![]() ![]() Although hardware is consolidated in virtual environments, typically OSs are not. In the case of server consolidation, many small physical servers can be replaced by one larger physical server to decrease the need for more (costly) hardware resources such as CPUs, and hard drives. ![]() Virtualization often exacts performance penalties, both in resources required to run the hypervisor, and as well as in reduced performance on the virtual machine compared to running native on the physical machine. Guests are often restricted from accessing specific peripheral devices, or may be limited to a subset of the device's native capabilities, depending on the hardware access policy implemented by the virtualization host. Access to physical system resources (such as the network access, display, keyboard, and disk storage) is generally managed at a more restrictive level than the host processor and system-memory. The guest software executes as if it were running directly on the physical hardware, with several notable caveats. ![]() The guest software is not limited to user applications many hosts allow the execution of complete operating systems. Platform virtualization is performed on a given hardware platform by host software (a control program), which creates a simulated computer environment, a virtual machine (VM), for its guest software. The creation and management of virtual machines has also been called "platform virtualization", or "server virtualization", more recently. The term "virtualization" was coined in the 1960s to refer to a virtual machine (sometimes called "pseudo machine"), a term which itself dates from the experimental IBM M44/44X system. JSTOR ( May 2023) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Hardware virtualization" – news Please help improve this section by adding citations to reliable sources. ![]()
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