Which disk scheduling algorithm might lead to a "sweeping" effect where requests are serviced in a patterned manner across the disk?

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BlackTom AI · Accepted Answer

To tackle the question, let's assess what a sweeping effect means in disk scheduling: a pattern where the disk head moves systematically across large portions of the disk, typically back and forth, creating a rising and falling access pattern.
Option a: FCFS (First-CCome-First-Served) processes requests strictly in arrival order without any deliberate head sweeping or structured traversal. This tends to be irregular and not characterized by a regular sweep across the disk, so it does not inherently produce a sweeping pattern.
Option b: SCAN uses an elevator-like approach where the disk head moves in one direction servicing requests as it encounters them, reaches an end, and then reverses direction to sweep back the other way. This creates a clear sweeping motion across large sections of the disk, which matches the described pattern.
Option c: SSTF (Shortest Seek Time First) always selects the nearest pending request, aiming to minimize seek time. This behavior results in a clustered, local optimization rather than a regular, sweeping traversal across the disk, so it does not produce the sweeping effect.
Option d: All of the above would imply that FCFS and SSTF also produce sweeping, which is not true for FCFS and SSTF as explained above. Therefore, this option is inaccurate.
Overall, the distinctive sweeping behavior aligns with the characteristics of the SCAN algorithm, while the other strategies do not inherently create such a sweeping pattern.

System Software and Computing Concepts (032025-ABB)

Which disk scheduling algorithm might lead to a "sweeping" effect where requests are serviced in a patterned manner across the disk?

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