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Consider the following five disk access requests of the form (request-id, cylinder number) that are present in the disk scheduler queue at a given time.
(P, 155), (Q, 85), (R, 110), (S, 30), (T, 115)
Assume the head is positioned at cylinder 100. The scheduler follows Shortest Seek Time First scheduling to service the requests.
Which one of the following statements is/are true?
  • a)
    R is serviced before Q.
  • b)
    Q is serviced after R, but before S.
  • c)
    The direction of the head reverses after S is serviced.
  • d)
    None of these
Correct answer is option 'A,B,C'. Can you explain this answer?
Most Upvoted Answer
Consider the following five disk access requests of the form (request-...
In the Shortest Seek Time First (SSTF) disk scheduling algorithm, the I/O request which requires the least disk arm movement, irrespective of the direction, from the current position is selected.
Now,
Given the disk, the head is currently at cylinder number 100.
Using SSTF it would next serve the request-id R with cylinder number 110 because it requires the least amount of arm movement. After R being served, T would be served and so on, as shown below:
Hence, the correct options are (A), (B) and (C).
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Consider the following five disk access requests of the form (request-id, cylinder number) that are present in the disk scheduler queue at a given time.(P, 155), (Q, 85), (R, 110), (S, 30), (T, 115)Assume the head is positioned at cylinder 100. The scheduler follows Shortest Seek Time First scheduling to service the requests.Which one of the following statements is/are true?a)R is serviced before Q.b)Q is serviced after R, but before S.c)The direction of the head reverses after S is serviced.d)None of theseCorrect answer is option 'A,B,C'. Can you explain this answer?
Question Description
Consider the following five disk access requests of the form (request-id, cylinder number) that are present in the disk scheduler queue at a given time.(P, 155), (Q, 85), (R, 110), (S, 30), (T, 115)Assume the head is positioned at cylinder 100. The scheduler follows Shortest Seek Time First scheduling to service the requests.Which one of the following statements is/are true?a)R is serviced before Q.b)Q is serviced after R, but before S.c)The direction of the head reverses after S is serviced.d)None of theseCorrect answer is option 'A,B,C'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider the following five disk access requests of the form (request-id, cylinder number) that are present in the disk scheduler queue at a given time.(P, 155), (Q, 85), (R, 110), (S, 30), (T, 115)Assume the head is positioned at cylinder 100. The scheduler follows Shortest Seek Time First scheduling to service the requests.Which one of the following statements is/are true?a)R is serviced before Q.b)Q is serviced after R, but before S.c)The direction of the head reverses after S is serviced.d)None of theseCorrect answer is option 'A,B,C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following five disk access requests of the form (request-id, cylinder number) that are present in the disk scheduler queue at a given time.(P, 155), (Q, 85), (R, 110), (S, 30), (T, 115)Assume the head is positioned at cylinder 100. The scheduler follows Shortest Seek Time First scheduling to service the requests.Which one of the following statements is/are true?a)R is serviced before Q.b)Q is serviced after R, but before S.c)The direction of the head reverses after S is serviced.d)None of theseCorrect answer is option 'A,B,C'. Can you explain this answer?.
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