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Recent advances in storage and communication technologies have spurred a strong interest in Video-on-Demand (VOD) services. Providing the customers of VOD servers with time of service guarantees offers two major ad- vantages. First, it makes VOD services more attractive by improving customer- perceived quality of service (QoS). Second, it improves throughput through the enhanced resource sharing attained by motivating the customers to wait. In this paper, we propose a new class of scheduling policies, called Next Schedule Time First (NSTF), which provides customers with schedule times and performs schedul- ing based on these schedule times. NSTF guarantees that customers will be ser- viced no later than scheduled and ensures that the schedule times are very accu- rate estimates of the actual times of service. We present alternative implem enta- tions of NSTF and show through simulation that NSTF works as expected and delivers outstanding performance benefits.

A New Class of Scheduling Policies for Providing Time of Service Guarantees in Video-on-Demand Servers