An adaptive Qos-aware cloud

As an emerging technique, cloud computing has been suffering challenges from its quality of service (QoS) guarantee. Any violation of SLA would lead to a loss for both cloud providers and customers. To solve this problem, dynamical management of resources to ensure the QoS has been put forward as a demanding work in the cloud. In this paper, we present an adaptive QoS-aware cloud based on the Eucalyptus, which can dynamically scale up and down to guarantee QoS negotiated via SLA. Our adaptive QoS-aware cloud employs two load balancing policies and monitors the application-level QoS to scale adaptively. We conduct the evaluation in open source Eucalyptus based on XEN virtual machine monitor (VMM). As demonstrated in our experiment, our solution presents an adaptive scalability while maintaining the QoS.