Design considerations to realize automated SLA negotiations in a multi-Cloud brokerage system

Cloud broker concept is considered as one of solutions for federating distributed multi-Cloud. In order to design and realize a Cloud brokerage system, we need to devise establishment and management of SLA (Service Level Agreement). Whereas a SLA negotiation in a Cloud is assumed to be a basic functionality to establish a SLA, there has been some lack of efforts to apply, configure, and design SLA negotiation mechanism for a Cloud broker, which arbitrates multiple Cloud providers. In this paper, therefore, we design a multi-Cloud broker and reveal design considerations to realize an automated SLA negotiation in a multi-Cloud broker. Briefly, the decision issues to realize a SLA negotiation are as follows: 1) Negotiation lifecycles according to types of Cloud broker, 2) negotiation protocol, 3) negotiable SLA issues, 4) multi-issue negotiation support, and 5) deployment position of negotiation agents.