AWS Certified Solutions Architect Professional SAP-C02 Practice Question
Your company replicates its on-premises application servers to AWS by using AWS Elastic Disaster Recovery (AWS DRS). Continuous block-level replication is already configured and the servers appear as Ready for recovery in the AWS DRS console for the us-west-2 Region. Management now mandates a warm standby disaster-recovery strategy so the DR Region can immediately process a small amount of user traffic while keeping monthly operating costs low. You must meet an RTO of 15 minutes and an RPO of seconds.
Which approach will satisfy these requirements?
Launch the recovery instances once, keep them running on smaller EC2 instance types behind an Application Load Balancer, and use Auto Scaling policies to resize the fleet to production sizes only after a failover is declared.
Replace AWS DRS with cross-Region backups managed by AWS Backup and restore the servers with AWS CloudFormation during a disaster drill; route traffic to the DR Region by changing Route 53 weights.
Enable instance-type right-sizing in the AWS DRS launch template so that matching C5 instances are chosen automatically; do not keep any recovery instances running before a disaster.
Keep the default AWS DRS configuration, which maintains switched-off resources in the staging area and launches production-sized instances only when a recovery job starts.
AWS DRS on its own implements a pilot-light pattern: it keeps data and conversion resources in a staging area and launches EC2 instances only when you start a recovery job. A warm-standby pattern, by contrast, requires a scaled-down but running copy of the workload that can accept traffic immediately. The correct approach therefore launches the recovery instances once (for example during a drill), keeps them running on cost-optimized instance types behind a load balancer, and relies on Auto Scaling or scripted post-launch actions to resize the fleet to production capacity when failover is declared. The other options either leave all instances powered off (still pilot light), change launch-template settings without keeping servers running, or replace AWS DRS with a backup/restore process that cannot meet the 15-minute RTO.
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What is the difference between a pilot-light and a warm-standby disaster recovery pattern?
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Why is continuous block-level replication important in AWS Elastic Disaster Recovery (AWS DRS)?
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AWS Certified Solutions Architect Professional SAP-C02
Design Solutions for Organizational Complexity
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