I am having hard time understanding the working of SCAN and CSCAN algorithm of disk scheduling.I understood FCFS,Closest Cylinder Next but heard that SCAN resembles elevator mechanism and got confused. My book says that for the incoming order :[10 22 20 2 40 6 38] (while the disk currently at 20) the SCAN moving at the start serves [(20) 20 22 38 40 10 6 2]; this requires moves of [0 2 16 2 30 4 4] cylinders, a total of 58 cylinders. How does the pattern [(20) 20 22 38 40 10 6 2] came?
SCAN and CSCAN algorithm
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Let's know what the SCAN(Elevator) disk-scheduling algorithm says:-
So, in your case, the current position of disk is at 20. So, as per the SCAN algorithm, it'll scan towards the nearest end, and just after hitting bottom, it scans up servicing the requests back up.
The order is :-
____
So, as per the given data, the order will be
[(20) 20 22 38 40 10 6 2];
EDIT :-
The only difference between SCAN and CSCAN is that in CSCAN,
As per CSCAN,the direction of movement would be same uptil bottom and then it'll reverse the path.
So, as per the given data, the order will be
[(20) 20 22 38 40 2 6 10];
Notice the change in last three disk positions.I hope it is clear. Feel free to ask remaining doubts.