In today’s world, we have high demand of having multiple operating systems or a server or even a multiple storage devices and so on. Therefore to fulfill these needs, we cannot physically have these in multiple quantities; therefore, the concept of virtualization was introduced.
With the help of virtualization, a single hardware can be divided into multiple operating systems, storage devices, network resource, etc. and hence fulfilling the requirement of multiple users.
An essential requirement for cloud computing is the ability of a single physical machine to run multiple virtual machines on it. This is attained through virtualization, where multiple computers appear to be a single one. It is impossible physically to create multiple processors as this will require scheduling under the same machine. Thus, virtualization caters with a higher degree of virtualization. Virtualization offers low cost virtualization, along with support for heterogeneous environment.
Hypervisor is a software which creates and runs virtual machines. The computer running the hypervisor is called the host machine, while each virtual machine running on it is called the guest machine. Hypervisor manages resource allocation and the memory mapping between the guest machine and the host operating system (OS).
It is also known as a manager of a virtual machine. Hypervisor software may vary for different operating system, but the basic function will always be to transform a single hardware into multiple virtual machines. Hypervisor software controls the host machine automatically by allocating the required processor, memory or other resources to all guest operating systems that are running on the host computer without any fails or any problem.
There are two types of hypervisor, they are as follows:
has direct access to all the hardware and installs directly on the computer. Type 1 hypervisors cater resource management and provide complete advantage of portability and abstraction of hardware while running multiple virtual machines.
also cater the execution of multiple virtual machines but it does not provide direct access to the hardware, which ultimately incurs more cost in running the guest OS. So, in type 2 hypervisor the guest OS does not run at its full potential.
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