The SCAN disk scheduling algorithm is also known as the:

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BlackTom AI · Accepted Answer

The question asks: The SCAN disk scheduling algorithm is also known as the:

Since the available answer choices are not provided in the options, we cannot enumerate each alternative and explain why they are right or wrong. However, we can address the key fact that is given in the provided answer: the SCAN algorithm is also known as the Elevator algorithm.

Understanding the concept: SCAN (or Elevator) moves the disk head in one direction, servicing all requests it encounters along the way, until it reaches the end of the disk. It then reverses direction and services requests on the return trip, continuing back and forth in a sweeping motion similar to an elevator picking up and dropping off passengers as it travels between floors. This behavior minimizes the overall seek time and reduces starvation by ensuring that requests are serviced in a predictable, monotonic sweep rather than jumping back and forth.

Why this name is appropriate: The analogy to an elevator comes from the way the head traverses the disk like an elevator car moving between floors, picking up requests as it passes and then moving to the end before coming back. The “elevator” metaphor captures the bidirectional, sweeping service pattern.

What would typically be in the other options (for context, even though they aren’t shown here): an option might contrast with SCAN by naming a strategy like FCFS (first-come, first-served), SSTF (shortest seek time first), C-SCAN (Circular SCAN), or LOOK/COOLLOOK variants, each with distinct movement rules. Knowing that SCAN is the same as Elevator helps distinguish it from these alternatives.

In summary, the statement that the SCAN disk scheduling algorithm is also known as the Elevator algorithm is correct because SCAN’s head movement resembles an elevator’s up-and-down traversal, sweeping through requests in one direction, then reversing, much like an elevator serving floors linearly.

The SCAN disk scheduling algorithm is also known as the:

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类似问题

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

Which disk scheduling algorithm is the simplest and processes requests in the order they arrive?

Consider a disk with tracks numbered 0 to 199. The current head position is 50 (Head Movement is Left). The request queue is: 98, 183, 37, 122, 14, 124, 65, 67. How Many Head movements are there in servicing requests using C-LOOK?Tip: Enter numerical data ONLY. E.g: "5" and NOT "5 Head Movements".

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

Which disk scheduling algorithm is the simplest and processes requests in the order they arrive?

Consider a disk with tracks numbered 0 to 199. The current head position is 50 (Head Movement is Right). The request queue is: 98, 183, 37, 122, 14, 124, 65, 67. How Many Head movements are there in servicing requests using SSTF?Tip: Enter numerical data ONLY. E.g: "5" and NOT "5 Head Movements".

In the context of disk scheduling, what is "starvation"?

Consider a disk with tracks numbered 0 to 199. The current head position is 50 (Head Movement is Right). The request queue is: 98, 183, 37, 122, 14, 124, 65, 67. How Many Head movements are there in servicing requests using SSTF?Tip: Enter numerical data ONLY. E.g: "5" and NOT "5 Head Movements".

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