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Designing a Video on Demand Server INTRODUCTION Video-on-demand VoD service will allow customers to request that certain movies or television shows be played on their television sets or computers immediately giving individuals direct access to the materials stored in a video server The goal of this project is to design a Video-on-Demand Server capable of performing to the following specifications Capacity - 25 feature-length movies Serve 4 different movies simultaneously No loss of videoaudio No stutter or skip 100 fault tolerance As previously discussed in the cost estimate the Video on Demand VoD Server will be based on a multi-processor x86 architecture The VoD server with all elements described in the cost estimate excluding RAID level 4 support will be implemented on the Windows NT operating system running on a 500MHz dual-processor Pentium III Xeon system with 512MB of memory The configuration will consist of two Ethernet interfaces connected to an Ethernet switch on a T3 backbone providing a peak network bandwidth of 30 Mbitssec Storage will consist of a set of four 18GB ULTRAWIDE SCSI-2 drives configured as a striped logical volume using standard Widows NT system tools To further increase transfer speed a 64MB hardware disk cache will also be used in the system Arrays of optical drives will also be employed as secondary storage The VoD Server will be linked to an array of Uninteruptable Power Supplies UPS capable of supplying 10 minutes of backup power Similar servers were tested in this configuration with multiple client access and was able to saturate the network with 150 clients playing MPEG1 and 2 streams The effective network usage was 25 Mbitssec However the network is saturated at this level due to the overhead associated with the TCP protocol I expect CPU utilization vs number of clients to be nearly linear as the number of clients increase In the following pages I will discuss the qualities of
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