In what circumstances might disk scheduling actually result in poorer performance than FCFS?

What will be an ideal response?


It is entirely possible that in some situations, requests to be serviced FCFS actually
come in the same order as a SCAN mechanism might service them. The point is simply that
there is overhead associated with each disk scheduling discipline, and scheduling is only
worthwhile only if the overhead is outweighed by the performance improvement.

Computer Science & Information Technology

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