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Difficulty: EasyResilient and Highly Available Storage Infrastructure

A company is designing a highly resilient storage solution on AWS for its critical media assets. The assets must be protected against accidental deletion, and the architecture must ensure the assets are replicated to a secondary AWS Region to support a disaster recovery plan with a Recovery Time Objective (RTO) of less than 15 minutes. Which two configurations should a solutions architect implement to meet these requirements?

  1. Configure Amazon S3 Cross-Region Replication (CRR) to replicate objects to a bucket in the secondary AWS Region.Answer
  2. B
    Store the assets in Amazon S3 Glacier Flexible Retrieval using standard retrieval options to achieve cross-region disaster recovery.
  3. Enable Amazon S3 Versioning on the source and destination buckets.Answer
  4. D
    Configure Amazon RDS Read Replicas in the secondary AWS Region to handle automatic write failover for the media storage.
  5. E
    Implement a Pilot Light recovery model with active, running EC2 instances in the secondary region to guarantee instant storage failover.

Answer

Configure Amazon S3 Cross-Region Replication (CRR) to replicate objects to a bucket in the secondary AWS Region, and enable Amazon S3 Versioning on the source and destination buckets.
To satisfy both requirements, the solutions architect must configure Amazon S3 Cross-Region Replication (CRR) and enable Amazon S3 Versioning. Versioning ensures that any deleted or overwritten files can be restored, while CRR automatically replicates the files to another AWS Region. Because the files are already copied, they are immediately accessible, keeping the Recovery Time Objective (RTO) well below 15 minutes.

Step-by-Step Solution

1
Enable versioning on the S3 buckets.
S3 Versioning is active, protecting objects from being permanently deleted or overwritten accidentally by keeping historical versions of each object.
This directly satisfies the requirement to protect assets against accidental deletion.
2
Configure Cross-Region Replication (CRR) on the source bucket.
Automatic and asynchronous replication of newly uploaded media assets to the destination bucket in the secondary AWS Region is established.
This satisfies the cross-region disaster recovery requirement while maintaining low RTO because the files are pre-replicated and immediately accessible in the target region.

Key Concept

Designing highly available, durable, and cross-region resilient object storage with Amazon S3 Versioning and Cross-Region Replication (CRR).
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Resilient and Highly Available Storage Infrastructure

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