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Yet again. Microsoft acquired Connectix Corporation, a provider of virtualization software for Windows and Macintosh based computing, in early 2. In late 2. 00. 3, EMC announced its plans to acquire VMware for 6. Shortly afterwards, VERITAS announced that it was acquiring an application virtualization company called Ejascent for 5. Sun and Hewlett Packard have been working hard in recent times to improve their virtualization technologies. IBM has long been a pioneer in the area of virtual machines, and virtualization is an important part of IBMs many offerings. There has been a surge in academic research in this area lately. This umbrella of technologies, in its various connotations and offshoots, is hot, yet again. The purpose of this document can be informally stated as follows if you were to use virtualization in a an endeavor research or otherwise, here are some things to look at. Christopher Strachey published a paper titled Time Sharing in Large Fast Computers in the International Conference on Information Processing at UNESCO, New York, in June, 1. Later on, in 1. 97. Donald Knuth that. I did not envisage the sort of console system which is now so confusingly called time sharing. Strachey admits, however, that time sharing as a phrase was very much in the air in the year 1. The use of multi programming for spooling can be ascribed to the Atlas computer in the early 1. The Atlas project was a joint effort between Manchester University and Ferranti Ltd. In addition to spooling, Atlas also pioneered demand paging and supervisor calls that were referred to as extracodes. According to the designers 1. Supervisor extracode routines S. E. R. s formed the principal branches of the supervisor program. They are activated either by interrupt routines or by extracode instructions occurring in an object program. A virtual machine was used by the Atlas supervisor, and another was used to run user programs. In the mid 1. 96. IBM Watson Research Center was home to the M4. X Project, the goal being to evaluate the then emerging time sharing system concepts. The architecture was based on virtual machines the main machine was an IBM 7. M4. 4 and each virtual machine was an experimental image of the main machine 4. X. The address space of a 4. X was resident in the M4. IBM had provided an IBM 7. MIT in the 1. 95. It was on IBM machines that the Compatible Time Sharing System CTSS was developed at MIT. The supervisor program of CTSS handled console IO, scheduling of foreground and background offline initiated jobs, temporary storage and recovery of programs during scheduled swapping, monitor of disk IO, etc. The supervisor had direct control of all trap interrupts. Around the same time, IBM was building the 3. MITs Project MAC, founded in the fall of 1. MIT Laboratory for Computer Science. Project MACs goals included the design and implementation of a better time sharing system based on ideas from CTSS. This research would lead to Multics, although IBM would lose the bid and General Electrics GE 6. Regardless of this loss, IBM has been perhaps the most important force in this area. A number of IBM based virtual machine systems were developed the CP 4. IBM 3. 604. 0, the CP 6. IBM 3. 606. 7, the famous VM3. Typically, IBMs virtual machines were identical copies of the underlying hardware. A component called the virtual machine monitor VMM ran directly on real hardware. Multiple virtual machines could then be created via the VMM, and each instance could run its own operating system. IBMs VM offerings of today are very respected and robust computing platforms. Robert P. Goldberg describes the then state of things in his 1. Survey of Virtual Machines Research. He says Virtual machine systems were originally developed to correct some of the shortcomings of the typical third generation architectures and multi programming operating systems e. OS3. 60. As he points out, such systems had a dual state hardware organization a privileged and a non privileged mode, something thats prevalent today as well. In privileged mode all instructions are available to software, whereas in non privileged mode they are not. The OS provides a small resident program called the privileged software nucleus analogous to the kernel. User programs could execute the non privileged hardware instructions or make supervisory calls e. SVCs analogous to system calls to the privileged software nucleus in order to have privileged functions e. IO performed on their behalf. While this works fine for many purposes, there are fundamental shortcomings with the approach. Consider a few. Only one bare machine interface is exposed. Therefore, only one kernel can be run. Anything, whether it be another kernel belonging to the same or a different operating system, or an arbitrary program that requires to talk to the bare machine such as a low level testing, debugging, or diagnostic program, cannot be run alongside the booted kernel. One cannot perform any activity that would disrupt the running system for example, upgrade, migration, system debugging, etc. Air Shields C300 Service Manual. One also cannot run untrusted applications in a secure manner. One cannot easily provide the illusion of a hardware configuration that one does not have multiple processors, arbitrary memory and storage configurations, etc. We shall shortly enumerate several more reasons for needing virtualization, before which let us clarify what we mean by the term. A Loose Definition. Let us define virtualization in as all encompassing a manner as possible for the purpose of this discussion virtualization is a framework or methodology of dividing the resources of a computer into multiple execution environments, by applying one or more concepts or technologies such as hardware and software partitioning, time sharing, partial or complete machine simulation, emulation, quality of service, and many others. Note that this definition is rather loose, and includes concepts such as quality of service, which, even though being a separate field of study, is often used alongside virtualization. Often, such technologies come together in intricate ways to form interesting systems, one of whose properties is virtualization. In other words, the concept of virtualization is related to, or more appropriately synergistic with various paradigms. Consider the multi programming paradigm applications on nix systems actually almost all modern systems run within a virtual machine model of some kind. Since this document is an informal, non pedantic overview of virtualization and how it is used, it is more appropriate not to strictly categorize the systems that we discuss. Even though we defined it as such, the term virtualization is not always used to imply partitioning breaking something down into multiple entities. Here is an example of its different intuitively opposite connotation you can take N disks, and make them appear as one logical disk through a virtualization layer. Grid computing enables the virtualization ad hoc provisioning, on demand deployment, decentralized, etc. IT resources such as storage, bandwidth, CPU cycles,. PVM Parallel Virtual Machine is a software package that permits a heterogeneous collection of Unix andor Windows computers hooked together by a network to be used as a single large parallel computer. PVM is widely used in distributed computing. Colloquially speaking, virtualization abstracts out things. Why Virtualization A List of Reasons. Following are some possibly overlapping representative reasons for and benefits of virtualization. Virtual machines can be used to consolidate the workloads of several under utilized servers to fewer machines, perhaps a single machine server consolidation.