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The desire to run multiple operating systems was the initial motive for virtual machines, so as to allow time-sharing among several single-tasking operating systems. In some respects, a system virtual machine can be considered a generalization of the concept of virtual memory that historically preceded it.
Operating-system-level virtualization, also known as containerization, refers to an operating system feature in which the kernel allows the existence of multiple isolated user-space instances. Such instances, called containers, [ 25 ] partitions, virtual environments (VEs) or jails ( FreeBSD jail or chroot jail ), may look like real computers ...
A common implementation of this approach involves hosting multiple desktop operating system instances on a server hardware platform running a hypervisor. Its latest iteration is generally referred to as Virtual Desktop Infrastructure, or "VDI" ("VDI" is often used incorrectly to refer to any desktop virtualization implementation [2]).
A virtual machine (VM) can be more easily controlled and inspected from a remote site than a physical machine, and the configuration of a VM is more flexible. This is very useful in kernel development and for teaching operating system courses, including running legacy operating systems that do not support modern hardware. [8]
OS-level virtualization is an operating system (OS) virtualization paradigm in which the kernel allows the existence of multiple isolated user space instances, including containers (LXC, Solaris Containers, AIX WPARs, HP-UX SRP Containers, Docker, Podman), zones (Solaris Containers), virtual private servers (), partitions, virtual environments (VEs), virtual kernels (DragonFly BSD), and jails ...
These included the test software SIMMON and the CP/CMS operating system, the predecessor of IBM's VM family of virtual machine operating systems. Examples of Type-1 hypervisor include Hyper-V, Xen and VMware ESXi. Type-2 or hosted hypervisors These hypervisors run on a conventional operating system (OS) just as other computer programs do.
In computer science, storage virtualization is "the process of presenting a logical view of the physical storage resources to" [1] a host computer system, "treating all storage media (hard disk, optical disk, tape, etc.) in the enterprise as a single pool of storage." [2] A "storage system" is also known as a storage array, disk array, or filer ...
Virtual I/O systems that include quality of service (QoS) controls can also regulate I/O bandwidth to specific virtual machines, thus ensuring predictable performance for critical applications. QoS thus increases the applicability of server virtualization for both production server and end-user applications.