Que : 1 . The performance of a file system depends upon the cache hit rate.
If it takes 1 msec to satisfy a request from the cache but 10 msec to satisfy a request if a disk read is needed, then the mean time (ms) required for a hit rate ?h? is given by: (D-2007)
Option 2 is Correct Answer.
The mean time required to satisfy a request is
h * 1 + (1 - h) * 40
= h + 40 - 40h
= 40 - 39h