Outdated ElastiCache Node Type

Service Category

Cloud Provider

AWS

Service Name

AWS ElastiCache

Inefficiency Type

Overprovisioned Resource

Explanation

Some ElastiCache clusters continue to run on older-generation node types that have since been replaced by newer, more cost-effective options. This can happen due to legacy templates, lack of version validation, or infrastructure that has not been reviewed in years. Newer instance families often deliver better performance at a lower hourly rate. Modernizing to newer node types can reduce compute spend without sacrificing performance, and in many cases, improve it.

Relevant Billing Model

ElastiCache nodes are billed hourly based on instance type, engine (Redis or Memcached), and AWS region. Older-generation node types (e.g., M3, T2, R3) often have higher hourly rates and lower performance efficiency compared to newer generations (e.g., M6g, R6g, T4g), especially those powered by AWS Graviton processors. Costs accrue continuously while nodes are running.

Detection

Identify ElastiCache nodes running on older-generation instance types (e.g., T2, M3, R3)
Compare current node types to newer generation equivalents that offer the same size and better price/performance (e.g., M6g, R6g, T4g)
Evaluate whether there are operational or application constraints that prevent an upgrade
Confirm that your current Redis or Memcached version is supported on the target node type, and upgrade the engine version if required before migrating.
Engage with infrastructure or platform teams to validate upgrade feasibility and timing

Remediation

Upgrade ElastiCache clusters from older-generation node types to newer instance families that offer improved performance and reduced cost. Use AWS documentation to identify compatible replacements and ensure support for your Redis or Memcached version. Plan upgrades during a maintenance window to minimize disruption. Consider Graviton-based nodes for additional savings where supported.

Relevant Documentation

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