8.7. Hypervisor ( Specialized Cloud Mechanisms Unit 3 chapter 1)

8.7. Hypervisor
The hypervisor mechanism is a fundamental part of virtualization infrastructure that is primarily used to generate virtual server instances of a physical server. A hypervisor is generally limited to one physical server and can therefore only create virtual images of that server (Figure 8.27). Similarly, a hypervisor can only assign virtual servers it generates to resource pools that reside on the same underlying physical server. A hypervisor has limited virtual server management features, such as increasing the virtual server’s capacity or shutting it down. The VIM provides a range of features for administering multiple hypervisors across physical servers.

Figure 8.27. Virtual servers are created via individual hypervisor on individual physical servers. All three hypervisors are jointly controlled by the same VIM.
Hypervisor software can be installed directly in bare-metal servers and provides features for controlling, sharing and scheduling the usage of hardware resources, such as processor power, memory, and I/O. These can appear to each virtual server’s operating system as dedicated resources.
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