SIMMON was created and used in the IBM Product Test Laboratory for research, while the IBM Cambridge Scientific Center developed the CP-40 that was quickly implemented and released as CP-67. The first hypervisors running full virtualization were the IBM experimental tool SIMMON and the CP-40 system in the late 1960s. Ultimately, the user gets an easily scalable and reliable virtual machine, while cloud vendors maximize the utilization of their hardware resources, thus allowing them to price their services competitively. Hypervisors are fundamental in that they’re used by cloud vendors but generally operate unnoticed by end-users. Hypervisors underpin cloud computing technology by subdividing large and powerful physical machines into smaller units, which are easier to sell, maintain, and scale should the need arise.
In a hypervisor environment, the physical hardware is called the host, while the virtual machines that use the virtualized hardware resources are called guests.
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