Answer-Which I/O scheduling algorithm prevents starvation of requests?

Question

Accepted Answer

The SCAN scheduling algorithm, also called the Elevator Algorithm , prevents starvation by servicing requests in one direction until it reaches the end, then reversing direction. This ensures that every request, regardless of its position, gets serviced within a predictable timeframe.    How SCAN Works Requests are arranged based on their positions. The disk arm moves in a single direction, servicing requests, and reverses once it reaches the last request in that direction.   Prevents Starvation Since SCAN covers all requests in its path, even those far from the initial direction of the disk arm are eventually served.   Example    Requests 98, 183, 37, 122, 14, 124, 65, 67 Initial Head 53   SCAN Movement 53  37  14  Reverse  65  67  98  122  124  183  This ensures fairness in servicing requests.   Why Other Options Are Incorrect 1.    FCFS    While fair, FCFS can lead to high seek times due to requests being served in the order of arrival without considering their proximity.    2.    SSTF    SSTF selects the closest request but may cause starvation for distant requests.    3.    LOOK    LOOK is similar to SCAN but does not traverse to the end of the disk however, it also prevents starvation.    4.    CLOOK    CLOOK further optimizes LOOK but may still involve longer wait times for requests on the other side of the disk.

Which I/O scheduling algorithm prevents starvation of requests?

Detailed Solution

More Basics of Computers Questions

Hey! Ask a query

Please Register/Login