Insights · Field note · Infrastructure and resilience
Disaster recovery planning for environments that cannot pause
Some services cannot stop for a recovery test, a failover or a rebuild. The plan has to be designed and proven around that constraint.
Disaster recovery planning for an environment that cannot pause, a hospital network, a utility control system, a logistics platform, a trading operation, means designing recovery that can be built and tested without taking the service down: redundant components that can be failed over one at a time, recovery environments that can be exercised in isolation, restores proven into parallel systems, and staged tests that grow from a single component to a full service without ever interrupting the live one. NIST SP 800-34 describes contingency planning; the constraint of continuous operation changes how its steps are executed, not whether they are.
In detail
What the evidence shows.
Design for testability
Recovery that can only be tested by causing an outage will never be tested. Redundancy that allows one component to be failed over while the other carries load, recovery environments isolated from production, and restore targets that are parallel rather than in-place make testing possible. The design decision is made before the plan is written.
Order and dependencies
The business impact analysis ranks services and sets the tolerances. The dependency map shows what must come back before what. The plan states the order, the procedures and the copies. In environments that cannot pause, the order also states what keeps running on degraded mode while recovery proceeds.
Staged testing
Component restores first. Then an application into isolation. Then a service with dependencies. Then a failover of a redundant component under load. Each stage is timed and recorded, and the evidence accumulates toward a demonstrated capability without a single planned outage.
Working with operations
Windows agreed with the people who run the service. Rollback for every step. Observation during the test from the operations team. Recovery for these environments is a joint discipline, which is why our work is coordinated with operations rather than imposed on it. See disaster recovery planning, disaster recovery test plan template and the critical-service operators industry page.
By David Selakovic · Published 2026-10-16 · Revised 2026-10-16 · Reviewed every 180 days