Storage System for Supporting More Video Streams in Video Server
Multimedia Tools and Applications
Data Placement Scheme on Continuous Media Servers with ZBR Disks
ITCC '00 Proceedings of the The International Conference on Information Technology: Coding and Computing (ITCC'00)
Journal of Systems and Software
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Without proper care of the disk zoning issue, we may suffer a great loss in both storage and bandwidth utilization for supplying video streams. In this regard, we propose two schemes, free-p and fixed-p schemes, in a unified framework of rearranging the zone layout in a logical manner. The free-p scheme can optimally utilize resources, but needs a complicated timing control. Whereas, the fixed-p scheme can achieve a slightly lower utilization with a simpler timing control compared to the free-p scheme. The fixed-p scheme is further applied to a multiple-disk platform. The variable bit rates of individual disks may cause dramatic aggregated bit rate fluctuation, so we propose a novel data placement policy termed skewed zone-major round robin (SZRR) to ensure a stable disk-bus bandwidth utilization. A file system employing the proposed schemes has been implemented on a PC server equipped with five SCSI-II disk drives. We demonstrate that the system is able to support up to 70 1.5Mbps video streams simultaneously when a 20 second or so initial waiting time is allowed.