A survey on SLA-based brokering for inter-cloud computing

Service Level Agreement (SLA), a contract between IT service provider and customer, clearly defines hardware and software parameters to ensure Quality of Service (QoS). Cloud Service Brokering (CSB) provides either API or User Interface (UI) between service subscriber and service provider which enable interoperability between several separate clouds to improve service intermediation, aggregation and arbitrage. Today, SLA-based brokering technology is emerging and has been used to ensure QoS for Inter-Cloud environment. In this paper, we surveyed and evaluated some of the latest SLA-based service brokering projects. Additionally, we discussed a high level architectural view of cloud service broker derived from these projects.