在磁盘调度管理中，应先进行移臂调度，再进行旋转调度。假设磁盘移动臂位于21号柱面上，进程的请求序列如下表所示。如果采用最短移臂调度算法，那么系统的响应序列应为（ ）。
- A.②⑧③④⑤①⑦⑥⑨
- B.②③⑧④⑥⑨①⑤⑦
- C.①②③④⑤⑥⑦⑧⑨
- D.②⑧③⑤⑦①④⑥⑨
正确答案及解析
正确答案
解析
根据题干要求，先进行移臂调度，找到对应柱面。然后进行旋转调度，找到对应磁头和扇区。由表可知①⑤⑦在17柱面（21-17=4），②③⑧在23柱面（23-21=2），④⑥在32柱面（32-21=9）。因此按最短移臂算法，应该是23柱面→17柱面→32柱面→38柱面，只有D项满足。
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