Overreselling to KVM or OpenVZ?

Question

Network administration

What's the difference between KVM and OpenVZ? Everyone everywhere writes that OVZ is needed for overresizing, but no one writes why. What do YOU ​​think? Why can't OVERRESELLING be done on KVM?

Answer 1

yes, on both you can
just openvz these are containers, not virtualization

Answer 2

Well, it’s impossible ... It’s possible. And they write to themselves, "why?". On OpenVZ - the resources of the machine vary within the limits of "approximately FROM <-> approximately TO", on KVM they are fixed, while the processor can "eat and rape" a lot of virtual machines at once, and the disk subsystem is generally a separate conversation, it always crashes at hosters, sometimes drops to the level of "absolutely". On KVM, it will be difficult to give out "more than there" RAM, unlike OpenVZ ...
The difference is colossal in that KVM is a completely isolated environment where the entire machine is emulated. And OpenVZ is rather a "cage", where some part of the system is emulated (part of the file system, network interface, etc.), everyone works on the same core, and with the kernel parameters that the hoster pre-registered.
Yes, and at the expense of those who write that "overselling cannot be done on KVM" - they simply did not use the services of local hosters, apparently, for example, FirstVDS...

Answer 3

As on OVZ, resources on KVM will be oversold, it's just that the hoster needs to take a few more gestures for this.

Answer 4

Overselling is always there.
And you can do it on KVM too.
But on OpenVZ it is more efficient.
Better for you and your clients.