(a) Suppose a disk drive has 3,000 cylinders, numbered 0 to 2,999. The drive is currently serving a request at cylinder 500 and the previous request was at cylinder 600. You are required to construct a queue of random pending requests in FIFO order (of minimum 10 inputs). Starting from the current head position, what is the difference between the total distance (in cylinders) that the disk are moves to satisfy all the pending requests for FCFS and SSTF.

(a) Suppose a disk drive has 3,000 cylinders, numbered 0 to 2,999. The drive is currently serving a request at cylinder 500 and the previous request was at cylinder 600. You are required to construct a queue of random pending requests in FIFO order (of minimum 10 inputs). Starting from the current head position, what is the difference between the total distance (in cylinders) that the disk are moves to satisfy all the pending requests for FCFS and SSTF.

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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Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.

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(a) Suppose a disk drive has 3,000 cylinders, numbered 0 to 2,999. The
drive is currently serving a request at cylinder 500 and the previous
request was at cylinder 600. You are required to construct a queue of
random pending requests in FIFO order (of minimum 10 inputs).
Starting from the current head position, what is the difference between
the total distance (in cylinders) that the disk are moves to satisfy all the
pending requests for FCFS and SSTF.

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