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Can a System Handle Brown/Blackouts on only the GPU? (infosec.pub)

submitted 4 months ago by [email protected] to c/[email protected]

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I am planning to build a multipurpose home server. It will be a NAS, virtualization host, and have the typical selfhosted services. I want all of these services to have high uptime and be protected from power surges/balckouts, so I will put my server on a UPS.

I also want to run an LLM server on this machine, so I plan to add one or more GPUs and pass them through to a VM. I do not care about high uptime on the LLM server. However, this of course means that I will need a more powerful UPS, which I do not have the space for.

My plan is to get a second power supply to power only the GPUs. I do not want to put this PSU on the UPS. I will turn on the second PSU via an Add2PSU.

In the event of a blackout, this means that the base system will get full power and the GPUs will get power via the PCIe slot, but they will lose the power from the dedicated power plug.

Obviously this will slow down or kill the LLM server, but will this have an effect on the rest of the system?

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[–] [email protected] 1 points 4 months ago

Yeah NUT is the package I've been looking at, and looks decently integrated into NixOS just, getting around to configuring it is another time sink.

My 1920R and an unused 15A Dell rackmount (h967n maybe) came with my rack, I've got no reason to have two UPS running nor do I want to replace the batteries in another UPS or have a 15A socket installed in the house just yet. But man it's tempting to piggy-back it off the 1920R for shits and giggles.

Waiting on some parts to arrive from AliExpress - once they arrive I'll be able to decommission one of my servers and have all my services running off one board.