5. Suppose that a disk drive has 40 cylinders, numbered 0 to 40. The drive is currently serving a request at cylinder 20 (the previous request served was at cylinder 19) when the last of these requests is made with none of these requests yet served. The queue of pending requests, in FIFO order, is 5, 25, 18, 3, 39, 8, and 35. A seek takes 5ms per cylinder movement. Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending request and also calculate the total seek time needed to serve these requests, for each of the following disk-scheduling algorithms? Explain with the help of a diagram in each case. [2X4] a. FCFS b. SSTF C. SCAN d. LOOK

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
icon
Related questions
Question
100%
5. Suppose that a disk drive has 40 cylinders, numbered 0 to 40. The drive is currently serving a request
at cylinder 20 (the previous request served was at cylinder 19) when the last of these requests is made
with none of these requests yet served. The queue of pending requests, in FIFO order, is 5, 25, 18, 3,
39, 8, and 35. A seek takes 5ms per cylinder movement. Starting from the current head position, what
is the total distance (in cylinders) that the disk arm moves to satisfy all the pending request and also
calculate the total seek time needed to
these requests, for each of the following disk-sc
ling
algorithms? Explain with the help of a diagram in each case. [2X4]
a. FCFS
b. SSTF
c. SCAN
d. LOOK
Transcribed Image Text:5. Suppose that a disk drive has 40 cylinders, numbered 0 to 40. The drive is currently serving a request at cylinder 20 (the previous request served was at cylinder 19) when the last of these requests is made with none of these requests yet served. The queue of pending requests, in FIFO order, is 5, 25, 18, 3, 39, 8, and 35. A seek takes 5ms per cylinder movement. Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending request and also calculate the total seek time needed to these requests, for each of the following disk-sc ling algorithms? Explain with the help of a diagram in each case. [2X4] a. FCFS b. SSTF c. SCAN d. LOOK
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 4 steps with 3 images

Blurred answer
Knowledge Booster
Hash Table
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Database System Concepts
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education