virtual machine monitor (VMM)

A virtual machine monitor (VMM) is a host program that allows a single computer to support multiple, identical execution environments. All the users see their systems as self-contained computers isolated from other users, even though every user is served by the same machine. In this context, a virtual machine is an operating system (OS) that is managed by an underlying control program. For example, IBM's VM/ESA can control multiple virtual machines on an IBM S/390 system.

In Microsoft Virtual Server 2005, Virtual Machine Monitor is the proprietary name for a kernel-mode driver that functions as a firewall between the host OS and the virtual machines. It can prevent any single program, running in one of the virtual machines, from overusing the resources of the host OS.

This was last updated in October 2006
Posted by: Margaret Rouse
View the next item in this Essential Guide: VMware vCenter Operations Management Suite or view the full guide: The VMware infrastructure monitoring encyclopedia

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