Today's computing world and application market is dominated by cloud technology. Cloud computing provides a powerful computing paradigm and deliver services over the network and has emerged as a new enterprise model. With Cloud computing, the service providers can provide on-demand services to users as needed. In cloud systems, enormous resources are involved and computations are done at a very vast scale which enables users to access huge amount of resources on demand. But there is uncertainty of the demand of cloud resources by the end users as it can vary depending on the time. Also it becomes costly affair in maintaining sufficient resources to meet peak resource requirements all the time. This is where dynamic scalability or elasticity comes into picture. Elasticity of cloud is very necessary as it allows the servers to resize the virtual machine deployed in the system and thereby fulfilling the requirement of new resources. Elasticity can be considered as the next great achievement which is getting much focus. In this paper, an effort has been put to analyze the impact of elasticity on cloud systems and how it will benefit the Cloud implementers to improve the systems performance and reduce the operation cost.

Cloud computing Elasticity Performance cost optimization throughput