What's changed: In-scope coverage: added compute placement (Elastic Beanstalk/Outposts/VMware Cloud on AWS/Wavelength/Serverless Application Repository/ECS Anywhere/EKS Anywhere/EKS Distro), cost visibility (Cost and Usage Report/Compute Optimizer/License Manager), and management/governance (CloudFormation/Service Catalog/Control Tower/Systems Manager/CloudWatch/X-Ray/Managed Grafana/Managed Service for Prometheus/Health Dashboard/Well-Architected Tool/Management Console) across sections
4.2Storage Cost Optimization
Understand S3 storage classes (Standard / Standard-IA / Glacier), lifecycle policies, and optimizing cost by choosing the right storage.
Storage cost is optimized by choosing a class based on access frequency. S3 offers storage classes for different needs.
4.2.1S3 storage classes
- S3 Standard: for frequently accessed data; higher storage cost, but no retrieval fee and fast access.
- S3 Standard-IA / One Zone-IA: infrequent access, cheaper storage (retrieval fee); One Zone-IA is cheaper in a single AZ with less redundancy.
- S3 Glacier (Instant/Flexible/Deep Archive): cheapest for archival; retrieval takes time (Deep Archive is cheapest/slowest).
- S3 Intelligent-Tiering: auto-moves objects to the optimal class by access frequency when patterns are unknown.
- Lifecycle policies: auto-transition to cheaper classes or delete over time.
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