Read all 'spi' posts in The Wisdom of Clouds
February 13, 2009 12:03 PM PST
For some time now, the "cloud-o-sphere" has generally agreed on a basic classification scheme for cloud computing, typically called the SPI model. SPI stands for "SaaS, PaaS and IaaS", or Software-as-a-Service, Platform-as-a-Service and Infrastructure-as-a-Service, respectively.
A few weeks ago, Randy Bias (the CTO of cloud vendor GoGrid) wrote a great post differentiating two classes of Infrastructure-as-a-Service offerings: infrastructure Web services versus cloud centers. I covered this differentiation earlier, but I've since come across another cloud model that leads me to believe there is a third category to consider.
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