MCS-284 Chapter 8 Homework (Fall 2001)
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