It really depends on your needs and those of your customers. Each of these cloud business models involves either a build, buy or partner decision, based on your requirements. All involve a certain degree of risk.
Some questions to consider are:
- Do you need to run your applications on a platform, or do you only need the applications in the cloud?
- Do you need infrastructure that supports multi-tenancy as well as different rules and policies for each department?
- Will your choice require a data center redesign to support cloud migration?
These questions will define the scope of your vendor requests for proposal (RFPs) and type of model you adopt. The objective is to start the process by examining your business requirements and then choosing the cloud delivery model that meets your demands -- not the other way around. Infrastructure as a Service (IaaS) is ideal for improving internal business models to be more virtual and cloud-ready. Time-to-market constraints may require you to go outside your own infrastructure and use another provider's Platform as a Service (PaaS) or Software as a Service (SaaS) to build the appropriate functionality in a shorter timeframe.
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This was first published in June 2012