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What's the difference between Type 1 and Type 2 hypervisors used in OS virtualisation?
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Joe Nap, Software Engineer
Answered May 3, 2016
Refer to the wikipedia article here: Hypervisor
In general, a hypervisor is software that creates virtual machines. An operating system abstracts away the hardware and runs any type of software, including hypervisors.
A type 1 hypervisor is both the operating system and the hypervisor together. There's no underlying operating system like linux or windows. This is usually faster and more efficient because you only run 2 layers of software--the type 1 hypervisor and the virtual machine--to execute the actual virtual machine.
A type 2 hypervisor runs on top of an existing operating system, such as linux, which isn't specially designed to run virtual machines. In this case you run 3 layers of software, the operating system, the type 2 hypervisor, and the final virtual machine, in order to achieve the same effect. This is typically less efficient since you're running an entire extra layer of heavy duty software.
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