Input/output and files

Questions

1.A disk drive has 640 cylinders, numbered 0-639. The drive is currently serving the request at cylinder 68. The queue of pending requests in FIFO order is: 84, 153, 32, 128, 10, 133, 61, 69. Starting from the current head position, what is the total distance that the disk arms moves to satisfy all the pending requests for the following disk scheduling algorithms :

(i) FCFS (ii)C-SCAN (iii)SCAN (iv)SSTF 

2.Describe the 7 levels of RAID.   

3.A disk drive has 640 cylinders, numbered 0-639. The drive is currently serving the request at cylinder 200. The queue of pending requests in FIFO order is: 184, 232, 128, 25, 533, 161, 169. . Starting from the current head position, what is the total distance that the disk arms moves to satisfy all the pending requests for the following disk scheduling algorithms :

(i) FCFS (ii)C-SCAN (iii)SCAN (iv)SSTF     

4.What is RAID? Explain the advantage and disadvantage of RAID. Also explain 7 levels in brief.     

5.Why I/O buffering is necessary? State and explain different I/O buffering techniques.    

6.Define the following with respect to disk scheduling :

(i)Seek time (ii)Rotational delay (latency)(iii)Bandwidth.         

7.Discuss the evolution of the I/O function in detail.    

8. Describe I/O buffering in detail.    

9.Discuss types of files with suitable examples.

10.List and explain various access methods used by file system to retrieve information.

11.Explain disk free space management techniques.   

12.Explain with a neat diagram the windows 2000 file system.   

13.Describe any 4 types of file organization.    

14.Explain key features of windows file system.     

15.Describe methods of record blocking with the help of neat diagrams.   

16.Describe the following :

(i) File sharing (ii)Record blocking.   

17.Write a short note on secondary storage management.