Large infrastructure migrations are easier to control when the target architecture, dependencies, change windows, validation checks, and rollback criteria are written before the first production move.
Patterns used in project delivery
- Break the migration into dependency-aware waves.
- Document what must be true before each change starts.
- Define technical and business validation for each wave.
- Agree on rollback criteria before the implementation window.
- Keep decommissioning as a planned project phase rather than an afterthought.
This note draws on client-confidential data-centre migration and decommissioning case studies.