Kinds of Server Virtualization

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Each system uses a different approach to allocate physical server resources to virtual server needs. There are Three kinds of Virtualization:
  • Full Virtualization uses a special kind of software called a hypervisor. The hypervisor interacts directly with the physical server's CPU and disk space. It serves as a platform for the virtual server's operating systems. The hypervisor keeps each virtual server completely independent and unaware of the other virtual servers running on the physical machine. Each guest server runs on its own OS - you can even have one guest running on Linux and another on Windows.
    • The hypervisor monitors the physical server's resources. As virtual servers run applications, the hypervisor relays resources from the physical machine to the appropriate virtual server. Hypervisors have their own processing needs, which means that the physical server must reserve some processing power and resources to run the hypervisor application. This can impact overall server performance and slow down applications.
  • The Para-Virtualization approach is a little different. Unlike the full virtualization technique, the guest servers in a para-virtualization systems are aware of one another. A para-virtualization hypervisor doesn't need as much processing power to manage the guest operating systems, because each OS is already aware of the demands of the other operating systems which are placed on the physical server. The entire system works together as a cohesive unit.
  • An OS-level Virtualization approach doesn't use a hypervisor at all. Instead, the virtualization capability is part of the host OS, which performs all the functions of a fully virtualized hypervisor. The biggest limitation of this approach is that all the guest severs must run the same OS. Each virtual server remains independent from all the others, but you can't mix and match operating systems among them, because, all the guest operating systems must be the same, this is called a homogeneous environment.

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