Ensure that the reservation coverage percentage (i.e. the percentage of node instance hours that a reservation covered) available for your Amazon ElastiCache Reserved Cache Nodes (RCNs) does not fall below a target threshold. Reserved Cache Node (RCN) coverage tracks the number of running node hours that are covered by reservations, and can be measured over a daily, monthly, quarterly, or yearly cadence. For example, you can monitor your RCN coverage either at an aggregate level (e.g. monthly coverage of your entire Amazon ElastiCache RCN fleet) or at a more granular level of detail (e.g. monthly coverage of Amazon ElastiCache cache.m4.large nodes running within Asia Pacific - Tokyo region). The reservation coverage threshold (percentage) and the time period to retrieve the reservation coverage data for, must be defined in the conformity rule settings, on the Trend Micro Cloud One™ – Conformity account console.
This rule can help you work with the AWS Well-Architected Framework.
Amazon ElastiCache RCN reservations provide a significant discounted hourly rate (up to 75%) compared to On-Demand pricing, helping you to cut down on your ElastiCache costs. The Reserved Cache Node (RCN) coverage report produced by Amazon Cost Management service allows you to discover how much of your overall ElastiCache node usage is covered by RCNs, so that you can make informed decisions about when to purchase or modify a Reserved Cache Node to ensure maximum reservation coverage. The Cost Management service provides effective recommendations for which reservations to purchase in order to help you reduce your Amazon ElastiCache costs.
To determine if the reservation coverage (percentage) of your Amazon ElastiCache Reserved Cache Nodes fall below your target coverage, perform the following actions:
Remediation / Resolution
To ensure maximum reservation coverage for your Amazon ElastiCache Reserved Cache Nodes (RCNs), follow the context-aware RCN purchase recommendations provided by Amazon Cost Management service to optimize your AWS costs by performing the following actions:
- AWS Documentation
- Reserved Instance (RI) Reporting
- Best practices for AWS Budgets
- Managing your costs with AWS Budgets
- Accessing Reserved Instance Recommendations
- Amazon ElastiCache Reserved Nodes
- Managing Costs with Reserved Nodes
- AWS Command Line Interface (CLI) Documentation
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ElastiCache Reserved Cache Node Coverage
Risk level: Medium