ITPEC FE Morning April 2023 Question 57
As for activities in capacity management to estimate a service’s capacity, capability, and performance, which of the following is trend analysis?
Explanation
Tracking a resource's usage over time to forecast future usage — trend analysis extrapolates historical utilisation data.
Capacity management predicts capacity and performance with several techniques:
- •Trend analysis: plot the history of a resource's utilisation (CPU, disk, bandwidth) and project it forward
- •Analytical modelling: mathematical models such as queueing theory
- •Simulation modelling: generate artificial transactions and measure the response
- •Baseline model: an accurate model of current performance, the starting point for further modelling
Answer (c)
Why not others:
- •(a) — a model that accurately reflects current performance, built first, is the baseline model
- •(b) — generating simulated transactions to predict response time and throughput is simulation modelling
- •(d) — predicting response time and throughput with queueing theory is analytical modelling
Key rule: Trend analysis needs only historical data and assumes the past pattern continues; modelling is needed to predict the effect of changes the history has not seen.
Service Management · AI-written, may contain errors
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