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Difficulty: EasyAWS Pricing Models

A retail company is setting up two workloads on Amazon EC2. The first workload is a steady-state inventory application that must run continuously 24/7 for a one-year period. The second workload is a series of data analysis batch jobs that are flexible, fault-tolerant, and can be interrupted. Which TWO Amazon EC2 pricing models will provide the most cost-effective solution for these workloads? (Select TWO).

  1. Reserved Instances for the steady-state inventory applicationAnswer
  2. Spot Instances for the flexible batch data analysis jobsAnswer
  3. C
    On-Demand Instances for the steady-state inventory application
  4. D
    Spot Instances for the steady-state inventory application
  5. E
    On-Demand Instances for the flexible batch data analysis jobs

Answer

Reserved Instances for the steady-state inventory application and Spot Instances for the flexible batch data analysis jobs
Reserved Instances are the most cost-effective option for steady-state workloads with a predictable one-year or three-year duration, offering significant discounts compared to On-Demand. Spot Instances provide the greatest cost savings (up to 90%) for flexible, fault-tolerant workloads like batch processing that can handle interruptions.

Step-by-Step Solution

1
Analyze the first workload requirement.
The inventory application runs continuously 24/7 for a defined duration of one year. This represents a predictable, steady-state workload.
Identifying workload predictability is the first step in matching it to the correct AWS pricing model.
2
Select the optimal pricing model for the first workload.
Reserved Instances are chosen because they offer discounts up to 72% in exchange for a committed term of one or three years, matching the one-year requirement.
Reserved Instances maximize cost savings for steady-state, predictable workloads over a long term.
3
Analyze the second workload requirement.
The batch data analysis jobs are flexible, fault-tolerant, and can be interrupted.
Determining fault tolerance helps identify whether interruptible capacity can be utilized.
4
Select the optimal pricing model for the second workload.
Spot Instances are selected because they utilize spare AWS capacity at up to a 90% discount and are ideal for workloads that can tolerate interruptions.
Spot Instances provide the highest cost savings for workloads with flexible start and end times that can handle interruptions.

Key Concept

Selecting the most cost-effective Amazon EC2 pricing model based on workload characteristics such as predictability, runtime continuity, and fault tolerance.
Estimated Time:1m 0s
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Topics

AWS Pricing Models

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