06~Chapter 6

06~Chapter 6 - 6 Solutions Solution 6.1 6.1.1 a. Video Game...

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6 Solutions Solution 6.1 6.1.1 a. Video Game Controller—Input, Human Monitor—Output, Human CDROM—Storage, Machine b. Handheld GPS Keypad—Input, Human Display—Output, Human Satellite Interface—Input, Machine Computer Interface—I/O, Machine 6.1.2 a. Video Game Controller—0.0038 Mbit/sec Monitor—800–8000 Mbit/sec CDROM—88–220 Mbit/sec b. Handheld GPS Keypad—0.0001 Mbit/sec Display—800 Mbit/sec Satellite Interface—10 Mbit/sec Computer Interface—400–800 Mbit/sec 6.1.3 a. Video Game Controller—Operation Rate Monitor—Data Rate CDROM—Data Rate for most applications b. Handheld GPS Keypad—Operation Rate Display—Data Rate Satellite Interface—Data Rate Computer Interface—Data Rate Solution 6.2 6.2.1 a. 43848 b. 87480
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S202 Chapter 6 Solutions 6.2.2 a. 0.996168582375479 b. 0.998628257887517 6.2.3 Availability approaches 1.0. With the emergence of inexpensive drives, hav- ing a nearly 0 replacement time for hardware is quite feasible. However, replacing F le systems and other data can take signiF cant time. Although a drive manufac- turer will not include this time in their statistics, it is certainly a part of replacing a disk. 6.2.4 MTTR becomes the dominant factor in determining availability. However, availability would be quite high if MTT± also grew measurably. If MTT± is 1000 times MTTR, it the speciF c value of MTTR is not signiF cant. Solution 6.3 6.3.1 a. 15.196 ms b. 13.2 ms 6.3.2 a. 15.225 b. 13.233 6.3.3 The dominant factor for all disks seems to be the average seek time, although RPM would make a signiF cant contribution as well. Interestingly, by doubling the block size, the RW time changes very little. Thus, block size does not seem to be critical. Solution 6.4 6.4.1 a. Yes A satellite database will process infrequent requests for bulk information. Thus, increasing the sector size will allow more data per read request. b. No This depends substantially on which aspect of the video game is being discussed. However, response time is critical to gaming. Increasing sector size may reduce response time.
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Chapter 6 Solutions S203 6.4.2 a. Yes Increasing rotational speed will allow more data to be retrieved faster. For bulk data, this should improve performance. b. No Increasing rotational speed will allow improved performance when retrieving graphical elements from disk. 6.4.3 a. No A database system that is collecting data must have exceptionally high availability, or data loss is possible. b. Yes Increasing disk performance in a non-critical application such as this may have bene± ts. Solution 6.5 6.5.1 There is no penalty for either seek time or for the disk rotating into position to access memory. In effect, if data transfer time remains constant, performance should increase. What is interesting is that disk data transfer rates have always outpaced improvements with disk alternatives. Flash is the ± rst technology with potential to catch hard disk.
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This note was uploaded on 02/02/2011 for the course CS 2214 taught by Professor Hadimioglu during the Spring '10 term at NYU Poly.

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06~Chapter 6 - 6 Solutions Solution 6.1 6.1.1 a. Video Game...

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