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Analytical Study of Disk Performance for Continuous Media Streaming

Abstract The Study of disk performance is of prime importance as it helps in determining the number of streams that can be serviced by the system. There are two main parameters for disk performance - disk bandwidth and disk cache. Disk bandwidth refers to data transfer rate that is consumed in accessing data from disk. There are three different overheads that incur while accessing data from disk: seek time, rotational time, and transfer time. Because of large seek and rotational times, no data can be provided to users directly from disk on time. In that case, the data is first prefetched into disk cache from the disk that contributes only transfer time; no seek or rotational time. Disk cache is a very small area on disk and because of small size, its seek and rotational times are negligible. Thus the only overhead is transfer time. In this paper, we propose an analytical study to evaluate the performance of disk as regard to these parameters and show how both parameters can be utilized efficiently and effectively. This study is primarily useful in deciding the number of concurrent continuous media streams, especially video streams supported by a disk without hiccups and glitches.