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Question 298 - SOA-C02 discussion

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A company is running distributed computing software to manage a fleet of 20 Amazon EC2 instances for calculations. The fleet includes 2 control nodes and 18 task nodes to run the calculations. Control nodes can automatically start the task nodes.

Currently, all the nodes run on demand. The control nodes must be available 24 hours a day, 7 days a week. The task nodes run for 4 hours each day. A SysOps administrator needs to optimize the cost of this solution.

Which combination of actions will meet these requirements? (Choose two.)

A.
Purchase EC2 Instance Savings Plans for the control nodes.
Answers
A.
Purchase EC2 Instance Savings Plans for the control nodes.
B.
Use Dedicated Hosts for the control nodes.
Answers
B.
Use Dedicated Hosts for the control nodes.
C.
Use Reserved Instances for the task nodes.
Answers
C.
Use Reserved Instances for the task nodes.
D.
Use Spot Instances for the control nodes. Use On-Demand Instances if there is no Spot availability.
Answers
D.
Use Spot Instances for the control nodes. Use On-Demand Instances if there is no Spot availability.
E.
Use Spot Instances for the task nodes. Use On-Demand Instances if there is no Spot availability.
Answers
E.
Use Spot Instances for the task nodes. Use On-Demand Instances if there is no Spot availability.
Suggested answer: A, E

Explanation:

To optimize the cost of a computing environment consisting of control nodes that are always on and task nodes that operate for a limited number of hours each day, consider the following strategies:

Purchase EC2 Instance Savings Plans for the Control Nodes: Since the control nodes are required to be operational 24/7, purchasing EC2 Instance Savings Plans is a cost-effective choice. These plans provide a lower price compared to on-demand instances, in exchange for a commitment to a consistent amount of usage (measured in $/hour) for a one or three-year period.

Use Spot Instances for the Task Nodes: Given that task nodes are used for a shorter duration (4 hours a day) and presumably can tolerate interruptions, using Spot Instances can significantly reduce costs. Spot Instances offer unused EC2 capacity at a fraction of the regular price, which can lead to substantial cost savings. Additionally, configure the system to fall back to On-Demand Instances during periods when Spot Instances are not available to ensure availability.

This combination leverages cost savings for continuous use and flexible, lower-cost options for intermittent use, optimizing overall operational costs efficiently.

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asked 16/09/2024
Kyaw Lin Thu
25 questions
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