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

Question

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?

查看解析

登录即可查看完整答案

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 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"?

The SCAN disk scheduling algorithm is also known as the:

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".

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单