MCS-284 Chapter 8 Homework (Fall 2000)

When turning in a homework problem, if it is one from the book, you should indicate the exercise number. This will be the reference number I use in reporting back your standing on the homework.
• Do exercise 8.17 on page 703. This refers back to the calculation on page 686, which has one little mystery in it. The last step in the calculation divides 64 KB by 22.8 ms and arrives at approximately 2.74 MB/sec. In order to make the arithmetic work here, you have to assume that KB is the 210 kind of K and MB is the 220 kind of M, rather than 103 and 106. For the size of the I/O transfers (64 KB) it is indeed reasonable that the K would be of the 210 kind. For the I/O rate (2.74 MB/sec), however, it would have been more traditional to use the 106 version of M, as our authors remark on page 642. In working your own version of this calculation on the homework, you may use either version of K and M, but be sure to explicitly state which. Also, remember that there are two issues that limit how many drives you put on a SCSI bus.

Instructor: Max Hailperin