Virtualization Cloud Computing

As early as the mid-1960s, something was going on that would later prove to be fundamental to the development of cloud computing. The IBM S/ 360-67, supporting up to four processors, was announced in 1965. It had some unique instructions to support dynamic address translation (DAT) to enable efficient paging. While it was released with an operating system called TSS to support time sharing (slowly and expensively), the real breakthrough occurred in IBM’s Cambridge Scientific Center, closely aligned with nearby Massachusetts Institute of Technology, where CP (control program) was developed to support virtualization.

Growth of Internet hosts, 1981–2009.

Growth of Internet hosts, 1981–2009.

IBM 360 Model 67.

IBM 360 Model 67.

CP provided each user with a simulated (virtual) standalone System/ 360 computer, able to run any S/360 software that ran on the bare machine. This gave each user what was, in effect, a private computer system. Its latest grandson, z/VM, now called a hypervisor in common with standard industry usage, is still in active use on zSeries, System z9, and System z10 computers. z/VM can be used to support thousands of Linux virtual machines using a process known as virtualization. Its most recent release, V6.1 (at this writing), debuted in October 2009. According to IDC, Linux on Power and Linux on System z customers achieved on average a 6.3 month payback on their initial investment, including the initial system purchase. Virtualization is a key technology in cloud computing.


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