A stateful workload will run on Amazon EC2 for the next three years. Which pricing model is the most cost-effective for this long-term, stateful workload?
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Correct answer: Reserved Instances.
Why this is the answer
Reserved Instances (RIs) are the most cost-effective for a long-term, stateful workload because they offer significant discounts (up to 75% compared to On-Demand) in exchange for committing to a one-year or three-year term. Since the workload is stateful and will run for three years, the predictability and duration align perfectly with the RI model. On-Demand Instances are more expensive as they offer no commitment discounts. Dedicated Instances provide dedicated physical servers but don't offer the same cost savings for long-term commitment as RIs. Spot Instances are the least expensive but are unsuitable for stateful workloads due to their interruptible nature, which can lead to data loss or service disruption.
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