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Here is Brendan Gregg showing how vibrations can affect disk latency:

I'm an absolute noob here, but is using SSD racks for storage a feasible option cost wise and for this issue in particular?

No, ssds are still way to expensive If you don't need the performance.

Absolutely it's an option

It's gonna cost more

But it's also going to be nearly vibration-free (just the PSU fans), and stupidly-fast