Essentials of Computer Organization and Architecture
5th Edition
ISBN: 9781284123036
Author: Linda Null
Publisher: Jones & Bartlett Learning
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Chapter 11, Problem 18RETC
Explanation of Solution
LOOK and SCAN:
SSTF or Shortest Seek Time First is an
Using the Shortest Seek Time First (SSTF) algorithm the disk arm will access the data from that track which is nearest to its current position and move away gradually.
One of the risk with Shortest Seek Time First (SSTF) algorithm is that certain requests would keep getting relegated to the backof the queue because certain requests are serviced first. With more and more requests arriving, the probability that such a request will ever be serviced is very minimal and this phenomenon is known as “Starvation” and hence this algorithm is not the optimal one.
In order to solve this problem there are two better algorithm elevator algorithm or SCAN and LOOK algorithm...
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Chapter 11 Solutions
Essentials of Computer Organization and Architecture
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