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Exam AWS-SysOps topic 1 question 29 discussion

Exam question from Amazon's AWS-SysOps
Question #: 29
Topic #: 1
[All AWS-SysOps Questions]

You run a web application where web servers on EC2 Instances are in an Auto Scaling group. Monitoring over the last 6 months shows that 6 web servers are necessary to handle the minimum load During the day up to 12 servers are needed five to six days per year, the number of web servers required might go up to
15.
What would you recommend to minimize costs while being able to provide hill availability?

  • A. 6 Reserved instances (heavy utilization). 6 Reserved instances {medium utilization), rest covered by On-Demand instances
  • B. 6 Reserved instances (heavy utilization). 6 On-Demand instances, rest covered by Spot Instances
  • C. 6 Reserved instances (heavy utilization) 6 Spot instances, rest covered by On-Demand instances
  • D. 6 Reserved instances (heavy utilization) 6 Reserved instances (medium utilization) rest covered by Spot instances
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Suggested Answer: B 🗳️
by FHU at May 17, 2021, 10:49 a.m.
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albert_kuo
1 year, 9 months ago
In this scenario, if maintaining high availability is the primary concern, it may be more advisable to rely on Reserved Instances and On-Demand instances rather than depending heavily on Spot Instances, which might have the risk of interruptions. Therefore, Option A (using Reserved Instances for both heavy and medium utilization) could be considered a safer approach to provide high availability while still minimizing costs. Ultimately, both Option A and Option B could be valid choices, and the decision depends on the specific requirements and risk tolerance of the web application's workload.
upvoted 1 times
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ablazleon
3 years, 1 month ago
Selected Answer: B
I don't agree with A, it will imply buying some instances for a year when they are only need for some specific period of time (https://aws.amazon.com/ec2/pricing/reserved-instances/)
upvoted 1 times
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ceeee
3 years, 6 months ago
Correct answer is B acually. Going with A means u are reserving 6 instances for 6 days throughout the entire year ? and for what lol. it's very expensive to do so
upvoted 1 times
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xxxdolorxxx
3 years, 6 months ago
My vote goes to A.
upvoted 1 times
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TroyMcLure
3 years, 6 months ago
Correct Answer: A Spot Instances shouldn't be used with this purpose because availability is not guaranteed.
upvoted 1 times
Sekir
5 months, 4 weeks ago
Incorrect, Answer is B. Sure, spot instances availability is not guaranteed, but so is the server traffic of 15 instances. Since your objective is to minimize costs, you will assure the 12 and provide somewhat reliable for 15. 3 on-demand strikes out the “minimize costs” objective.
upvoted 1 times
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Kognitiv
3 years, 6 months ago
I agree, however another major factor was cost and spot instances are more flexible in cost.
upvoted 1 times
Kognitiv
3 years, 6 months ago
You have 6 dedicated reserved instances for heavy utilization, 6 on demand instances for those 5/6 days out of the year. Then leave the rest up to spot instances, since it is trying to have the best of both worlds w/ Cost & HA...
upvoted 2 times
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FHU
3 years, 7 months ago
Letter A.
upvoted 1 times
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