Elasticity Management in Private and Hybrid Clouds

Cloud computing requires elasticity management for dynamically allocating and releasing resources. Even though the adoption of cloud services has been growing, there is little knowledge available for guiding users when they need to manage elasticity. This paper analyzes elasticity in private and hybrid clouds, using a university lab, PlanetLab and Amazon EC2. Results show that the choice of metrics and thresholds plays a key role in meeting performance levels and controlling costs and that cloudburst can be effectively used for a hybrid cloud but the choice of the type of virtual machine in the provider has a significant impact.