Which solution should be used to minimize costs?

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In: SAA-C02
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With: 2 Comments
A company is running an ecommerce application on Amazon EC2.The application consists of a stateless web tier that requires a minimum of 10 instances, and a peak of 250 instances to support the application’s usage.The application requires 50 instances 80% of the time.

Which solution should be used to minimize costs?

Purchase Reserved Instances to cover 250 instances.

Purchase Reserved Instances to cover 80 instances. Use Spot Instances to cover the remaining instances.

Purchase On-Demand Instances to cover 40 instances. Use Spot Instances to cover the remaining instances.

Purchase Reserved Instances to cover 50 instances. Use On-Demand and Spot Instances to cover the remaining instances.

Explanations:

Purchasing Reserved Instances for 250 instances would lead to significant overprovisioning, resulting in unnecessary costs.

Purchasing Reserved Instances for 80 instances and using Spot Instances for the remaining 170 may not cover peak load needs.

Purchasing On-Demand Instances for 40 and using Spot Instances for the remaining would leave a shortfall in capacity during peak times.

Purchasing Reserved Instances for 50 instances ensures the 80% usage is covered. Using On-Demand and Spot Instances for the rest optimizes cost for peak and fluctuating usage.

2026-04-07

2 Comments

  1. Emily
    Author

    I guess:
    Purchase Reserved Instances to cover 50 instances. Use On-Demand and Spot Instances to cover the remaining instances.

  2. Dennis
    Author

    I map out that the answer is:
    Purchase Reserved Instances to cover 50 instances. Use On-Demand and Spot Instances to cover the remaining instances.

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