Exam AWS Certified SysOps Administrator - Associate topic 1 question 184 discussion

To ensure that Spot Instances launch on time and experience fewer interruptions, you should use the capacity-optimized allocation strategy. This strategy helps you get the most capacity for your specified Spot requirements and reduces the likelihood of interruptions. Additionally, adding more instance types to the Auto Scaling group enhances the chances of finding available Spot Instances at any given time. By diversifying the instance types, you increase the chances of securing Spot Instances with different pricing characteristics, which can contribute to a more stable and cost-effective configuration.

The correct answer is A. Specify the capacity-optimized allocation strategy for Spot Instances. Add more instance types to the Auto Scaling group. By using the capacity-optimized allocation strategy for Spot Instances, Amazon EC2 Auto Scaling will launch instances on the most available Spot Instance pools with the lowest prices. This helps to improve the chances of getting the required capacity at the scheduled times. Adding more instance types to the Auto Scaling group also increases the chances of finding available Spot Instances at any given time. It provides flexibility in selecting different instance types based on the availability and cost of Spot Instances in different pools. Option B (Specify the capacity-optimized allocation strategy for Spot Instances and increase the size of the instances in the Auto Scaling group) might not be the most efficient approach, as simply increasing the instance size may not necessarily address the issue of instances terminating frequently.

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in August 2019 AWS launched the capacity-optimized allocation strategy for Spot Instances, which helps customers tap into the deepest Spot Instance pools by analyzing capacity metrics. Since then, customers have seen a significantly lower interruption rate with capacity-optimized strategy https://aws.amazon.com/blogs/compute/introducing-price-capacity-optimized-allocation-strategy-for-ec2-spot-instances/