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Difficulty: MediumResilient and Highly Available Storage Infrastructure

A healthcare provider is deploying a medical imaging application on Amazon EC2 instances across multiple Availability Zones in a primary AWS region. The application requires a shared file system that supports POSIX-compliant file operations and allows concurrent read and write access from all EC2 instances. Additionally, the provider requires a disaster recovery strategy to replicate this shared storage to a secondary AWS region with a Recovery Point Objective (RPO) of less than 15 minutes. Which combination of storage configurations will meet these requirements? (Select TWO.)

  1. Create an Amazon Elastic File System (Amazon EFS) file system in the primary region and mount it on the EC2 instances using EFS mount targets in each Availability Zone.Answer
  2. Enable Amazon EFS Replication to replicate the file system to a destination EFS file system in the secondary AWS region.Answer
  3. C
    Provision Amazon EBS gp3 volumes with Multi-Attach enabled in the primary region, and use Amazon Data Lifecycle Manager (DLM) to replicate snapshots to the secondary region every 15 minutes.
  4. D
    Store the images in an Amazon S3 Glacier Flexible Retrieval vault and mount the vault directly to the EC2 instances across multiple Availability Zones.
  5. E
    Deploy an Amazon RDS Multi-AZ DB instance and configure cross-region read replicas to serve as the shared file storage.

Answer

The correct configuration is to create an Amazon EFS file system with mount targets in each Availability Zone in the primary region, and then configure Amazon EFS Replication to replicate file system data to a destination EFS file system in the secondary AWS region.
Creating an Amazon EFS file system in the primary region provides a scalable, highly available shared storage layer that can be concurrently mounted by EC2 instances across different Availability Zones. Configuring EFS Replication to a destination file system in the secondary region ensures automated cross-region replication that aligns with an RPO of less than 15 minutes.

Step-by-Step Solution

1
Identify the file sharing and access requirements for the EC2 instances.
The application requires concurrent read and write access to a shared POSIX-compliant file system across multiple Availability Zones.
This points to Amazon EFS as the appropriate storage service, since standard block storage (Amazon EBS) does not support multi-AZ sharing, and object storage (Amazon S3) is not POSIX-compliant.
2
Select the cross-region disaster recovery mechanism that meets the RPO requirement.
The solution must replicate storage to a secondary region with an RPO of less than 15 minutes.
Amazon EFS Replication satisfies this by continuously replicating file system modifications to a destination EFS file system in the secondary region with a typical RPO of minutes.

Key Concept

Cross-region disaster recovery and high availability for shared file systems using Amazon EFS and EFS Replication.
Estimated Time:2m 0s
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Resilient and Highly Available Storage Infrastructure

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