Consider a disk queue with request for input/output to block on cylinders 98, 183, 37, 122, 14, 124, 65, 67 in that order. Assume that disk head is initially positioned at cylinder 53 and moving towards cylinder number 0. The total number of head movements using Shortest Seek Time First (SSTF) and SCAN algorithms are respectively (A) 236 and 252 cylinders (B) 640 and 236 cylinders (C) 235 and 640 cylinders (D) 235 and 252 cylinders

Consider a disk queue with request for input/output to block on cylinders 

98, 183, 37, 122, 14, 124, 65, 67 

in that order. Assume that disk head is initially positioned at cylinder 53 and moving towards cylinder number 0. The total number of head movements using Shortest Seek Time First (SSTF) and SCAN algorithms are respectively (A) 236 and 252 cylinders (B) 640 and 236 cylinders (C) 235 and 640 cylinders (D) 235 and 252 cylinders
by

1 Answer

Answer :

Answer: 236 and 208 cylinders

Explanation:

SSTF

Initial head position =53

The closest queue to initial head position=65

head moves from 53 to 65=12

head moves from 65 to 67=2

head moves from 67 to 37=30

head moves from 37 to 14=23

head moves from 14 to 98=84

head moves from 98 to 122=24

head moves from 122 to 124=2

head moves from 124 to 183=59

Total head movement=236

SCAN

Initial head position=53 and moving towards 0

head moves from 53 to 37=16

head moves from 37 to 14=23

head moves from 14 to 65=51

head moves from 65 to 67=2

head moves from 67 to 98=31

head moves from 98 to 122=24

head moves from 122 to 124=2

head moves from 124 to 183=59

Total head movement=208 
by

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Consider the following statements for priority queue: S1: It is a data structure in which the intrinsic ordering of the elements does determine the result of its basic operations. S2: The elements of a priority queue may be complex structures that are ordered on one or several fields. Which of the following is correct? (A) Both S1 and S2 are incorrect. (B) S1 is correct and S2 is incorrect. (C) SI is incorrect and S2 is correct. (D) Both S1 and S2 are correct.

Description : Consider the following statements for priority queue: S1: It is a data structure in which the intrinsic ordering of the elements does determine the result of its basic operations. S2: The elements of a priority queue ... . (C) SI is incorrect and S2 is correct. (D) Both S1 and S2 are correct.

Last Answer : (D) Both S1 and S2 are correct.

A job has four pages A, B, C, D and the main memory has two page frames only. The job needs to process its pages in following order: ABACABDBACD Assuming that a page interrupt occurs when a new page is brought in the main memory, irrespective of whether the page is swapped out or not. The number of page interrupts in FIFO and LRU page replacement algorithms are (A) 9 and 7 (B) 7 and 6 (C) 9 and 8 (D) 8 and 6

Description : A job has four pages A, B, C, D and the main memory has two page frames only. The job needs to process its pages in following order: ABACABDBACD Assuming that a page interrupt occurs when a new page is brought in the main ... replacement algorithms are (A) 9 and 7 (B) 7 and 6 (C) 9 and 8 (D) 8 and 6

Last Answer : (C) 9 and 8