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Difficulty: MediumResilient and Highly Available Storage Infrastructure

A financial company hosts an auditing application on AWS. The application stores large transaction logs that must be retained for compliance. In the event of a regional outage, the company needs to recover the application in a secondary AWS Region. The recovery solution must achieve a Recovery Time Objective (RTO) of 2020 minutes and a Recovery Point Objective (RPO) of 11 hour.

Which storage and disaster recovery configuration meets these requirements?

  1. Store the transaction logs in an Amazon S3 bucket in the primary Region. Configure S3 Cross-Region Replication (CRR) to replicate the logs to an S3 Standard bucket in the secondary Region, and deploy a Warm Standby environment in the secondary Region.Answer
  2. B
    Store the transaction logs in an Amazon S3 bucket. Configure S3 Cross-Region Replication to copy the logs to Amazon S3 Glacier Flexible Retrieval in the secondary Region, and use standard retrieval to access the logs during a disaster.
  3. C
    Store the transaction logs in Amazon S3. In the secondary Region, implement a Pilot Light disaster recovery strategy where all backup storage volumes and compute environments are provisioned and restored from snapshots only after a failover is initiated.
  4. D
    Store the transaction logs in an Amazon RDS database with Multi-AZ enabled, and configure a cross-region Read Replica to automatically perform a failover and promote itself to the primary database when the primary Region goes offline.

Answer

Store the transaction logs in Amazon S3 and replicate them using Cross-Region Replication to a secondary Region with S3 Standard, and deploy a Warm Standby environment in the secondary Region.
The correct answer combines Amazon S3 Cross-Region Replication (CRR) and a Warm Standby DR pattern. S3 CRR replicates transaction logs to a secondary Region within minutes, satisfying the 1-hour RPO. A Warm Standby deployment maintains scaled-down but active compute resources in the secondary Region, allowing the system to be scaled up and serve traffic within 20 minutes, thus satisfying the 1-hour RPO and 20-minute RTO requirements.

Step-by-Step Solution

1
Analyze RPO requirements
An RPO of 1 hour requires the storage layer to replicate data to the secondary Region in less than 1 hour.
Amazon S3 Cross-Region Replication (CRR) replicates objects within minutes, meeting the 1-hour RPO.
2
Analyze RTO requirements
An RTO of 20 minutes requires application infrastructure to be ready to handle traffic rapidly, which cannot be met by deploying resources from scratch or restoring backups dynamically.
A Warm Standby disaster recovery strategy provides a scaled-down but active copy of the infrastructure, allowing failover to complete well within the 20-minute limit.
3
Evaluate the database replication strategy
RDS Read Replicas do not support automatic cross-region failover, meaning manual promotion is required, which may not reliably fit the recovery process without pre-warmed infrastructure.
Correct database failover must be handled as part of the overall application recovery strategy, using multi-region replica promotion or manual orchestration within the Warm Standby framework.

Key Concept

Designing multi-region disaster recovery using S3 Cross-Region Replication and a Warm Standby architecture to meet strict RTO and RPO requirements.
Estimated Time:1m 30s
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Topics

Resilient and Highly Available Storage Infrastructure

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