. The UPS does not "power back on", it has not yet shut down and turns back on the switch to the NAS. Can you simply configure it such that it never turns it off, even if that means plugging it into a different UPS outlet?
If the UPS is basically a combination UPS and PDU, also make sure you have no ping-based reset that may be the culprit.
I'll give it a shot. Not sure if a NUT Master itself can ignore a low battyery signal (override.battery.charge.low = -1 maybe??). It's a raspberryPi so if it does not shut down gracefully, I'm not that worried... Everything else on the UPS will either be shutdown by that point or are not impacted by hard power cuts (switches).
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