Three tier architecture: To select CSP through CloudServiceBroker in multicloud environment

Cloud computing is ruling the present IT Industry. The Cloud Service Requesters (CSR) are no longer interested to tie to a single Cloud Service Provider (CSP) because they are expecting the service at less cost, high performance, high availability and ease of use. This requirement motivates the Cloud Service Requesters to migrate from single to Multicloud Environment. Massive availability of different Cloud Service Providers in the market the CSRs are unable to choose a particular CSP. In this work, we introduced a Cloud Service Broker (CSB) in the Three Tier Architecture. This CSB acts as a mediator between the CSRs and CSPs. The CSB selects a CSP based on the Reputation Factor Value. This value is calculated by considering CSPs all previous transactions. This work is illustrated with a case study.