... put some nice image here ...
Your OLTP system generates 600,000 physical disk accesses per hour.
You have two physical disks on which to place the data files. The
fast one takes 5 msec to complete an IO operation, the slow one 15
msec. What fraction of the IO operations should go to the faster
disk in order to minimize the mean IO response time?
The answer to the puzzle.
Load Balancing Puzzle - last updated July 11, 1996