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Question

Difficulty: EasyAWS Pricing Models

A business is deploying a legacy database server that must run continuously 24/7 for a predictable duration of one year. Which Amazon EC2 pricing model should the business select to achieve the highest cost savings for this workload?

  1. A
    On-Demand Instances
  2. B
    Spot Instances
  3. Reserved InstancesAnswer
  4. D
    Dedicated Hosts

Answer

Reserved Instances
The correct answer is Reserved Instances because they are designed specifically for workloads with predictable, steady-state usage. Committing to a one-year or three-year term allows the business to secure a substantial discount compared to On-Demand pricing, which fits the database server's continuous running requirement perfectly.

Step-by-Step Solution

1
Analyze the workload characteristics
The database workload is steady-state, predictable, runs continuously 24/7, and has a defined duration of one year.
Identifying workload requirements is the first step in matching them to the correct pricing model.
2
Evaluate the AWS pricing options based on cost-efficiency and commitment
Reserved Instances match the one-year steady-state commitment requirement, offering the best cost savings compared to On-Demand, while avoiding the interruption risk of Spot Instances.
Selecting the option that minimizes cost while meeting the availability requirements ensures a reliable and optimized deployment.

Key Concept

AWS Pricing Models
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Topics

AWS Pricing Models

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