SAA-C03 · Question #615
A company's production environment consists of Amazon EC2 On-Demand Instances that run constantly between Monday and Saturday. The instances must run for only 12 hours on Sunday and cannot tolerate…
The correct answer is A. Purchase Scheduled Reserved Instances for the EC2 instances that run for only 12 hours on. To cost-optimize a production environment running EC2 On-Demand instances constantly Mon-Sat and for 12 hours on Sunday without interruption, Scheduled Reserved Instances should be purchased for the Sunday workload.
Question
A company's production environment consists of Amazon EC2 On-Demand Instances that run constantly between Monday and Saturday. The instances must run for only 12 hours on Sunday and cannot tolerate interruptions. The company wants to cost-optimize the production environment. Which solution will meet these requirements MOST cost-effectively?
Options
- APurchase Scheduled Reserved Instances for the EC2 instances that run for only 12 hours on
- BPurchase Convertible Reserved Instances for the EC2 instances that run for only 12 hours on
- CUse Spot Instances for the EC2 instances that run for only 12 hours on Sunday. Purchase
- DUse Spot Instances for the EC2 instances that run for only 12 hours on Sunday. Purchase
How the community answered
(69 responses)- A84% (58)
- B4% (3)
- C3% (2)
- D9% (6)
Why each option
To cost-optimize a production environment running EC2 On-Demand instances constantly Mon-Sat and for 12 hours on Sunday without interruption, Scheduled Reserved Instances should be purchased for the Sunday workload.
Scheduled Reserved Instances are specifically designed for workloads that require capacity reservations for fixed, recurring periods, making them ideal for the 12-hour, non-interruptible Sunday requirement at a discounted rate compared to On-Demand.
Convertible Reserved Instances are for continuous usage over a 1-year or 3-year term with flexibility in instance type, not for scheduled, intermittent workloads.
Spot Instances are interruptible and thus unsuitable for workloads that 'cannot tolerate interruptions,' directly violating the requirement for the Sunday usage.
Spot Instances are interruptible and therefore not appropriate for the non-interruptible Sunday workload; while Savings Plans provide discounts for consistent usage, they do not address the specific scheduled, non-interruptible requirement as effectively as Scheduled RIs.
Concept tested: EC2 purchasing options, Scheduled Reserved Instances for predictable intermittent workloads
Source: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-scheduled-instances.html
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