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Large-scale, value-added Internet services composed of independent cooperating or competing services will soon become common place. Several groups have addressed the performance, communication, discovery, and description aspects of these services. However, little work has been done on effectively composing paid services and the Quality-of-Service (QoS) guarantees that they provide. Authors address these issues in the context of distributed file storage in this paper. In particular, they propose, implement, and evaluate a cost-effective, QoSaware distributed file service comprising a front-end file service and back-end (third-party) storage services. The front-end service uses mathematical modeling and optimization to provide performance and availability guarantees at low cost by carefully orchestrating the accesses to the back-end services.
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