Page 27 - CSAM2 - Successful Sales Engagement for Cloud Services

Supporting Student Notes:

• 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.”

• The alternative migration strategies Gartner suggests IT organizations consider are:

• Rehost, i.e. redeploy applications to a different hardware environment and change the application’s infrastructure
configuration. Rehosting an application without making changes to its architecture can provide a fast cloud migration
solution. However, the primary advantage of IaaS, that - teams can migrate systems quickly, without modifying their
architecture – can be its primary disadvantage as benefits from the cloud characteristics of the infrastructure, such as
scalability, will be missed.