  In the cloud environment, data centers are efficiently manipulated by cloud
service providers (CSPs) in terms of energy consumption. Consequently,
migrating workloads to clouds can result in lower energy consumption. This
paper demonstrates that the Lift-and-Shift migration with optimal selections of
cloud instances can provide significant energy savings, and explains how much
and where the energy savings are obtained from. Additionally, the analysis on
the variation of energy consumption is given when Auto-Scaling is deployed
showing that further energy savings are expected even without refactoring
applications. All the conclusions and analyses are based on the real data
collected by Cloudamize Inc. from May 2016 to August 2016 over 40,000 machines
across approximately 300 data centers.
