Definitely worth looking into for my next ESXi project (coming this summer):
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one day imma be able to buy a proper god tier hardware and on that day i'll be able to play with these shenanigans
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Not sure this will work if you have a VM with a passthrough PCI device. ESXI makes you reserve RAM if you passthrough a device. The only time I tried hot plug CPU was on a windows 10 VM and it caused stability issues for me. It did seem to resolve by rebooting the VM but kind of defeats the purpose.