Amazon ElastiCache Cost Optimization
ElastiCache nodes are provisioned like RDS — teams pick a node size at setup and rarely revisit it. Redis clusters with multiple replicas across AZs can be very expensive when the actual cache hit rates and memory usage do not justify the configuration. Non-production caches also tend to mirror production sizing.
Common ElastiCache cost waste patterns
Oversized cache nodes
Cache nodes using a fraction of their available memory. A cache.r6g.xlarge (26 GB) running at 4 GB utilization is paying for 22 GB of unused memory.
Too many replicas
Redis replication groups with more read replicas than read traffic justifies. Each replica is a full-cost node.
Non-production mirroring production size
Dev and staging caches using the same node type and replica count as production despite handling a fraction of the traffic.
How to reduce your ElastiCache costs
Rightsize based on memory utilization
Save 30-50% mediumCheck CloudWatch DatabaseMemoryUsagePercent and BytesUsedForCache. If memory usage is consistently below 40%, downsize to the next smaller node type.
Reduce replicas in non-production
Save 50-66% easyDev and staging environments rarely need read replicas. Reduce to a single node to cut costs by 50-66% per cluster.
Use Reserved Nodes for production
Save 40-55% advancedElastiCache Reserved Nodes offer up to 55% savings over on-demand for 1-3 year terms. Worth it for stable production caches.
How ZapStack finds ElastiCache waste
ZapStack automatically scans your AWS environment and surfaces ElastiCache cost savings you can action immediately.
- Detects oversized cache nodes using memory metrics
- Identifies clusters with excess replicas
- Flags non-production clusters matching production sizing
- Calculates per-node savings from rightsizing
- Recommends Reserved Node purchases for steady-state caches
Frequently asked questions about ElastiCache costs
Related AWS services
RDS Cost Optimization
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DynamoDB Cost Optimization
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EC2 Cost Optimization
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