10 marks 5 a in the context of disk scheduling

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(10 marks) 5. (a) In the context of disk scheduling, describe the FIFO Scheduling and SSTF Schedul- ing? (4 marks) (b) Suppose that a disk drive has 400 cylinders, numbered from Oto 399. The read/write head starts at track 100. The request queue, in order, contains requests for track 145, 158, 20, 90, 160, 138. Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending request for each of the following disk-scheduling algorithms? 1. FIFO ii. SSTF (6 marks) 6. (a) Compare RAID 0, RAID 1, and RAID 10 in terms of performance improvement, ability to withstand failure, and space overhead for the particular RAID level. (5 marks) (l>) As a data center architect, yo u are g iv en an arr ay of 10 disks of 100 GB ytes each. Organize th em into a RAID such th at it can hold 5 00 GByt es wo rth of data and withstand a failure of any single disk without inte rrupting data service. De fin e the notion of RAID. Name the RAID level you will have to use, explain how the data will be organized and why your set up can tolerate a disk failure. (5 marks) Page 7 of 8
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CSC 3401 Operating Systems Semester II 2015 - 2016 7. (a) What is the relationship between the minimum degree and the number of children in each internal node of a B-tree? (1 mark) (b) Consider the B-Tree below with a minimum degree = 2. Two insertions were made, key 15 followed by key 9. 1. Draw the B-Tree after 15 is inserted. 11. Draw the B-Tree after 9 is inserted. Page 8 of 8 26 (2 marks) (2 marks)
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