5. Suppose that a disk drive has 40 cylinders, numbered 0 to 40. The drive is currently serving a request at cylinder 20 (the previous request served was at cylinder 19) when the last of these requests is made with none of these requests yet served. The queue of pending requests, in FIFO order, is 5, 25, 18, 3, 39, 8, and 35. A seek takes 5ms per cylinder movement. Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending request and also calculate the total seek time needed to serve these requests, for each of the following disk-scheduling algorithms? Explain with the help of a diagram in each case. [2X4] a. FCFS b. SSTF C. SCAN d. LOOK
5. Suppose that a disk drive has 40 cylinders, numbered 0 to 40. The drive is currently serving a request at cylinder 20 (the previous request served was at cylinder 19) when the last of these requests is made with none of these requests yet served. The queue of pending requests, in FIFO order, is 5, 25, 18, 3, 39, 8, and 35. A seek takes 5ms per cylinder movement. Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending request and also calculate the total seek time needed to serve these requests, for each of the following disk-scheduling algorithms? Explain with the help of a diagram in each case. [2X4] a. FCFS b. SSTF C. SCAN d. LOOK
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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