Data Placement Policy in Distributed VoD Systems
VoD系统中磁盘存放策略的研究

One of the significant tasks when designing a VoD(Video-on-Demand) system is to support as many simul-taneous streams as possible. Obviously, it is closely related to the storage subsystem. In this paper, we compare theperformance of the storage subsystems based on two different designs by simulation, one data placement policy is us-ing the technique of striping, and the other is simply placing a whole video only in one server. We find that, when da-ta is CBR (Constant-Bit-Rate) coded, the numbers of simultaneous streams respectively supported by the twoschemes are equal, but the latter can present better service.