
184 Chen Xu, Jizhe Xia, Qunying Huang, and Myra Bambacus
11.2.2.6 OS supports
EC2 supports both Windows and Linux operating systems running on
itsVMs.
11.2.2.7 Cost
EC2 has exible and multiple price models, which allow cloud consumers
to reduce costs based upon workloads. The costs are calculated based on
factors such as the tenant model, regions, and computing usage, instance
type and operating system of the instances. The tenant model includes
(1) On-Demand, (2) Reserved (Light, Medium, and Heavy for 1-Year,
3-Year), and (3) Spot.
• The On-Demand Instances model allows consumers to pay for
computing capacity by the hour without long-ter