KVM vs OpenVZ Virtualization: Why Hypervisor Choice Matters

Understanding KVM Virtualization

**KVM (Kernel-based Virtual Machine)** is a full virtualization hypervisor. It turns the Linux kernel into a bare-metal hypervisor, allowing each guest virtual machine to run its own isolated kernel instance. Because of this, KVM servers can run any operating system with dedicated virtual hardware allocations.

Understanding OpenVZ Virtualization

**OpenVZ** is an operating-system-level virtualization hypervisor. In this setup, all guest virtual containers share the same underlying parent host operating system kernel. While OpenVZ is lightweight and efficient, it does not allow you to run custom kernels, deploy Windows operating systems, or run complex kernel mods.

"KVM virtualization operates as a strict hardware isolator, preventing hosting providers from over-selling their physical hardware, whereas OpenVZ relies on dynamic sharing of the host kernel."

KVM vs OpenVZ: Main Advantages

• Guaranteed Memory (RAM): KVM completely reserves your RAM quota. On OpenVZ, providers can over-commit the physical memory, which can lead to random process termination when resources run tight.
• Kernel Freedom: KVM guest containers can compile custom kernel modules and deploy advanced security structures at the system level.
• No Resource Throttling: Your CPU cores are locked to your container, ensuring consistent performance.

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