Design a Disaster Recovery Plan
Outline a comprehensive Disaster Recovery (DR) strategy for a multi-region deployment. Discuss RPO (Recovery Point Objective), RTO (Recovery Time Objective), and automated failover testing.
Why Interviewers Ask This
Amazon asks this to evaluate your ability to design resilient systems under pressure, a core component of their Leadership Principle of Customer Obsession. They need to see if you can balance cost against availability while defining clear metrics like RPO and RTO. The question tests your capacity to automate failure recovery rather than relying on manual intervention.
How to Answer This Question
1. Begin by clarifying requirements: Ask about the specific business criticality to define acceptable RPO and RTO targets for different services.
2. Define the architecture: Propose an active-active or active-passive multi-region setup using AWS services like Route53 for DNS failover and DynamoDB Global Tables for data replication.
3. Detail the disaster scenarios: Explicitly state how you handle region-wide outages versus local zone failures.
4. Explain automation: Describe using Lambda functions or Step Functions to trigger failover without human delay, ensuring zero-touch recovery.
5. Validate with testing: Outline a 'Game Day' strategy using Chaos Engineering tools to simulate failures regularly, emphasizing that untested plans are not plans at all.
Key Points to Cover
- Explicitly defining RPO and RTO based on business criticality
- Proposing specific AWS services like Route53 and DynamoDB Global Tables
- Emphasizing fully automated failover to remove human error
- Describing a regular chaos engineering or Game Day testing schedule
- Aligning the technical solution with the Customer Obsession leadership principle
Sample Answer
To design a robust DR plan for a multi-region deployment, I first align with stakeholders to define strict RPO and RTO goals. For a customer-facing payment service, we might target an RPO of less than one minute and an R…
Common Mistakes to Avoid
- Focusing solely on backup strategies without addressing real-time traffic routing
- Ignoring the cost implications of active-active vs. active-passive architectures
- Assuming manual intervention is acceptable during a crisis scenario
- Neglecting to mention how data consistency is handled during a split-brain event
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