The recent thread about a customer who generated a load of 65 made me wonder how well resources are governed in a VPS. I'm thinking of common technologies like OvZ, Xen, KVM.
For disk - I don't think there's anything to guarantee or cap I/O, is there?
For memory - it's either there or it's not, right? You can oversell but ultimately if you give a VPS 512MB, that's all it can use (leaving out burst memory, swap, etc.)
So that leaves CPU. If you have an 8-core box and you give a VPS 1 core, they can max out a core's worth, but that's the limit of what they can do, right? So in theory I could be running 1 core at 100% but the other would be sitting there idle or in use by other VPSes?
Just wondering how tall the inter-VPS walls are.