A multi-Region pilot light keeps the essential recovery foundation and replicated data available in a second AWS Region, but it does not necessarily keep the application ready to serve users there. During a real recovery, teams may still need to create or scale compute, promote a database, verify configuration and secrets, and redirect traffic. The diagram shows where components go; the recovery procedure proves whether they work together.
This is a practical guide to the design and operating work behind that pattern, not a measured account of a specific deployment. AWS’s published recovery-time and recovery-point figures describe strategy-level expectations, not results for an individual workload.
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What a pilot light means on AWS
In AWS’s description, a pilot light keeps core workload infrastructure in a recovery Region and replicates data there, while some application compute remains undeployed until needed. Resources required for replication and backup stay available. During recovery, operators create or activate the remaining infrastructure and application resources, then scale them to the required capacity.
The term is a useful metaphor, but it can obscure what is and is not ready. A recovery Region may contain replicated data and foundational services without having a running, production-capable application. The recovery design must account for every missing component and every action needed to make the workload usable.
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How pilot light differs from warm standby
A warm standby is already a reduced but functional environment capable of accepting traffic; recovery mainly involves scaling it up. A pilot light leaves more of the application environment to be created or activated. AWS Well-Architected Framework REL13-BP02 notes: “The difference between pilot light and warm standby can sometimes be difficult to understand.” The practical distinction is what can serve requests before recovery actions begin.
| Strategy | What remains in the recovery Region | What recovery requires | AWS-published RPO and RTO |
|---|---|---|---|
| Pilot light | Core workload infrastructure and data replication or backup resources; some application compute may be absent. | Create or activate missing infrastructure and application resources, scale them, complete any data-service promotion, and redirect traffic. | AWS Well-Architected Framework gives RPO in minutes and RTO in tens of minutes. AWS Prescriptive Guidance gives RPO in tens of minutes and RTO in tens of minutes for a full stack containing application and database components; its page’s publication date was not displayed. |
| Warm standby | A reduced but functional environment that can accept traffic. | Scale the environment up and direct or expand traffic as required. | AWS Well-Architected Framework gives RPO in seconds and RTO in minutes. |
These are AWS strategy-level ranges, not guarantees or measurements for a particular system. AWS’s two pilot-light descriptions also differ, so they should not be combined into one promised figure. Actual RPO and RTO depend on the workload, replication and service behavior, the recovery actions, and the results of exercises. RPO is the acceptable data-loss interval; RTO is the acceptable time to restore service.
Set recovery objectives before choosing the pattern
Start with the business impact of an outage and data loss, then set an acceptable RTO and RPO for the complete workload. The least expensive recovery design may not meet those objectives. Conversely, deploying a more ready environment can reduce recovery work but adds ongoing cost and operational complexity.
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Define what counts as restored service: for example, whether it means a health check passes, users can complete a critical transaction, or the system has returned to normal capacity. A database that has been promoted while the application is still unavailable is not a complete recovery. Nor is a route change that sends users to an environment unable to serve them.
What must happen during failover
A runbook should describe the transition from a healthy primary Region to a functioning recovery Region, including dependencies and decision points. The exact actions vary by architecture and AWS service, but the sequence commonly needs to cover these areas:
- Decide whether to recover. Establish who can declare an incident, what evidence triggers recovery, and how the team avoids competing or accidental failovers.
- Make the application environment ready. Create or activate resources that were intentionally left undeployed, apply the approved configuration, and bring capacity to the level required by the recovery objective.
- Recover data services. Verify the available recovery point. Where the topology uses a cross-Region read replica, the procedure may need to promote it and then direct the application to the promoted database. Actions differ by database service and topology.
- Verify dependencies and access. Check that the application can reach required services and data, and that its identity permissions, secrets, encryption keys, and network paths work in the recovery Region.
- Redirect traffic. Change routing using the mechanism selected for the architecture, then verify that requests reach a healthy application and that users can complete critical operations.
- Confirm service and communicate status. Use workload-level checks—not only infrastructure health—to decide whether the recovery objective has been met and whether the service is ready for users.
The runbook should assign an owner to each action and specify prerequisites, expected results, failure handling, and any manual approval. Without those details, an attractive diagram can still leave operators guessing about what to do next.
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Replication is not a substitute for backups
Replication helps keep another Region’s data current, but it can also carry unwanted changes such as corruption or deletion. It does not by itself provide a clean point-in-time recovery path. AWS guidance recommends backing up data sources in their Region and copying those backups to the recovery Region.
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Test the backup recovery path as well as replication: confirm that the required backup is available, that the recovery process can restore it, and that the application can use the restored data. A recovery design that relies on a backup should account for the time required to locate, restore, validate, and reconnect that data.
Keep both Regions deployable and consistent
A pilot light may leave compute, capacity, or other dependencies unprovisioned. Those omissions become recovery work. Infrastructure as code and synchronized changes across Regions can reduce manual setup and configuration drift, but they do not make the recovery process self-validating.
Decide how application releases, infrastructure changes, configuration, and access policies reach the recovery Region. Record which components intentionally differ and why. A deployment that succeeds in the primary Region is not proof that it will succeed in the recovery Region: dependencies, permissions, service configuration, and capacity may differ.
- Track which recovery resources are continuously available and which are created or scaled during an incident.
- Make recovery infrastructure changes repeatable, and identify any steps that remain manual.
- Check that the recovery environment has the configuration and dependencies needed by the application version it will run.
- Detect and resolve drift rather than assuming that two Regions remain equivalent.
Choose and validate a traffic-control method
AWS identifies Route 53, Application Recovery Controller, Global Accelerator, and CloudFront as possible options for multi-Region routing. They are not interchangeable checkboxes: the suitable mechanism and whether changes are manual or automatic depend on the architecture and recovery objectives.
Document how traffic changes are initiated and how the team verifies the result. Include routing behavior and any relevant DNS caching or time-to-live effects in exercises; changing a record or routing control does not mean every client immediately reaches the recovery environment. The traffic plan also needs a way to avoid sending users to an environment that is not ready.
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Test the whole recovery path, including control-plane assumptions
A successful deployment or a complete-looking diagram does not demonstrate that the recovery runbook works. AWS recommends testing disaster recovery, automating recovery where appropriate, and managing configuration drift. Exercises should cover the chain of dependencies—from the recovery decision through data availability, application readiness, and traffic redirection—rather than testing isolated components only.
Record actual exercise results, including elapsed recovery time, the recovery point used, failed or delayed steps, and corrective actions. Do not label AWS’s strategy-level RTO or RPO ranges as your own measured result; workload-specific figures can only come from workload-specific tests.
Consider which recovery steps depend on AWS control planes, and validate those assumptions for the architecture. AWS guidance points to Application Recovery Controller readiness checks and routing controls as relevant considerations. That guidance alone does not establish how a particular implementation behaves during a particular control-plane incident; the design and its failure modes require architecture-specific validation.
Account for encryption and service-specific behavior
Cross-Region encryption and replication behavior depend on the service. AWS discusses Region-scoped keys and multi-Region AWS KMS keys as design choices, but the choice must be checked against the exact services, replication setup, permissions, and access paths in use. A copy of encrypted data is not useful for recovery if the application cannot obtain the necessary key access in the recovery Region.
Include key and secrets access in deployment checks and recovery exercises. Verify the actual configuration for each service rather than assuming that replication automatically makes encryption, permissions, and application access ready elsewhere.
Where AWS Elastic Disaster Recovery fits
AWS presents Elastic Disaster Recovery as an option for teams considering pilot light or warm standby. AWS describes the service as using continual data protection, with RPO measured in seconds and RTO measured in minutes, while keeping replication resources deployed until failover or a drill. These are AWS service descriptions, not a guarantee of a particular workload’s results. The service does not remove the need to validate application dependencies, recovery actions, and traffic handling.
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