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Amazon ElastiCache
User Guide (API Version 2015-02-02)

Reserved Node Offerings

Heavy Utilization reserved cache nodes enable workloads that have a consistent baseline of capacity or run steady-state workloads. Heavy Utilization reserved cache nodes require the highest up-front commitment, but if you plan to run more than 79 percent of the reserved cache node term you can earn the largest savings (up to 70 percent off of the On-Demand price). Unlike the other reserved cache nodes, with Heavy Utilization reserved cache nodes you pay a one-time fee, followed by a lower hourly fee for the duration of the term regardless of whether or not your cache node is running.

Medium Utilization reserved cache nodes are the best option if you plan to leverage your reserved cache nodes a substantial amount of the time, but you want either a lower one-time fee or the flexibility to stop paying for your cache node when you shut it off. Medium Utilization reserved cache nodes are a more cost-effective option when you plan to run more than 40 percent of the reserved cache nodes term. This option can save you up to 64 percent off of the On-Demand price. With Medium Utilization reserved cache nodes, you pay a slightly higher one-time fee than with Light Utilization reserved cache nodes, and you receive lower hourly usage rates when you run a cache node.

Light Utilization reserved cache nodes are ideal for periodic workloads that run only a couple of hours a day or a few days per week. Using Light Utilization reserved cache nodes, you pay a one-time fee followed by a discounted hourly usage fee when your cache node is running. You can start saving when your cache node is running more than 17 percent of the reserved cache node term, and you can save up to 56 percent off of the On-Demand rates over the entire term of your reserved cache node.

Reserved Cache Node Offerings

Offering Up-Front Cost Usage Fee Advantage

Heavy Utilization

Highest

Lowest hourly fee. Applied to the whole term whether or not you're using the reserved cache node.

Lowest overall cost if you plan to use your reserved cache nodes more than 79 percent of a three-year term.

Medium Utilization

Average

Hourly usage fee charged for each hour you use the cache node.

Suitable for elastic workloads or when you expect moderate usage, more than 40 percent of a three-year term.

Light Utilization

Lowest

Hourly usage fee charged. Highest fees of all the offering types, but fees apply only when you're using the reserved cache node.

Highest overall cost if you plan to run all of the time; however, lowest overall cost if you anticipate you will use your reserved cache nodes infrequently, more than about 15 percent of a three-year term.