Mainframes can find new life hosting private clouds

With a bit of touching up and reconfiguring, a mainframe can be an easy and cost-effective way to host a private cloud

By Tam Harbert | Computerworld

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Mention cloud computing to a mainframe professional, and he'll likely roll his eyes. Cloud is just a much-hyped new name for what mainframes have done for years, he'll say.

"A mainframe is a cloud," contends Jon Toigo, CEO of Toigo Partners International, a data management consultancy in Dunedin, Fla.

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If you, like Toigo, define a cloud as a resource that can be dynamically provisioned and made available within a company with security and good management controls, "then all of that exists already in a mainframe," he says.

Of course, Toigo's isn't the only definition of what constitutes a cloud. Most experts say that a key attribute of the cloud is that the dynamic provisioning is self-service -- that is, at the user's demand.

But the controlled environment of the mainframe, which is the basis for much of its security, traditionally requires an administrator to provision computing power for specific tasks. That's why the mainframe has a reputation as old technology that operates under an outdated IT paradigm of command and control.

It's also one of the reasons why most cloud computing today runs on x86-based distributed architectures, not mainframes. Other reasons: Mainframe hardware is expensive, licensing and software costs tend to be high, and there is a shortage of mainframe skills.

Nevertheless, mainframe vendors contend that many companies want to use their big iron for cloud computing. In a CA Technologies-sponsored survey of 200 U.S. mainframe executives last fall, 73 percent of the respondents said that their mainframes were a part of their future cloud plans.

And IBM has been promoting mainframes as cloud platforms for several years. The company's introduction last year of the zEnterprise, which gives organizations the option of combining mainframe and distributed computing platforms under an umbrella of common management, is a key part of IBM's strategy to make mainframes a part of the cloud, say analysts.

The company set the stage 10 years ago when it gave all of its mainframes, starting with zSeries S/390, the ability to run Linux. While mainframes had been virtualizing since the introduction of the VM operating system 30 years earlier, once IBM added Linux, you could run virtual x86 servers on a mainframe.

Over the past several years, some organizations have done just that, consolidating and virtualizing x86 servers using Linux on the mainframe. Once you start doing that, you have the basis for a private cloud.

"You have this incredibly scalable server that's very strong in transaction management," says Judith Hurwitz, president and CEO of Hurwitz & Associates, an IT consultancy in Needham, Mass. "Here's this platform that has scalability and partitioning built in at its core."

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