“look” is a variant of “SCAN” disk-arm scheduling algorithm. In this algorithm, if no more I/O requests are left in current direction, the disk head reverses its direction. The seek times in Shortest Seek First (SSF) and “look” disk-arm scheduling algorithms respectively are:
A. 144 and 123 milliseconds
B. 143 and 123 milliseconds
C. 149 and 124 milliseconds
D. 256 and 186 milliseconds
Answer:B
“look” is a variant of “SCAN” disk-arm scheduling algorithm. In this algorithm, if no more I/O requests are left in current direction, the disk head reverses its direction. The seek times in Shortest Seek First (SSF) and “look” disk-arm scheduling algorithms respectively are:
A. 144 and 123 milliseconds B. 143 and 123 milliseconds C. 149 and 124 milliseconds D. 256 and 186 milliseconds