AWS Rightsizing Visibility: AWS Compute Optimizer and S3 Storage Lens

This guide covers the critical visibility tools used by AWS Solutions Architects to optimize infrastructure costs and performance through rightsizing, specifically focusing on AWS Compute Optimizer and Amazon S3 Storage Lens.

Learning Objectives

After studying this guide, you should be able to:

• Evaluate infrastructure for over-provisioning and under-provisioning using Machine Learning insights.
• Implement a continuous rightsizing strategy across multi-account environments.
• Interpret S3 Storage Lens metrics to identify cost-optimization opportunities in storage.
• Differentiate between AWS Compute Optimizer, Trusted Advisor, and Cost Explorer for visibility tasks.

Key Terms & Glossary

• Rightsizing: The process of matching instance types and sizes to your workload performance and capacity requirements at the lowest possible cost.
• Over-provisioned: A resource (e.g., EC2) that is larger than necessary for its workload, leading to wasted spend.
• Under-provisioned: A resource that lacks sufficient capacity, potentially causing performance bottlenecks or application failure.
• P95 Metrics: The 95th percentile of a metric (like CPU usage), often used by AWS Compute Optimizer to ignore extreme outliers.
• Storage Class: S3 categories (Standard, IA, Glacier) designed for specific data access patterns.

The "Big Idea"

[!IMPORTANT] Rightsizing is not a "one-and-done" task; it is a continuous cycle. In the cloud, demand is elastic, and AWS constantly releases new, more efficient instance families. The