A number of technology and workload trends motivate to consider the appropriate resource allocation mechanisms and policies for streaming media services in shared cluster environments. This paper present MediaGuard - a model-based infrastructure for building QoS-aware streaming media services - that can efficiently determine the fraction of server resources required to support a particular client request over its expected lifetime. The proposed solution is based on a unified cost function that uses a single value to reflect overall resource requirements such as the CPU, disk, memory, and bandwidth necessary to support a particular media stream based on its bit rate and whether it is likely to be served from memory or disk.
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