A Detailed Simulation Model of the HP 97560 Disk Drive


David Kotz, Song Bac Toh, and Sriram Radhakrishnan. A Detailed Simulation Model of the HP 97560 Disk Drive. Technical Report number PCS-TR94-220, Dartmouth Computer Science, July 1994. ©Copyright the authors. Later revised as kotz:diskmodel-sw.


We implemented a detailed model of the HP 97560 disk drive, to replicate a model devised by Ruemmler and Wilkes (both of Hewlett-Packard, HP). Our model simulates one or more disk drives attached to one or more SCSI buses, using a small discrete-event simulation module included in our implementation. The design is broken into three components: a test driver, the disk model itself, and the discrete-event simulation support. Thus, the disk model can be easily extracted and used in other simulation environments. We validated our model using traces obtained from HP, using the same “demerit” measure as Ruemmler and Wilkes. We obtained a demerit figure of 3.9%, indicating that our model was extremely accurate. This paper describes our implementation, and is meant for those wishing to understand our model or to implement their own.

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