Automate Amazon EBS gp2 to gp3 migration at scale with AWS Step Functions and AWS Lambda

This article describes an automated serverless solution for migrating Amazon EBS volumes from gp2 to gp3 at scale, delivering up to 20% cost savings.

• Uses Step Functions, Lambda, and DynamoDB to orchestrate multi-Region volume discovery and migration
• Performs zero-downtime, in-place conversions using AWS ModifyVolume API
• Includes dry-run analysis to calculate exact savings before executing migrations
• Provides governance controls via AWS Config rules and Service Control Policies
• Tracks migration progress asynchronously with DynamoDB state management
• Generates detailed CSV reports and sends SNS notifications throughout process
• Prevents new gp2 volume creation across AWS Organizations post-migration
• Deploys via CloudFormation with multiple modes: migration, config, scp, or full
• Estimated operational cost: $5–20 per month depending on volume count

The solution automates EBS modernization from discovery through governance, enabling organizations to achieve significant cost savings while preventing regression to older volume types.