DR Testing
Definition
Regularly practicing disaster recovery procedures to ensure they work when needed. Like fire drills that prepare you for real emergencies.
Use Cases
- Netflix: Validate resilience and recovery procedures for critical streaming services during failures — Netflix is known for practicing failure testing (often described as chaos engineering) to ensure systems and operational responses work under stress, including testing how services behave when components fail and verifying recovery runbooks and automation. (Improved service resilience and faster incident response by finding weaknesses before real outages occur.)
- Amazon: Ensure business continuity for large-scale retail and internal services through regular resilience exercises — Amazon has publicly described practices such as game days to simulate failures and validate operational readiness, which aligns with DR testing goals (verifying people, process, and tooling can recover services). (Better operational readiness and reduced risk of prolonged outages by rehearsing recovery actions.)
Frequently Asked Questions
- What's the difference between DR testing and a disaster recovery plan (DR plan)?
- A DR plan is the documented strategy and step-by-step procedures for recovering systems after an outage. DR testing is the act of practicing that plan (for example, running a failover drill) to confirm the steps, tools, and team coordination actually work.
- When should I use DR testing?
- Use DR testing whenever your application has uptime requirements or business impact from downtime. It’s especially important after major changes (new regions, network changes, database migrations), on a regular schedule (monthly/quarterly), and before peak business periods to confirm you can meet your RTO (recovery time objective) and RPO (recovery point objective).
- How much does DR testing cost?
- Costs depend on how your DR is designed and how realistic the test is. Common cost drivers include running duplicate infrastructure in a secondary region, data replication and storage, cross-region network egress, additional licenses, and staff time. A planned failover test may temporarily increase compute and database spend, while tabletop exercises cost mostly staff time but provide less technical validation.
Category: software
Difficulty: basic
Related Terms
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