Cloud Computing: Virtualization Technology (1)--Introduction

What is Virtualization

Virtualization means that computer components run on a virtual basis rather than on a real basis. Virtualization technology can increase the capacity of the hardware and simplify the reconfiguration process of the software. The virtualization technology of CPU can simulate multiple CPUs in a single CPU, allow a platform to run multiple operating systems simultaneously, and the application can operate in separate space without affecting each other, thereby significantly improving the efficiency of the computer.

Introduction to several kinds of virtualization software

RedHat KVM

Virtualization Mode: Full Virtualization

Architecture: Alien Architecture (Linux kernel); Naked metal structure rhev-h

Features: Naked metal architecture rhev-h or support semi-virtualized virtio on key hard drives and network adapters to achieve optimal performance.

I/O stack: KVM reuses the entire Linux I/O protocol stack, so KVM users naturally get the latest driver and I/O protocol stack improvements.

Schema diagram:

VmWare ESX

Virtualization Mode: Full Virtualization

Structure: Bare Metal structure

I/O protocol stack: VMware chooses performance, but puts the I/O stack in the hypervisor. Unfortunately, VMware Kernel is proprietary, which means that VMware has to develop and maintain the entire stack, resulting in slower development, and your hardware may have to wait a while for VMware's support.

Schema diagram: