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Zorluk: OrtaResilient and Highly Available Storage Infrastructure

An enterprise is designing a highly available and resilient storage architecture for a containerized financial reporting application. The application runs on Amazon ECS tasks deployed across three Availability Zones in a single AWS Region. The tasks must concurrently read and write active ledger files and configuration files, requiring sub-millisecond access and strong resilience against Availability Zone failures. The architecture must achieve 99.99%99.99\% availability, protect against data loss with 99.999999999%99.999999999\% (11 9s) durability, and maintain read/write capability across the remaining zones with a Recovery Time Objective (RTO) of near-zero and a Recovery Point Objective (RPO) of zero in the event of a zone outage.

Which of the following configurations should the solutions architect choose to meet these requirements? (Select TWO.)

  1. Provision an Amazon Elastic File System (Amazon EFS) file system using the EFS Standard storage class, and mount it to the container tasks in all three Availability Zones.Cevap
  2. Store the ledger and configuration files in an Amazon S3 bucket configured with the S3 Standard storage class, enabling S3 Versioning and using the AWS SDK for file operations.Cevap
  3. C
    Provision an Amazon EBS volume with Multi-Attach enabled, format it with a clustered file system, and mount it to the tasks across all three Availability Zones.
  4. D
    Store the active files in an Amazon S3 bucket using the S3 Glacier Flexible Retrieval storage class, and configure standard retrievals to fetch the files during container execution.
  5. E
    Deploy an Amazon RDS for PostgreSQL DB instance with a read replica in a second Availability Zone, and mount the replica as a shared block device to the tasks.

Cevap

Deploying an Amazon Elastic File System (Amazon EFS) file system using the EFS Standard storage class, and storing files in an Amazon S3 bucket using the S3 Standard storage class with S3 Versioning enabled.
The correct storage configurations are deploying an Amazon Elastic File System (Amazon EFS) using EFS Standard storage, and using an Amazon S3 bucket with S3 Standard storage and Versioning enabled. Amazon EFS Standard provides a shared filesystem accessible concurrently across multiple Availability Zones with multi-AZ resilience, allowing ECS tasks to continue reading and writing during an AZ outage. Amazon S3 Standard provides 99.999999999%99.999999999\% durability and replicates data across multiple Availability Zones within the region, ensuring zero data loss (RPO of zero) and near-zero RTO with proper versioning configuration.

Adım Adım Çözüm

1
Evaluate the storage sharing and access requirements.
The application requires concurrent read/write access to shared configuration and ledger files across Amazon ECS tasks located in different Availability Zones, needing sub-millisecond access and multi-AZ resilience.
This rules out single-AZ storage solutions and solutions that do not support concurrent multi-AZ access.
2
Analyze Multi-AZ storage options that support concurrent access.
Amazon EFS Standard provides a fully managed shared file system that is distributed across multiple Availability Zones. Amazon S3 Standard stores objects redundantly across multiple Availability Zones and provides high durability and immediate read/write access.
Both EFS Standard and S3 Standard offer multi-AZ replication, meeting the near-zero RTO and zero RPO requirements for zone-level resilience.
3
Examine and eliminate incorrect options based on technical limitations.
EBS Multi-Attach is restricted to a single Availability Zone. S3 Glacier Flexible Retrieval introduces significant retrieval delays. Amazon RDS is a relational database, not a mountable shared file system.
These limitations make the other options unsuitable for a resilient, shared, and low-latency storage solution.

Anahtar Kavram

Resilient multi-AZ shared storage services such as Amazon EFS and Amazon S3 Standard provide automatic replication across multiple Availability Zones, ensuring high availability and durability with near-zero recovery times in case of an AZ outage.
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