The Long Road To Virtualization

For the past decade the topic of virtualization has been echoed across a broad range of industries

, from video processing to health care, flight simulation and enterprise computing. While it's often touted as a modern day miracle of technology, the roots of virtualization go back to the 1960's when IBM developed the first virtualization platforms as a way to logically partition mainframe computer systems in a fashion that would create a number of "virtual" machines.

This was the advent of multi-tasking, in which one computer could run multiple applications at the same time and serve hundreds of users. "Time-sharing" was the buzz word of the day, as the expense of such mainframes required very high utilization rates to justify the cost. In this way, small businesses lacking the resources to afford their own mainframe could still gain access to this computing power by paying for just the time they used.

Personal computers made their way into companies during the 1980's, and though initially limited in effectiveness due to their stand-alone nature, that situation soon changed with the advent of local area networks. Deployment of these networks provided the necessary framework for development of client- server applications as a way to centralize data yet distribute processing power to the desktop. It was a radical shift in how data was created, stored and utilized, but the architecture was far from perfect.

As it turns out, the client-server paradigm didn't scale very well, as the cost of deploying separate servers for each application became a costly proposition for most companies. Racks of these dedicated servers were built to handle the workload, but as user counts and the need for processing power and mass data storage increased, IT departments found themselves in constant upgrade mode.

The main problem, however, was really one of utilization. As with automobile traffic on the highway, or electricity usage within a community, there are peaks and valleys in computing demand, which required companies to provide enough processing power to handle peak demand on each of their many servers, even if the majority of the time these servers were underutilized. So how did we eventually get out from under the dilemma of client-server computing?

In part two we'll examine how the rebirth of virtualization technology on x86 hardware platforms saved the day, and continues to shift the landscape of mission critical computing.

The Long Road To Virtualization

By: Mark Lovett

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