Question: Question 4 [12 marks] A disk /O queue needs to be serviced by the operating system. Assume that the disk contains 200 tracks (ie. track

Question 4 [12 marks] A disk /O queue needs to be

Question 4 [12 marks] A disk /O queue needs to be serviced by the operating system. Assume that the disk contains 200 tracks (ie. track number 0 to 199) and that the track head is presently at track position 75The queue presently contains the following track requests: 90, 129, 130, 5, 131,20, 133, 136, 40, 45, 170, 10, 172,175, 189 The following questions are unrelated to one another. 5 marks] Assume that the above sequence is only a snap-shot in time but is representative of the distributive/localization nature of future I/O requests. Calculate the total track movements for the requests currently in the queue using FCFS, SSTF, SCAN and C-LOOK. Which method is best suited to manage the current and future disk L/O queues. a) 12 marks] What is the one main significant disadvantage of using contiguous allocation as a method for storage of information on a magnetic hard disk. b) 15 marks] If the Index-Node method is implemented, list three steps that are needed to delete a file and explain why Journaling is necessary. c) Question 4 [12 marks] A disk /O queue needs to be serviced by the operating system. Assume that the disk contains 200 tracks (ie. track number 0 to 199) and that the track head is presently at track position 75The queue presently contains the following track requests: 90, 129, 130, 5, 131,20, 133, 136, 40, 45, 170, 10, 172,175, 189 The following questions are unrelated to one another. 5 marks] Assume that the above sequence is only a snap-shot in time but is representative of the distributive/localization nature of future I/O requests. Calculate the total track movements for the requests currently in the queue using FCFS, SSTF, SCAN and C-LOOK. Which method is best suited to manage the current and future disk L/O queues. a) 12 marks] What is the one main significant disadvantage of using contiguous allocation as a method for storage of information on a magnetic hard disk. b) 15 marks] If the Index-Node method is implemented, list three steps that are needed to delete a file and explain why Journaling is necessary. c)

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