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Q2 (6 marks) We observe a closed system for 30 minutes, during which 1600 tasks are completed, from 12 terminals.
Q2 (6 marks) We observe a closed system for 30 minutes, during which 1600 tasks are completed, from 12 terminals. Each terminal (source oftasks) has a think time of 12s between receiving the response to one task,and submitting the next task. The system has a CPU and two disks, one isfast, the other is slow. The fast disk can deliver a block in 1/2 of the timethat the slow disk would take. During the observation period, 32000accesses occur at the fast disk, and 12000 accesses at the slow disk.During the observation period, the CPU is busy for 1080s, the fast disk isbusy for 400s, and the slow disk is busy for 600s.a) What is the response time for jobs in the observed system?b) As a function of N, the number of terminals, what are the high-loadbounds for throughput and response time?c) As a function of N, what are the low-load bounds for throughput andresponse time?d) How many terminals can we support, while keeping the response timebelow 3 s?e) Suppose we plan to replace the CPU with a CPU whose speed isdouble (thus the time to execute each job would decrease so it becomes1/2 of the current time). Estimate the number of terminals we cansupport, with response time below 3s.f) Propose a design that can support 45 terminals with response timebelow 3s.
