Why Do We Virtualize?
Virtualization has taken the networking world by storm, but for those who have never seen virtualization, the big question has got to be: Why? Let’s talk about the benefits of virtualization. While you read this section, keep in mind two important things:
 
  A single hypervisor on a single system will happily run as many virtual machines as its RAM, CPU, and drive space allow. (RAM is almost always the main limiting factor.)
  A virtual machine that’s shut down is little more than a file (or two) sitting on a hard drive.
Power Saving
Before virtualization, each server OS needed to be on a unique physical system. With virtualization, you can place multiple virtual servers on a single physical system, reducing electrical ...

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