Q: You need to implement a DR (Disaster Recovery) strategy for a business-critical app on AWS. Walk me through options.
Options by RPO/RTO: Backup & Restore (hours RPO/RTO, cheapest) → Pilot Light (critical infra always on, warm data, minutes to hours) → Wa...
#AWS #Cost & Architecture #L3 #Cloud #Infrastructure
🎙️ Candidate Opening & Architectural Context
""AWS reliability requires differentiating between AWS control plane limits and host-level resource exhaustion. When addressing this question, I walk the interviewer through our production incident runbook: isolating the blast radius, checking diagnostic logs and metrics, and applying a safe fix.""
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🛠️ Production Runbook & Step-by-Step Resolution
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Production Solution & Architecture
Options by RPO/RTO: Backup & Restore (hours RPO/RTO, cheapest) → Pilot Light (critical infra always on, warm data, minutes to hours) → Warm Standby (scaled-down copy always running, minutes) → Multi-Site Active-Active (near-zero RPO/RTO, most expensive). Choose based on cost vs business SLA.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Options by RPO/RTO: Backup & Restore (hours RPO/RTO, cheapest) → Pilot Light (critical infra always on, warm data, minutes to hour."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: Options by RPO/RTO: Backup & Restore (hours RPO/RTO, cheapest) → Pilot Light (critical infra al
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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