1. Consider a demand-paging system with the following time-measured utilizations: CPU utilization 20% Paging disk 5% Other I/O devices 97% Indicate which will improve system utilization and explain your answer. a. Install a faster CPU .

b. Install a bigger paging disk.

c. Increase the degree of multiprogramming.

d. Decrease the degree of multiprogramming.

e. Install more main memory.

f. Install a faster hard disk or multiple controllers with multiple hard disks.

g. Add prepaging to the page-fetch algorithms.

h. Increase the page size.

2. How is X-RAID or Hybrid RAID different than regular RAID levels?

3. Using the program you just wrote, or by hand, calculate the total head movements for the following queues using FCFS (head starts at 53) 98, 183, 37, 122, 16, 128, 65, 67