A company plans to deploy a workload on AWS that will run continuously for the next year. The workload has predictable, steady-state usage and must have reliable compute capacity available at all times while keeping costs as low as possible. Which Amazon EC2 pricing model should the company choose?
Reserved Instances are the best fit because they offer a significant discount-up to 72 percent compared with On-Demand pricing-in exchange for a one-year commitment to a specific instance configuration. Purchasing a one-year Standard Reserved Instance lets the company run the workload continuously at a lower, predictable hourly rate and, if the reservation is for a specific Availability Zone, also guarantees capacity. Spot Instances provide deeper discounts but can be interrupted with only a two-minute warning, so they are unsuitable for critical steady-state workloads. On-Demand Instances incur the highest cost when used nonstop for a full year. Savings Plans offer comparable discounts but do not reserve capacity, so they do not meet the availability requirement in the same way Reserved Instances can.
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