As a concept, Cloud computing is a pointer to the future, but there is much hype around the present. As James Maguire of Datamation put it recently: "As Cloud computing has emerged as a red hot trend, tech vendors of every stripe have painted the term Cloud on their products, much like food brands all tout that theyre low fat'."
Quite simply the idea is impractical for legacy enterprise applications. It is yet another technical solution to a business problem. Such technical solutions to non-technical problems usually don't solve the original problem. They tend to introduce more problems of their own, and almost invariably introduce greater complexity to be managed, but IT loves them. They offer a silver bullet, out-of-the-box fix to take the pain away, which is hard to resist. So it is with "The Cloud".
Cloud computing is one of those hype terms that gets applied to everything, so, to be clear, we are also not referring to internal grids or hosted computing or the myriad other things that seem to get lumped into The Cloud".
What we are talking about is infrastructure than moves around the network, including outside the bounds of the organisation to providers of resources on-demand. Using one proposed ontology: platform, processing, data and communications as a service or, for the acronym lovers out there, PPDCaaS.
Bernard Golden, one of the leading thinkers on open source, has some interesting things to say about obstacles to adoption of the Cloud in his article The Case Against Cloud Computing. He identifies five obstacles and in Part I he looks at the first: migration. He is open-eyed but upbeat about addressing the problem of legacy migration, and believes it can be overcome. I, on the other hand, am a little more sceptical.
For the Birds
"According to one person I spoke with," writes Golden, "migrating applications out of internal data centers and into the Cloud is the key interest driver for Clouds among enterprises. But, once they find out how difficult it is to move an application to an external Cloud, their enthusiasm dwindles. It seems well within technical capability for someone to develop a P2C (physical to Cloud) migration tool that could all or much of the technical effort necessary for migration. Of course, this tool would need to be able to translate to several different Cloud architectures.