Give a statistical argument for why FCFS offers a small variance of response times.
What will be an ideal response?
The response time in FCFS is n multiplied by the average response time for the n ? 1
requests in front of the current request, plus the response time of the current request. FCFS
assumes that requests arrive at random and are evenly distributed over the cylinders, so
requests tend to take about the same amount of time with little variance.The nth request will
receive service after n ? 1 others have been serviced. Another key to keeping the variance
small is that arriving requests cannot get ahead of waiting requests in the request queue.
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