What is the difference between KVM and OpenVZ?
KVM is true virtualization where the VPS operates as its own server, independently of the host node. OpenVZ is a container style of virtualization which relies on the host node's kernel. KVM has no restrictions in terms of functionality, but it has more overhead than OpenVZ. OpenVZ is constrained by the host node kernel, but it has less overhead in the containers themselves. KVM is generally more stable than OpenVZ.
KVM is not a dedicated environment. Both virtualizations share host CPU and network port among all VPSs.
KVM OpenVZ CPU Performance X Network Performance X (with virtio) Disk Performance X (with virtio) Can upgrade distribution version without reinstall X Can use Windows/BSD X Can change kernel X Can use application containers (Docker, etc.) X
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