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It initially ran on the System/360 and System/370 class mainframe machines, starting with the System 360 Model 67; later it was moved to the System/390 and zSeries machines. It was originally called CP-67 when it first appeared, and was later renamed VM/370, VM/390, etc. It has recently been renamed z/VM.
(Technically, the operating system is called CP, for "Control Program", and the term VM is often shorthand for VM/CMS, a complete package with other software, including CMS.)
VM is named for its ability to run software in virtual machines which are isolated from each other; each user has the illusion of using a complete computer and can use their own operating system on this "private" computer.
Not all VM virtual machines have to run CMS, though; initially, some sites preferred to run some form of OS/360 (or later MVS) in one or more virtual machines, to provide traditional batch processing services to those users who wanted that.
Other operating systems that can now be run in virtual machines under VM include DOS, MVS, VM itself, Unix, and MUSIC ; on some systems which are used as WebThe World Wide Web (the Web or WWW for short) is a distributed hypertext system that operates over the Internet. Basic terms Hypertext is viewed using a program called a web browser which retrieves pieces of information, called "documents" or " web pages" serverThis article is about computer servers. For the food service use, see waiter. In computing, a server is: A computer software application that carries out some task on behalf of users. This is usually divided into file serving, allowing users to store ands, the operating system run in the many virtual machines is LinuxThis article is about Linux-based operating systems, GNU/Linux, and related topics. See Linux kernel for the kernel itself. See Linux (washing powder) for the Swiss brand of washing powder. Tux, a plump penguin, is the official Linux mascot Linux is the n.
The version of Linux used is called Linux/390, and has been largely developed by IBM. Running many hundred copies of Linux simultaneously on different virtual machines has the advantage that Linux operating system crashes (rare in themselves) only affect a single virtual machine and can be easily recovered from, while the overall system keeps running.
The initial version made available to customers, CP-67, provided multiple virtual System 360 machines, although they did not have support for simulated virtual memoryVirtual memory is a computer design feature that permits software to use more memory than the computer physically possesses. In technical terms, it allows software to run in a memory address space whose size and addressing are not necessarily tied to the. It was not a true full virtual machine, though, because you could not run CP-67 under CP-67.
The next version, VM/370, announced in 19721972 is a leap year starting on Saturday (click link for calendar). Events January events January 2 the Pierre Hotel Heist Six men rob the safety deposit boxes of the Pierre Hotel in New York City. Loot is at least $4 million January 5 President of the Un, not only provided emulated virtual memory, but also provided such an exact emulation of the underlying hardware that it could support itself. (IBM debugged new versions of VM/370 by running it under VM/370. In fact, development of all operating systems for the System 370 relied heavily on VM/370, running on System 360 Model 67 hardware.)