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Exam AWS-SysOps topic 1 question 561 discussion

Exam question from Amazon's AWS-SysOps
Question #: 561
Topic #: 1
[All AWS-SysOps Questions]

A company has an asynchronous nightly process that feeds the results to a data warehouse system for weekly and monthly reporting. The process is running on a fleet of Amazon EC2 instances. A SysOps Administrator has been asked to identify ways to reduce the cost of running this process.
What is the MOST cost-effective solution?

  • A. Use On-Demand EC2 instances in an Auto Scaling group
  • B. Use Spot Instances to bid for the EC2 instances
  • C. Use Reserved Instances to ensure the capacity
  • D. Put the EC2 instances in a placement group
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by saumenP at Oct. 29, 2019, 7:42 a.m.
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saumenP
Highly Voted 2 years, 7 months ago
B seems to be correct
upvoted 12 times
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albert_kuo
Most Recent 10 months, 1 week ago
Selected Answer: A
Using On-Demand EC2 instances (option A) can be costly since you would be paying the full On-Demand price, which is generally higher than Spot prices. Reserved Instances (option C) offer cost savings but require a commitment for a specific term, which might not be ideal for a nightly process that runs asynchronously. Putting the EC2 instances in a placement group (option D) doesn't directly reduce costs but can help improve network performance for tightly-coupled applications.
upvoted 1 times
albert_kuo
8 months, 3 weeks ago
change to B Using Spot Instances is the most cost-effective solution for reducing the cost of running the asynchronous nightly process. Spot Instances allow you to bid for spare Amazon EC2 capacity, which can result in significantly lower costs compared to On-Demand or Reserved Instances. While Spot Instances can be interrupted if the capacity is needed by On-Demand or Reserved Instances, for a nightly process that is not time-critical, the cost savings from using Spot Instances can outweigh the potential interruptions. You can use strategies like setting a bid price, leveraging Spot Fleets, or using a mix of Spot and On-Demand instances to ensure a balance between cost savings and availability.
upvoted 1 times
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fqnn
2 years, 6 months ago
I think answer is B Asynchonous nightly process implies that timing is irrelevant and not critical Running on a fleet of EC2 means that process doesn't need to run on a particular instance And finally they did specify that you have to pick the most cost effective solution, all checkboxes for spot instances are checked
upvoted 3 times
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NivNZ
2 years, 6 months ago
Asynchronous means that you can execute multiple things at a time and you don't have to finish executing the current thing in order to move on to next one. So the jobs does not have to run at a particular hour at night. So I think it's B for MOST cost-effective solution.
upvoted 2 times
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BKhan
2 years, 6 months ago
Ans is A: It is written in question "fleet of Amazon EC2 instances". Due to which we can choose Auto Scaling. This is only mentioned in A. Using Auto Scaling we can also reduce the cost.
upvoted 1 times
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ImranR
2 years, 6 months ago
asynchronous means time not determined...Jobs processing daily and nightly but time not fixed, so first preference should be on demand with Auto scaling but in this question performance is not an issue so scheduled reserved instance (for Night) with could be better option...
upvoted 1 times
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Chubb
2 years, 6 months ago
we know the timing, i will go with C, reserved instances.
upvoted 1 times
ImranR
2 years, 6 months ago
asynchronous means time not determined...It's daily and nightly process but not at fixed time...
upvoted 1 times
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JGD
2 years, 6 months ago
Answer: A, it is fixed to have weekly and monthly Reporting. How we can go with Spot instance, where we are not sure whether our bid will hit ? if someone put the higher bid against us, then that spot instance will be terminated.
upvoted 1 times
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kopper2019
2 years, 6 months ago
it's a daily process but says async process so spot instances
upvoted 1 times
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ezat
2 years, 6 months ago
they asked for most cost effective. they didn't say most efficient way. I'll choose B
upvoted 2 times
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sen12
2 years, 7 months ago
I differ. The jobs are nightly jobs for reporting purpose and how can we use the spot instances for these critical reporting jobs. I would rather go with On Demand Instance which will be my first preference or even reserved instance which as significant price deduction when going for long term contract. My answer will be A
upvoted 2 times
Golddust
2 years, 6 months ago
It's also weekly and Montly reporting. Not daily or hourly so spot instances should be ok and cost effective
upvoted 2 times
ImranR
2 years, 6 months ago
But asynchronous means not determined time...
upvoted 2 times
ANS0908431
2 years, 6 months ago
I agree with @ImranR. Option A is perfect for synchronous jobs but not for asynchronous ones because of the high price. B seems better.
upvoted 1 times
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ImranR
2 years, 6 months ago
It's nightly but daily process...
upvoted 1 times
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karmaah
2 years, 7 months ago
Most Cost effective. Ans B.
upvoted 3 times
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