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UPS: how to turn the server back on? (lemmy.world)

submitted 2 weeks ago* (last edited 2 weeks ago) by peregus@lemmy.world to c/homelab@lemmy.ml

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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!

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[–] digdilem@lemmy.ml 7 points 2 weeks ago (10 children)

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.

[–] peregus@lemmy.world 2 points 2 weeks ago (9 children)

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.

[–] bri@lemmy.ml 2 points 2 weeks ago (1 children)

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.

[–] peregus@lemmy.world 1 points 2 weeks ago

Negative, it's "just" an HP Elitebook with a PCIe SFP+ board.

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