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Difficulty: EasyCost-Optimized Compute Selection and Purchasing Strategies

A company is planning to migrate a workload to AWS. The workload consists of two main components:
1. A front-end web application that must run continuously on Amazon EC2 instances to handle a predictable, steady baseline traffic 24/7.
2. A background analytics batch job that is highly fault-tolerant, can run at any time of the night, and can be safely interrupted without losing progress.

Which combination of Amazon EC2 purchasing options will provide the most cost-effective solution to meet these requirements? (Select TWO.)

  1. Purchase EC2 Instance Savings Plans to cover the baseline capacity of the web application EC2 instances.Answer
  2. Use Spot Instances to run the fault-tolerant background analytics batch jobs.Answer
  3. C
    Use AWS Lambda to host the continuous 24/7 web application tier to eliminate idle instance costs.
  4. D
    Purchase Compute Savings Plans to apply discounts to the Amazon RDS database instances used by the application.
  5. E
    Deploy a DynamoDB table with Provisioned Capacity Mode to handle the highly unpredictable, spiky data storage needs of the batch jobs.

Answer

Using EC2 Instance Savings Plans for the steady-state web application EC2 instances, and Spot Instances for the fault-tolerant background analytics batch jobs.
The correct answer combines EC2 Instance Savings Plans for the predictable, continuous 24/7 web tier workload and Spot Instances for the interruptible, fault-tolerant background batch jobs. This combination leverages the deep discounts of Savings Plans for baseline needs and Spot Instances for flexible, batch workloads to minimize overall compute costs.

Step-by-Step Solution

1
Analyze the web application requirement.
The web application runs continuously (24/7) with predictable, steady traffic, which requires a compute purchasing option that provides discounts for consistent usage.
Identify the steady-state compute requirement to apply the most cost-effective commitment-based purchasing strategy.
2
Analyze the background batch job requirement.
The batch job is fault-tolerant, runs nightly, and can tolerate interruptions, making it a perfect candidate for utilizing unused capacity at a deep discount.
Identify the flexibility and interruptibility of the workload to safely apply Spot Instance discounts.
3
Select the appropriate AWS purchasing options.
EC2 Instance Savings Plans cover the baseline EC2 instances, and Spot Instances cover the batch jobs.
Map the workload characteristics to EC2 Instance Savings Plans (for baseline) and Spot Instances (for interruptible batch jobs).

Key Concept

Selecting cost-optimized Amazon EC2 purchasing options based on workload patterns (steady-state vs. fault-tolerant/flexible).
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Cost-Optimized Compute Selection and Purchasing Strategies