AWS Reserved Instances Optimization Handbook.
Reserved Instances were AWS's first long-term commitment construct, and they are still the right tool for a specific set of workloads — primarily RDS, ElastiCache, Redshift, OpenSearch, and DynamoDB capacity. This handbook documents the com
What's inside.
Reserved Instances were AWS's first long-term commitment construct, and they are still the right tool for a specific set of workloads — primarily RDS, ElastiCache, Redshift, OpenSearch, and DynamoDB capacity. This handbook documents the complete RI strategy for the workloads where Savings Plans don't apply, plus the cleanup playbook for legacy EC2 RIs that should now be converted to Savings Plans. It is built on 500+ AWS engagements and $2.4 billion in reviewed spend.
Most enterprise customers have a mixed RI portfolio that has accumulated over years — Standard RIs, Convertible RIs, regional and zonal RIs, RIs marked for sale on the RI Marketplace, and forgotten RIs running against decommissioned workloads. This handbook provides the audit framework to inventory that portfolio, the conversion logic for each RI type, and the negotiation strategy for new RI commitments against the services Savings Plans don't cover.
The white paper also addresses the harder question of size flexibility and family normalization. RDS RIs in particular have non-obvious flexibility characteristics that materially change the optimization math, and most internal teams apply RDS RI strategy as if it were identical to EC2 — producing systematically suboptimal portfolios.
Table of contents
- Executive summary — when Reserved Instances are still the right tool
- RI portfolio audit framework — inventory, ownership, and utilization analysis
- Standard vs. Convertible RI economics by service and term
- RDS RI size flexibility and family normalization mechanics
- ElastiCache, Redshift, OpenSearch, and DynamoDB RI strategy
- Legacy EC2 RI cleanup — when to convert, when to sell, when to let expire
- RI Marketplace mechanics — pricing, fees, and timing
- Cross-region and cross-account RI sharing under AWS Organizations
- Appendix A — RI portfolio audit template
- Appendix B — conversion decision tree for each RI type
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Built on 500+ engagements.
Every figure, benchmark, and recommendation in this white paper is grounded in primary data from real AWS negotiation engagements. We have advised on more than $2.4 billion in AWS spend across 500+ engagements, spanning financial services, SaaS, media, retail, healthcare, public sector, and AI-native companies. The data set is anonymized and aggregated; no individual customer agreement is identifiable.
This white paper is buyer-side analysis. It is not affiliated with, sponsored by, or reviewed by Amazon Web Services. The recommendations reflect what works in negotiation against AWS's standard playbook, not AWS's preferred customer behavior. Where the two diverge, we have written from the customer's perspective.
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