this post was submitted on 14 Jun 2024
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36
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] 1 points 4 months ago (1 children)

Dude.... you're the one that said PCIE isn't plug and play, which is incorrect. Plug and play simply means not having to manually assign IRQ/DMA/etc before using the peripheral, instead being handled automatically by the system/OS, as well as having peripherals identify themselves allowing the OS to automatically assign drivers. PCIE is fully plug-and-play compatible via ACPI, and hot swapping is supported by the protocol, if the peripheral also supports it.

[–] [email protected] -1 points 4 months ago (1 children)

Again...it is not. You can't just go and unplug swap anything anywhere into a PCIE slot. The protocol supports it, but it is not by any definition any sort of live swappable by default.

My speedometer says 200, but my car does not go that fast.

An egg isn't an omelet.

The statement "humans can fly" is technically true, but not without a plane.

A device that supports hot swap into a compatible and specifically configured slot could be though.

I can keep going forever with this.

[–] [email protected] -1 points 4 months ago (1 children)

Are you slow? nobody is arguing that you can hot swap a GPU. That's not what people are correcting you on.

YOU claimed that PCIE is not PLUG AND PLAY

NO. PCIE is not plug and play.

That was your comment. It was wrong. You were wrong.

[–] [email protected] 0 points 4 months ago

And it still is not.