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Quality of Service (QoS) plays a critical role in the affective reservation of resources within service oriented distributed systems and has been widely investigated in the now well established paradigm of Grid Computing. The emergence of a new paradigm, Cloud Computing, continues the natural evolution of Distributed Systems to cater for changes in application domains and system requirements. Virtualisation of resources, a key technology underlying Cloud Computing, sets forth new challenges to be investigated within QoS and presents opportunities to apply the knowledge and lessons learnt from Grid Computing. QoS has been an issue in many of the Distributed Computing paradigms, such as Grid Computing and High Performance Computing.
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