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Cloud computing has business executives salivating at the savings potential and demanding that their CTOs jump on the bandwagon and get to the cloud.
But, managers should make sure they understand the hidden cost involved, according to a study by the Information Systems Audit and Control Association (ISACA), called "Calculating Cloud ROI: From the Customer Perspective."
"Cloud computing makes it easy to offer the same self-service that people love when they turn on their lights or air-conditioning -- it’s on-demand and pay as you go. In reality, cloud computing is like every other innovation," says Marc Vael, CISA, CISM, CGEIT, CRISC, international vice president of ISACA. "Security, cost and complexity don’t disappear -- they just need to be managed and accounted for."
Thanks and Regards,
I would think you can at least get in the ball park with your head scratch method. Tom's had an ok piece on this a few months ago. It could give you some tips. http://www.tomsitpro.com/articles/cloud_migration.-iaas-public_cloud-pri...