| Summary: | 碩士 === 高雄工學院 === 電機與資訊工程研究所 === 85 === With recent advances in semiconductor technology and microprocessor design,
the performance of microprocessor improves rapidly at a rate of 40-60% per
year. In contrast ﹐ the performance of Input/Output(I/O) subsystem, such as
hard disk, improves only at a rate of 7-10% per year. This speed mismatch is
getting so severe that eventually I/O becomes the system performance
bottleneck. Disk arrays are thus introduced to alleviate this problem and
hopefully to remove the bottleneck.
This thesis first uses Generalized Stochastic Petri Nets (GSPN) to describe
actions taken place in a commercially available hard disk drive, and then
validates it by a calibrated disk simulation program. Next the approximate
model of a single disk drive is extended to describe two types of disk array:
(1) disk drives operating synchronously, and (2) disk drives operating
asynchronously. We evaluate these two types of disk array and compare their
performance improvement. Finally we extend asynchronous disk a rrays with two
I/O buses and report our findings.
(KEY WORDS： Disk Array； Redundant Array of Inexpensive Disks； Generalized
Stochastic Petri Net；Modeling and Simulation；Performance Evaluation)
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