Design Issues and Performance Evaluation of Disk-array-Based Video Servers

• Main Authors: Chen, Chun-an, 陳順安
• Other Authors: Huang Yueh-Min
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/06507691451065839931

碩士 === 國立成功大學 === 工程科學系 === 84 === Advances in technology of hard disk have much improvement in storage capacity, seek time, and disk transfer rate. In recent years, hard disksare designed with disk zoning technique which partitions a hard disk toseveral zones. Under the technique, every track in the same zone has the samenumber of sectors. The technique not only promote the storage capacity, butalso makes different zones have different disk transfer rate - outer zoneshave higher disk transfer rate. However most studies of video servers did not take the advantages of diskzoning to design the video server. To quarantee video data retrieval, those studies use the disk transfer rate of inmost zone of disk to schedule thevideo server. These schemes waste the disk transfer rate of outer zones. In this thesis, a new video data placement scheme( we called Cluster-PairingData Placement Scheme) is proposed and a new disk scheduling scheme toefficiently utilize the disk transfer ratesof zones in disks and reduce theseek time by bounded the seek distance in a specific range on given time areinvestigated. The method can improve the number of users that video server can support. In the thesis, we proposed an algorithm todecide the size of clusters thenintroduce the cluster-pairing data placement scheme. We also discuss the designissues of our method. finally, we prove our system by simulation.