摘要
为了提高磁带设备的在线存储效率,提出了一种磁带库缓冲调度算法.该算法采用磁盘驱动器做缓存,将磁带库设备虚拟为逻辑块设备使用.同时,提出了主动写回以及读预取方法,将磁带库的随机读写操作顺序化,以改善系统随机读写性能.文中还对算法性能进行了详细分析,并利用仿真方法对算法进行了测试,结果证明系统集合I/O和单I/O响应时间能够得到明显改善.
In order to improve the on-line storage efficiency of magnetic tape, a buffer scheduling algorithm for tape library is put forward, in which the medium changer is virtualized as a logical block device and the disk drive is used as a buffer. An active write-back method and a data prefetching strategy are then presented to manage the random I/O process orderly and to improve the random I/O performance. Besides, the performance of the algorithm is analyzed in detail and a simulation is performed to test the algorithm. The results demonstrate that the proposed algorithm greatly deduces the aggregate and single I/O response time.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第5期75-80,共6页
Journal of South China University of Technology(Natural Science Edition)
关键词
磁带存储
虚拟存储
缓冲调度
主动写回
数据预取
magnetic tape storage
virtual storage
buffer scheduling
active write-back
data prefetching
