Five Ways to Migrate Applications to the Cloud - Slide 5

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Rebuild: Rebuild the solution on PaaS, discard code for an existing application and re-architect the application.

Although rebuilding requires losing the familiarity of existing code and frameworks, the advantage of rebuilding an application is access to innovative features in the provider's platform. They improve developer productivity, such as tools that allow application templates and data models to be customized, metadata-driven engines, and communities that supply pre-built components. However, lock-in is the primary disadvantage so if the provider makes a pricing or technical change that the consumer cannot accept, breaches service level agreements (SLAs), or fails, the consumer is forced to switch, potentially abandoning some or all of its application assets.

Organizations seeking to move applications into the cloud have five options: rehost on infrastructure-as-a-service (IaaS), refactor for platform-as-a-service (PaaS), revise for IaaS or PaaS, rebuild on PaaS, or replace with software-as-a-service (SaaS), according to Gartner, Inc.

“When the CIO issues the simple directive ‘Move some applications to the cloud,’ architects face bewildering choices about how to do this, and their decision must consider an organization’s requirements, evaluation criteria, and architecture principles,” said Richard Watson, research director at Gartner. “However, no alternative offers a silver bullet: All require architects to understand application migration from multiple perspectives and criteria, such as IT staff skills, the value of existing investments, and application architecture.”

This slideshow highlights the alternative migration strategies Gartner suggests IT organizations consider.

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