A workload is more than its compute resources. Identity, data, scheduled jobs, DNS, external services, and business processes can determine whether the move works as intended. A dependency map gives those relationships a place in the migration decision.
Start with a business service.
Give the workload a consistent name, business purpose, accountable owner, and technical owner. Record the people affected by an outage, the maintenance windows available, and the business periods when change would be difficult.
This context helps the map support decisions beyond infrastructure inventory. It also establishes who can answer questions about the service and who can accept it after the move.
Draw the less visible connections.
Capture application tiers, databases, storage, identity services, external APIs, DNS, caches, scheduled tasks, and load balancers. For each connection, record its direction, purpose, protocol, identity, and owner where known.
Unknown dependencies are useful findings. Mark them explicitly and agree how to investigate them rather than filling the gap with an assumption.
Decide what needs to move together.
Separate immediate, latency-sensitive interactions from occasional integrations and business dependencies. Use that view to define migration groups and a sensible sequence of changes.
When a component remains in the original environment, document the hybrid connection it will need. Check access, performance, recovery, and operational responsibilities before treating that connection as a permanent answer.
Include the operating requirements.
Capture recovery objectives, performance expectations, data sensitivity, licensing constraints, and hosting requirements. Identify who will own platform operations, application support, security decisions, and cost visibility after migration.
Microsoft and AWS migration guidance both place organizational and operational readiness alongside platform decisions. A destination architecture should answer how the service will be run, not only where it will be hosted.
Turn the map into a rehearsal.
Choose test transactions that exercise the whole business workflow. Include the supporting connections, not just whether a server starts or an application page loads. Define acceptance criteria, rollback triggers, and the people authorized to make the cutover decision.
The map becomes more valuable as it is validated. Update it with what the rehearsal shows, and carry the resulting operating knowledge into the handover.
Bring it into the conversation
A practical checklist.
- Does the workload have business and technical owners?
- Are internal and external dependencies visible?
- Have latency-sensitive components been grouped?
- Are hybrid connections and retained systems documented?
- Are performance and recovery requirements measurable?
- Does the rehearsal test the complete workflow?
Further reading
Primary references for the principles discussed in this guide.