ISC2 Certified Cloud Security Professional (CCSP) Practice Question
A retail company is moving its order-processing system to an IaaS provider. The business mandate states that, after a regional outage, the application must be available again within 4 hours and must not lose more than 30 minutes of data. Which disaster-recovery deployment pattern should the cloud architect recommend to meet these requirements at the lowest acceptable cost?
Daily volume snapshots to object storage in a second region with servers rebuilt only after an outage
Active-active multi-site deployment with real-time replication and full production capacity in both regions
Warm standby environment where application and database servers run in a second region, updated every 6 hours
Pilot-light environment in a secondary region with continuous (synchronous or near-synchronous) database replication
The stated recovery time objective (RTO) is 4 hours and the recovery point objective (RPO) is 30 minutes. A pilot-light pattern keeps a minimal secondary environment (usually the databases) running and updates data continuously-commonly through synchronous or near-synchronous replication-so recent transactions are protected within the 30-minute RPO. When a disaster occurs, additional application servers are launched from images or automation scripts and pointed at the already-running data tier, allowing service restoration well inside the 4-hour RTO. A daily snapshot strategy cannot meet a 30-minute RPO, and an asynchronous 6-hour replication scheme also fails that requirement. An active-active multi-site design easily meets both RTO and RPO but is significantly more expensive to operate because full capacity is running in two regions at all times, contradicting the "lowest acceptable cost" constraint. Therefore, a pilot-light architecture with continuous data replication is the best fit.
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ISC2 Certified Cloud Security Professional (CCSP)
Cloud Platform & Infrastructure Security
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