Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 505 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C03

Question #: 505
Topic #: 1

[All AWS Certified Solutions Architect - Associate SAA-C03 Questions]

A company has Amazon EC2 instances that run nightly batch jobs to process data. The EC2 instances run in an Auto Scaling group that uses On-Demand billing. If a job fails on one instance, another instance will reprocess the job. The batch jobs run between 12:00 AM and 06:00 AM local time every day.

Which solution will provide EC2 instances to meet these requirements MOST cost-effectively?

A. Purchase a 1-year Savings Plan for Amazon EC2 that covers the instance family of the Auto Scaling group that the batch job uses.
B. Purchase a 1-year Reserved Instance for the specific instance type and operating system of the instances in the Auto Scaling group that the batch job uses.
C. Create a new launch template for the Auto Scaling group. Set the instances to Spot Instances. Set a policy to scale out based on CPU usage.
D. Create a new launch template for the Auto Scaling group. Increase the instance size. Set a policy to scale out based on CPU usage.

Show Suggested Answer

Suggested Answer: C 🗳️

by nosense at May 19, 2023, 10:43 a.m.

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Comments

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cloudenthusiast

Highly Voted 1 year, 7 months ago

Selected Answer: C

Purchasing a 1-year Savings Plan (option A) or a 1-year Reserved Instance (option B) may provide cost savings, but they are more suitable for long-running, steady-state workloads. Since your batch jobs run for a specific period each day, using Spot Instances with the ability to scale out based on CPU usage is a more cost-effective choice.

upvoted 14 times

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Guru4Cloud

Highly Voted 1 year, 4 months ago

Selected Answer: C

C is the most cost-effective solution in this scenario. Using Spot Instances allows EC2 capacity to be purchased at significant discounts compared to On-Demand prices. The auto scaling group can scale out to add Spot Instances when needed for the batch jobs. If Spot Instances become unavailable, regular On-Demand Instances will be launched instead to maintain capacity. The potential for interruptions is acceptable since failed jobs can be re-run.

upvoted 7 times

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sandordini

Most Recent 8 months, 1 week ago

Selected Answer: C

Stateless, most cost-effective >> Spot

upvoted 3 times

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awsgeek75

11 months, 3 weeks ago

Selected Answer: C

You don't need any scaling really as the job runs on another EC2 instance if it fails on first one. A. B. D are all more expensive than C due to spot instance being cheaper than reserved instances.

upvoted 3 times

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TariqKipkemei

1 year, 5 months ago

Selected Answer: C

Spot Instances to the rescue....whooosh

upvoted 2 times

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wRhlH

1 year, 6 months ago

" If a job fails on one instance, another instance will reprocess the job". This ensures Spot Instances are enough for this case

upvoted 4 times

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Abrar2022

1 year, 6 months ago

Selected Answer: C

Since your batch jobs run for a specific period each day, using Spot Instances with the ability to scale out based on CPU usage is a more cost-effective choice.

upvoted 2 times

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