A review on approaches in service level agreement in cloud computing environment

Cloud computing is recently has emerged as a pattern for hosting and service delivery on internet and has rapidly become a hot topic in academic and commercial environments and has attracted many people. Nowadays, we are encountering various cloud service providers. One of important aspects in cloud computing is service level agreement which is a contract involving service agreement between client and service computer. According to this contract, violation in commitments mentioned in agreement by service provider will be punished; therefore, service providers should have solutions to reduce these conflictions in service level and costs. Regarding importance of this topic, this article deals with approaches conducted in service level agreement and its comparison regarding improved parameters, simulation or implementation environment, workload and application.