Implementing SLA Constraints in Multi-Cloud Environments

The Cloud is today one of the most popular technologies in the field of Information Technology. When dealing with constraints related to a too low number of resources that are offered by a single Cloud service provider the implementation of a Multi-Cloud Federation intervenes. In the case of a Multi-Cloud Federation, Cloud service customers might interact with other Cloud service providers that offer the required number of resources. Other possibility is when the Cloud service provider (CSP) rents resources from other Cloud service providers. There also might be a composition of the two strategies. When dealing with Multi-Cloud Federation in the case of Cloud service providers it is critical to not violate the Service Level Agreement (SLA) contract that is in place between the Cloud service provider that uses various Cloud Service Infrastructures and the Cloud service customers (CSCs). In this article are discussed those SLA parameters and the security and trust ideas behind the Multi-Cloud Federation. We also make an analysis of the capacity variation of the Multi-Cloud Federation in different conditions.