Taxonomy of SLA violation minimization techniques in cloud computing

Cloud computing is increasing its service sector day by day. Cloud provides its services in three service models namely Infrastructure as a service (Iaas), Platform as a service (Paas) and Software as a service (Saas). All the services provided by cloud are subscription based i.e. you have to pay only for the features you are going to use. The clients who use the cloud services expect the required services to be delivered on time. An agreement specifying the services required is called service level agreement (SLA). SLA provides the specifications i.e. time deadline to be delivered by the cloud providers & downtime with MTTR (mean time to resolve). SLA is a legal document and is required to be managed against data leakage, resource allocation miss management, multi-tenancy issues and data sharing. It provides quality of service (QoS) to the customer. When a cloud provider fails to provide the agreed services, the SLA is considered to be violated. SLA violations should be minimized in order to maintain QoS to the customers. This paper presents a study on taxonomy of cloud SLA. It includes components and SLA lifecycle, and different services of clouds. Review techniques to minimize SLA violations are also reported here in the study.