Episode
[AWS] Migration Decision Framework
- Published
- Feb 22, 2026
- Duration seconds
- 2839
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Summary
Migration Decision Framework and real-world case studies that closely align with enterprise architecture principles. Here is a summary of the core migration strategies covered in your current documents: Migration Decision Framework The sources outline a strategic framework for deciding how to migrate enterprise workloads, evaluating factors like time pressure, cost, risk, and team skills: Rehost (Lift & Shift): This is the best approach when there is high time pressure, such as a looming data center hardware refresh. It involves moving assets directly to the cloud (e.g., on-prem VMs to AWS EC2) requiring low cloud skills and offering low immediate risk, but also low initial cost optimization. Replatform: A middle-ground approach that involves light optimizations, such as moving VMs to containers (like ECS) or migrating self-managed databases to managed services, without completely rewriting the application's core architecture. Refactor: This approach requires high cloud skills and time but delivers the highest long-term cost optimization and business value. It involves fully modernizing the architecture, such as breaking a monolithic application into microservices or serverless functions. Repurchase & Retire: Retiring involves decommissioning unused applications, while repurchasing means replacing legacy tools with modern SaaS equivalents (e.g., replacing an on-prem CRM with Salesforce). Key Enterprise Architecture Themes in the Case Studies: Phased Modernization ("Migrate then Modernize"): Rather than refactoring massive monolithic applications immediately, architects often propose a phased approach. For example, in the E-Commerce case study, the monolith is first rehosted to buy time and eliminate data center risk, and then refactored into microserv…