Nick Carr's (read an interview with Carr here)The Big Switch suggests that every organisation concerned with computer storage will find that the everyday business market for storage will cease to exist. You who are reading this will no longer be involved with buying, operating, managing or servicing DAS, NAS, SAN, clustered file systems, tape backups or optical storage. I who am writing about it now won't be in the future. This medium itself will undergo substantial modification or die.

It's that stark. Carr's pitch is that businesses, and consumers, will increasingly switch over from present day DIY computing to utility-supplied computing, with information processing and storage functions carried out in 'the cloud.' Most of us are familiar with the concept. Google searches, Hotmail and are all cloud computing applications. Amazon's S3 and Google's office-like web-based functionality are too.

Sun has very recently decided to move away entirely from in-house datacentres to utility-supplied business computing functions and intends, simply, to have no business datacentres by 2015.
Carr's book is persuasive, well-researched, authoritative and convincing. He's reasonable in his conclusions and moderate in his extrapolations. This is an exceedingly good book.

The movement Carr describes is one where businesses and consumers increasingly make a decision based on where a computing application is carried out on the basis of cost, trust and convenience, and choose the web-supplied, grid-like, cloud computing alternative.

Consumers may do it more on convenience grounds than business, which will be more hard-nosed about costs, and both will be concerned about trust. That's trust in the network being there when we want it and trust in the remote supplier being reliable and safe. Familiarity will breed content.

If Carr is right - and he paints a very reliable picture - then we can make some assumptions.

First, every time a business decides to cease carrying out an application in its own (in-house or out-sourced) datacentre or on its staff's PCs, then that means a storage resource is not bought by that business.
Secondly, as these decisions mount up then the overall business storage market will increase at a slower rate and then turn down. The cloud computing storage market will grow very, very quickly indeed. The bigger cloud computing concerns, like Google, will roll their own storage and have a heavy JBOD orientation.
The utility computing suppliers will be able to offer services at a greater and greater discount to the cost of businesses having their own equivalent computing function because they will be able to buy kit more cheaply and run it at higher utilisation levels. This will increase the rate at which businesses switch over to utility computing.