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CLF-C02 Practice Question 61: Rightsizing Recommendations

AWS Certified Cloud Practitioner (CLF-C02) · Test 7 · question 1 of 10

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After a lift-and-shift migration, a company copied the sizes of its on-premises servers onto Amazon EC2. It now suspects that many instances are larger than they need to be. The company wants AWS to analyze how the instances are actually being used and recommend better-sized instance types. Which service should it use?

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Answer:

  • D. AWS Compute Optimizer

AWS Compute Optimizer analyzes the configuration and utilization metrics of resources and gives rightsizing recommendations. It reports whether each resource is optimal and flags idle resources, with the goal of lowering cost and improving performance. For EC2 instances it looks at the vCPUs, memory and other specifications, and at CloudWatch metrics such as CPU utilization and network and disk activity, by default over the last 14 days. It also shows projected utilization for each recommended instance type. Rightsizing like this is a key part of cloud economics: after a migration, you pay for what you provision, not what you use.

Option A, AWS Budgets, alerts you when actual or forecast spend crosses a threshold. It can tell the company it is overspending, but not which instances are oversized or what size they should be. Option B, AWS Pricing Calculator, estimates the cost of a configuration you enter yourself. It has no view of how the running instances are actually used. Option C, EC2 Auto Scaling, changes the *number* of instances in a group to match demand. It does not tell you that each instance is the wrong *size*.

Reference: What is AWS Compute Optimizer?

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