Homework SourseThe disk head is currently at track 53 and there are 200 tra
The disk head is currently at track 53 and there are 200 tracks on the disk platter (ranging from track 0 to track 199). For each of the following disk scheduling policies, determine the order in which the requests will be serviced and the number of tracks traversed to service each request.
SCAN/elevator 98,183, 37,122,14, 124,65,67 Next track Tracks traversed 53 Total Solution
SCAN/Elevator Next Track Tracks traversed 53 0 37 16 Going down like an elevator 14 23 0 14 Goes all the way down 65 65 Going up 67 2 98 31 122 24 124 2 183 59 Total tracks traversed 236 CSCAN (Circular SCAN) Next Track Tracks traversed 53 0 65 12 67 2 98 31 122 24 124 2 183 59 199 16 0 Return to the beginning 14 14 37 23 Total tracks traversed 183 Time to return to beginning is shorter than traversing 200 tracks If it is same, 183+200 = 383 tracks are traversed. LOOK Next Track Tracks traversed 53 0 37 16 14 23 Going down only as far as the last request 65 51 67 2 98 31 122 24 124 2 183 59 Total tracks traversed 208
