A SCSI disk model for multimedia storage systems

Modern magnetic disks support advanced features, such as read-ahead and cac hing, to optimize disk access performance. However, most of the proposed di sk models of multimedia storage systems in the literature are too simplifie d to consider the advanced features and result in inaccurate performance pr ediction. In this paper, we propose an accurate, detailed SCSI disk model c ustomized for multimedia storage systems, and the methodologies of extracti ng the parameters of the proposed model. Disk throughput is analyzed based on the model and verified by experiments under various contexts. The propos ed model and methodologies can benefit the multimedia storage system in man y ways, such as performance prediction, file layout design and disk I/O sch eduling policy.