双头镜像磁盘的调度算法与性能评价  

Disk Scheduling and Performance Evaluation in Two Head Mirrored Disk Systems

作　　者：秦啸[1] 韩宗芬[1] 庞丽萍 

机构地区：[1]华中理工大学计算机科学与技术学院

出　　处：《华中理工大学学报》1998年第4期12-14,30,共4页Journal of Huazhong University of Science and Technology

摘　　要：描述了两种先来先服务（ＦＣＦＳ）调度算法，一是串行定位的ＦＣＦＳ，另一个是并发定位的ＦＣＦＳ．提出了短寻道时间优先（ＳＳＴＦ）磁盘调度算法．在描述了模拟模型后，对以上三种调度算法进行了性能模拟及评价．从模拟结果中定量分析出并发定位调度算法的性能优于串行定位调度算法的性能，ＳＳＴＦ算法比ＦＣＦＳ算法的性能更优越．The formal model of the mirrored disk systems is described, and then two kinds of FCFS disk scheduling algorithms, in which one uses serial positioning and the other uses parallel positioning, are proposed. SSTF(short seek time first) algorithm for two head mirrored disk systems are also sketched in the paper. A simulation model and performance evaluations for these three algorithms are illustrated. Simulation results show that the parallel positioning gives performances far better than the serial positioning, and the performance of SSTF is better than that of FCFS.

关 键 词：双头镜像磁盘 磁盘调度算法 性能评价 

分 类 号：TP333.3[自动化与计算机技术—计算机系统结构]