CHAPTER 19

Performance Issues and Design Trade-Offs

In this chapter, we will examine certain aspects of disk drive performance in more detail. Some of the topics covered earlier are revisited here again, with the purpose of discussing some of their performance issues and analyzing their related design trade-offs. Chapter 16, Section 16.4, “Disk Performance Overview” has some introductory discussion of disk performance. This is a good time to review that section before continuing with this chapter.

19.1 Anatomy of an I/O

The one underlying thing that determines both response time and throughput of a disk drive is the I/O completion time [Schwaderer & Wilson, 1996, Ng 1998, Ruemmler & Wilkes 1994]. The time required by a disk drive to execute ...

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