I’ve installed an APC BX950MI-GR and connected it to my Proxmox server via USB.
It works: it turns off the server after x minutes after the power loss and it gets turned off by the command upsdrvctl shutdown, when the powers come back on, the UPS turns on and so does the server.
The problem is if the power comes back after the server receive the power off signal and before the UPS powers off, in this case the UPS simply goes back in the normal state and the server…stays off.
How can I turn it back on?
Thanks!
What’s an average power outage duration?
I’d look at changing the shutdown command from
shutdownto something likertcwake -s 3600to restart the server in … 1 hour?You will probably need to play with that command a bit, but I use it for my NAS to autostart at certain times of the day.
It depends, usually just some minutes, but during the summer it could be more. I’d like (the ideal result) to find a way that just works in any case.
Yeah, I get that… I’d be the same
So… are you shutting down after x minutes, or, NUT’s signalling to shutdown when the battery is getting low, which is x minutes. (If you see my point) - if the battery still has plenty of capacity, maybe extend the runtime and that might be enough to ride through at least some outages?
In all seriousness though this is actually a really good question, and something I never realized, but do also face myself with my setup!
You would need a third device monitoring both for this edge case. Once the server has been told to shut down, it’s going to shut down.
The third device (also on the UPS, like an Rpi or ESP) can then check for power availability through the UPS and whatever logic you want to apply, can then use wake on lan to the server to power it up once it shuts down.
I did think about that option, but the onboard NIC is connected to the ONT (fiber connection) and the SFP+ is off when the server is off so it can’t receive WOL packets. By the way, thanks.
If you’ve got SFP+ onboard it sounds like you have a relatively serious server. Does it have IPMI? You could have a low power device like a Pi issue and IPMI command to power on.
Negative, it’s “just” an HP Elitebook with a PCIe SFP+ board.
You have no local network access to it at all? (WOL will work across the subnet, you don’t need to connect directly to it)
If genuinely not (and I’d be surprised if that is the case) add another nic of any sort (cheap) for WOL, or use something like Switchbot?
Only through SFP+ I think that the only option would be to add a second NiC. Thanks!
Can you add a second NIC? Should be able to find a Gigabit one for less than $15 or a 2.5Gbps one for $25-40.
