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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]

33 comments fedilink hide all child comments

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] 11 points 4 months ago (1 children)

This is a terrible idea, no really.

Any system that shares power and grounds (i.e. on the same bus), keep on the same power supply/domain.

Even, if!!!!, it doesn't fry your computer when one power system goes off but the other stays on - the system will absolutely not be stable, and will behave in unexpected ways.

DO NOT DO THIS.

[–] [email protected] 3 points 4 months ago

There computer:

gif