Why is KVM more often used in production than Openvz?

Question

OpenVZ

I'm trying to understand: what are the pitfalls of openvz. (yes, I understand that comparing containers and virtualization is not a camelfo, I am aware that openvz containers use one io and a kernel with a host system). But this does not negate the fact that openvz uses system resources more productively than virtual machines and hypervisors (KVM, Xen).

Answer 1

openvz uses system resources more productively than virtual machines and hypervisors (KVM, Xen)

The TK may have other requirements than high productivity: high isolation of the host system from the hypervisor, Windows as the host system, as noted in the comment, there may be a requirement to run docker / lxc containers in the virtual machine (I personally saw such a perversion), ...
There were articles about problems with openvz containers when updating the system software of the resource system.

I'm trying to understand: what are the pitfalls of openvz.

For this and not only, you can use the search in the formats: fuckin openvz or trouble openvz.
In general, what do you need?

Answer 2

There are no special problems now, more or less licked the mail release, you can usability in production

Answer 3

will Windows work as a guest?

Answer 4

Super productions use XEN, take Websence products or any others. If you need it for free - XCP-ng!