Suppose that a disk drive has 6,000 cylinders, numbered 0 to 5999. The drive is currently serving a request at cylinder 3797, and the previous request was at cylinder 1375. The queue of pending requests, in FIFO order, is: 1589, 5474, 2104, 1350, 4336, 3678, 1697, 1780, 3794, 3982, 2508 Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following disk-scheduling algorithms? Show the calculation result Show the sequence of the position of the head and calculation steps  1. SSTF 2. SCAN

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Suppose that a disk drive has 6,000 cylinders, numbered 0 to 5999. The drive is currently serving a request at cylinder 3797, and the previous request was at cylinder 1375. The queue of pending requests, in FIFO order, is:

1589, 5474, 2104, 1350, 4336, 3678, 1697, 1780, 3794, 3982, 2508

Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following disk-scheduling algorithms?

Show the calculation result

Show the sequence of the position of the head and calculation steps 

1. SSTF

2. SCAN

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