What would you recommend to minimize costs while being able to provide hill availability?

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In: SOA-C01
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You run a web application where web servers on EC2 Instances are in an Auto Scaling group. Monitoring over the last 6 months shows that 6 web servers are necessary to handle the minimum load During the day up to 12 servers are needed five to six days per year, the number of web servers required might go up to15.

What would you recommend to minimize costs while being able to provide hill availability?

6 Reserved instances (heavy utilization). 6 Reserved instances {medium utilization), rest covered by On-Demand instances

6 Reserved instances (heavy utilization). 6 On-Demand instances, rest covered by Spot Instances

6 Reserved instances (heavy utilization) 6 Spot instances, rest covered by On-Demand instances

6 Reserved instances (heavy utilization) 6 Reserved instances (medium utilization) rest covered by Spot instances

Explanations:

Reserved instances (heavy and medium utilization) might not efficiently handle peak loads of 12 or 15 servers, leading to possible under-provisioning during high-demand periods.

6 Reserved instances (heavy utilization) cover base load, 6 On-Demand instances allow flexibility for peak demand, and Spot Instances help reduce costs for occasional excess capacity.

6 Reserved instances (heavy utilization) provide base capacity, but relying on Spot Instances for peak demand can be risky due to potential interruptions.

Reserved instances (medium utilization) for peak demand may not be sufficient to handle all high-demand scenarios, especially when needing 15 servers.

2025-09-29

1 Comment

  1. Margaret
    Author

    I calculate that the answer is:
    6 Reserved instances (heavy utilization). 6 On-Demand instances, rest covered by Spot Instances

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