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Exam AWS-SysOps topic 1 question 863 discussion

Exam question from Amazon's AWS-SysOps
Question #: 863
Topic #: 1
[All AWS-SysOps Questions]

A financial service company is running distributed computing software to manage a fleet of 20 servers for their calculations. There are 2 control nodes and 18 worker nodes to run the calculations. Worker nodes can be automatically started by the control nodes when required. Currently, all nodes are running on demand, and the worker nodes are used for approximately 4 hours each day.
Which combination of actions will be MOST cost-effective? (Choose two.)

  • A. Use Dedicated Hosts for the control nodes.
  • B. Use Reserved Instances for the control nodes.
  • C. Use Reserved Instances for the worker nodes.
  • D. Use Spot Instances for the control nodes and On-Demand Instances if there is no Spot availability.
  • E. Use Spot Instances for the worker nodes and On-Demand Instances if there is no Spot availability.
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Suggested Answer: CD 🗳️
by Newguru2020 at Nov. 1, 2020, 9:43 p.m.
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Newguru2020
Highly Voted 2 years, 7 months ago
Ans: B & E 2 Control Nodes need to run all the time - Reserved Instances is best 18 worker Nodes run 4 hrs a day - Spot instances/On-demand. Spot block would've been the best option.
upvoted 19 times
mrphuongbn
2 years, 7 months ago
Excellent explanation
upvoted 1 times
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albert_kuo
Most Recent 9 months, 1 week ago
Selected Answer: BE
B. Use Reserved Instances for the control nodes. Explanation: Using Reserved Instances for the control nodes could be a cost-effective option. Reserved Instances provide a significant discount compared to On-Demand Instances when you commit to a one- or three-year term. Since the control nodes are essential components that run continuously, using Reserved Instances for them can help save costs while ensuring stability. E. Use Spot Instances for the worker nodes and On-Demand Instances if there is no Spot availability. Explanation: This option suggests using Spot Instances for the worker nodes, which is a viable cost-effective approach. Spot Instances offer substantial cost savings but can be subject to interruptions if the Spot price exceeds your bid or if there is insufficient capacity. By having a fallback plan to use On-Demand Instances when Spot Instances are not available or too expensive, the company can maintain the necessary computing capacity while still benefiting from Spot pricing when it's available.
upvoted 1 times
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gulu73
1 year, 2 months ago
Selected Answer: BE
B and E answers
upvoted 1 times
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RicardoD
2 years, 6 months ago
B | E are the answers
upvoted 2 times
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abhishek_m_86
2 years, 6 months ago
B. Use Reserved Instances for the control nodes. E. Use Spot Instances for the worker nodes and On-Demand Instances if there is no Spot availability. Seem correct
upvoted 2 times
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AK1988
2 years, 6 months ago
can have scheduled reserved instances for worker nodes and spot or on demand for control as the actual work needs to done by worker nodes
upvoted 2 times
Cyril_the_Squirl
2 years, 5 months ago
AWS has terminated scheduled reserved instances. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-scheduled-instances.html
upvoted 1 times
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kiev
2 years, 6 months ago
I agree with all your answers but I was under the impression that with reserved instance, we need at least one year duration and nothing is said of the duration here and so we might just be assuming. Just a thought though.
upvoted 1 times
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jackdryan
2 years, 6 months ago
I'll go with B,E
upvoted 1 times
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HeliosABC
2 years, 7 months ago
Ans is B,E
upvoted 1 times
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ImranR
2 years, 7 months ago
B & E are correct
upvoted 1 times
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