What is the MOST cost-effective way to run this workload?

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In: SOA-C01
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An application running on Amazon EC2 allows users to launch batch jobs for data analysis.The jobs are run asynchronously, and the user is notified when they are complete.While multiple jobs can run concurrently, a user’s request need not be fulfilled for up to 24 hours.To run a job, the application launches an additional EC2 instance that performs all the analytics calculations.A job takes between 75 and 110 minutes to complete and cannot be interrupted.

What is the MOST cost-effective way to run this workload?

Run the application on On-Demand EC2 instances. Run the jobs on Spot Instances with a specified duration.

Run the application on Reserved Instance EC2 instances. Run the jobs on AWS Lambda.

Run the application on On-Demand EC2 instances. Run the jobs on On-Demand EC2 instances.

Run the application on Reserved Instance EC2 instances. Run the jobs on Spot Instances with a specified duration.

Explanations:

While Spot Instances can offer lower pricing, they are not ideal for jobs that cannot be interrupted. Spot Instances can be terminated with little notice, making them unsuitable for a job that takes 75 to 110 minutes and cannot be interrupted.

AWS Lambda is designed for short-duration tasks, with a maximum execution time of 15 minutes. Since the jobs take 75 to 110 minutes, Lambda is not suitable for this workload.

Running both the application and jobs on On-Demand EC2 instances is more expensive compared to other options. On-Demand instances incur higher costs, especially for long-running tasks.

Using Reserved Instances for the application provides cost savings for long-term usage. Running the jobs on Spot Instances with a specified duration offers cost savings while ensuring the job runs without interruptions as long as the duration is guaranteed. Spot Instances with a specified duration are a better option for non-interruptible tasks.

2026-04-04

2 Comments

  1. Austin
    Author

    I arrange that the answer is:
    Run the application on Reserved Instance EC2 instances. Run the jobs on Spot Instances with a specified duration.

  2. Michelle
    Author

    I arrange that the answer is:
    Run the application on Reserved Instance EC2 instances. Run the jobs on Spot Instances with a specified duration.

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