Outdated ElastiCache Node Type

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.

ElastiCache nodes are billed hourly based on instance type, engine (Redis or Memcached), and AWS region. Older-generation node types (e.g., T2, or legacy M3 and R3 nodes still running) often have higher hourly rates and lower performance efficiency compared to current generations (e.g., M7g, R7g, T4g, or M8g and R8g where the engine supports them), especially those powered by AWS Graviton processors. Previous-generation node types can no longer be used for new clusters, but existing nodes keep running and billing until upgraded. Costs accrue continuously while nodes are running.

• Identify ElastiCache nodes running on older-generation instance types (e.g., T2, or legacy M3 and R3)
• Compare current node types to newer generation equivalents that offer the same size and better price/performance (e.g., M7g, R7g, 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

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.

• Amazon ElastiCache Pricingaws.amazon.com
• Supported node types - Amazon ElastiCachedocs.aws.amazon.com