Virtualization%20Technologies

Virtualization%20Technologies - CSC405 Introduction to...

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CSC405 Introduction to Computer Security Fall 2007 1 Virtualization Technologies What is Virtualization? Virtualization is the concept of decoupling the hardware from the operating systems and applications. This can be implemented a number of ways as we will discuss, but fundamentally it is achieved by inserting a layer between the server hardware and software components and to provide either the necessary interfaces, or a simulation of one component to the other. http://www.redbooks.ibm.com/redpieces/pdfs/sg247190.pdf In computing, virtualization is a broad term that refers to the abstraction of computer resources. http://en.wikipedia.org/wiki/Virtualization In essence, virtualization lets you transform hardware into software. Use software such as VMware ESX Server to transform or “virtualize” the hardware resources of an x86-based computer—including the CPU, RAM, hard disk and network controller—to create a fully functional virtual machine that can run its own operating system and applications just like a “real” computer. http://www.vmware.com/virtualization/ My favorite In its simplest form, virtualization refers to the capability of being able to run multiple operating system instances, such as Linux® and Windows®, on a physical server. http://www.redbooks.ibm.com/redpieces/pdfs/sg247190.pdf
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CSC405 Introduction to Computer Security Fall 2007 2 History of Virtualization The history of virtualization technology goes back further than most people might think. In fact the idea of virtualization was first discussed as far back as the late 1950’s. The following will attempt to chronicle the significant events that occurred from the early 1960’s. Throughout today and the impact that each had on x86 server virtualization. In the early 1960’s, IBM introduced Time Sharing which was the original driving force behind virtualization. Today, many people associate time sharing with mainframe computers, but arguably x86 could be headed in this direction under the name On-Demand Computing. In 1964, IBM introduced the IBM System/360, which provided limited virtualization capabilities and was architected by the legendary Gene Amdahl. Later in 1964, the CP-40 was released and gave way to the first mentions of Virtual Machines and Virtual Memory. In 1965, the System/360 Model 67 and TSS (Time Sharing System) were developed. This was followed in 1967 by another release of CP-40 and CMS, which put into production a system supporting 14 VMs each having 256K of Virtual Memory. A new iteration of the CP-40 was called CP-67 Version 1 debuted in 1968. This provided a much needed boost in both performance and stability to CP-40. CP-67 Version 3 had free storage sub port support which provided additional performance and the addition of SLT instruction. Finally in 1971, Version 3.1 of CP-67 was released with high speed I/O enhancements.
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