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Migrating Applications to the Cloud: Rehost, Refactor, Revise, Rebuild, or Replace?
The CIO issues a simple directive: "Move some applications to the cloud." To do this, architects face bewildering choices. In this Decision Point, Principal Research Analyst Richard Watson steers architects to a choice from among five alternatives: Rehost on HIaaS, refactor using SIaaS and PaaS, revise for HIaaS or PaaS, rebuild on PaaS, or replace with SaaS. The decision must consider an organization's requirements, evaluation criteria, and architecture principles. However, no alternative offers a silver bullet: All alternatives require architects to understand application migration from multiple perspectives and criteria, such as IT staff skills, existing investments, and application architecture.