Virtual machines can be created, cloned, and removed from the physical hard disk space at the touch of a button without leaving any data behind. Numerous hypervisor products allow the parallel operation of different operating systems or system versions. Programmers who develop applications for different system architectures often use virtual machines for software testing. In other words: unused processor time is an unnecessary cost factor that can be avoided by switching to virtual systems.Īnother field of application for virtual environments is software development. Processors, in particular, are still expensive to buy. This concept is implemented in the context of server consolidation, as it is usually cheaper to maintain a large computing platform for different virtual systems than to operate several small computers. Instead of providing each application area of a business IT department with its own physical machine, more and more companies are moving to running mail, database, file, or application servers in isolated virtual environments on the same powerful hardware platform. Virtual machines can significantly reduce this wastage. Companies often run an extensive IT infrastructure that is idle most of the day. In a business context, virtual machines are used to reduce costs for operating and maintaining IT infrastructures. Since each guest system runs in an isolated runtime environment, processes encapsulated in a VM do not affect the host system or other systems on the same physical machine. The provision of virtual machines is the basis of shared hosting and VPS (virtual private server) setups. ![]() Compared to other virtualization concepts, VMs offer a strong encapsulation, functioning as a basis for hosting products in which several customer servers are operated on a common hardware platform. In practice, virtual machines are mostly used to isolate certain processes and applications for security reasons. Each guest system (including all programs running in it) is separated from the underlying hardware. In hardware virtualization, physical system resources can be distributed across multiple virtual systems.
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