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Difficulty: HardResilient and Highly Available Storage Infrastructure

An e-commerce corporation is upgrading the disaster recovery capabilities of its transaction ledger and media catalog storage on AWS. The architecture is primarily based in the `us-east-1` Region and must support failover to the `us-west-2` Region. The media catalog contains millions of image files that require a Recovery Point Objective (RPO) of 1515 minutes and a Recovery Time Objective (RTO) of 1515 minutes. The transaction ledger demands persistent shared file storage that spans multiple Availability Zones in both Regions with minimal recovery time. Which two storage configurations will meet these durability and disaster recovery requirements? (Select TWO.)

  1. Store the media catalog files in an Amazon S3 bucket in `us-east-1` and configure Amazon S3 Cross-Region Replication (CRR) to `us-west-2` with S3 Replication Time Control (RTC) enabled.Answer
  2. Deploy Amazon Elastic File System (Amazon EFS) in `us-east-1` using the Standard storage class to span multiple Availability Zones, and configure Amazon EFS Replication to asynchronously replicate data to a destination EFS file system in `us-west-2`.Answer
  3. C
    Store the media catalog files in Amazon S3 Glacier Flexible Retrieval and use Standard retrieval processes to populate the secondary Region's bucket during a disaster failover event.
  4. D
    Configure a Pilot Light disaster recovery strategy by maintaining cold, inactive Amazon EFS mount targets in the secondary Region, expecting them to instantly mount and synchronize transaction files with zero recovery time during failover.
  5. E
    Deploy an Amazon RDS DB instance with Multi-AZ enabled in `us-east-1` and create a Read Replica in `us-west-2` to act as the primary, highly available file and media storage with automatic failover.

Answer

The correct configurations involve storing the media catalog files in an Amazon S3 bucket with Cross-Region Replication (CRR) and Replication Time Control (RTC) enabled to guarantee replication within fifteen minutes, and using Amazon Elastic File System (Amazon EFS) with EFS Replication to provide highly available, multi-AZ shared storage replicated across regions.
The correct configurations involve storing the media catalog files in an Amazon S3 bucket with Cross-Region Replication (CRR) and Replication Time Control (RTC) enabled to guarantee replication within 1515 minutes, and using Amazon Elastic File System (Amazon EFS) with EFS Replication to provide highly available, multi-AZ shared storage replicated across regions.

Step-by-Step Solution

1
Analyze the RTO and RPO requirements for both storage types.
Identify that the media catalog requires an RTO of 1515 minutes and RPO of 1515 minutes, while the transaction ledger requires multi-AZ persistence and replication to the secondary region with minimal RTO.
Ensures the selected solutions meet the quantitative operational thresholds.
2
Evaluate options for replicating the S3-based media catalog.
Select S3 Cross-Region Replication (CRR) with Replication Time Control (RTC) enabled, which guarantees 99.99%99.99\% of objects replicate within 1515 minutes.
Standard S3 replication is asynchronous without a guaranteed SLA, but RTC ensures the 1515-minute RPO is met.
3
Evaluate options for the shared file storage ledger.
Select Amazon EFS with Standard storage class (spans multiple AZs) combined with Amazon EFS Replication to copy data across Regions.
EFS Replication provides automated cross-region replication for shared file systems, matching the high availability and multi-region resilience requirements.

Key Concept

Designing highly available, multi-AZ and multi-region storage systems using S3 replication configurations and EFS replication schemas to meet low RTO and RPO targets.
Estimated Time:2m 0s
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Topics

Resilient and Highly Available Storage Infrastructure

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