Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4,999.  The drive is currently serving a request at cylinder 2,150, and the previous request was at cylinder 1,805. The queue of pending requests, in FIFO order, is: 2,069 1,212 2,296 2,800 544 1,618 356 1,523 4,956 3,681 Calculate the total seek time for each of the schedules      TOTAL DISTANCE TOTAL SEEK TIME FCFS 13011   SSTF 7586   SCAN 7492   LOOK 7424   C-SCAN 9917   C-LOOK 9137

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
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  1. Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4,999.  The drive is currently serving a request at cylinder 2,150, and the previous request was at cylinder 1,805. The queue of pending requests, in FIFO order, is:

2,069 1,212 2,296 2,800 544 1,618 356 1,523 4,956 3,681

Calculate the total seek time for each of the schedules 

 

  TOTAL DISTANCE TOTAL SEEK TIME
FCFS 13011  
SSTF 7586  
SCAN 7492  
LOOK 7424  
C-SCAN 9917  
C-LOOK 9137  
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