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Difficulty: HardResilient and Highly Available Storage Infrastructure

A financial technology enterprise is designing the storage architecture for its transactional auditing application. The application processes high-volume trade ledgers that must be stored with high availability and durability. The company requires that all ingested ledger files be replicated across two AWS Regions to support a disaster recovery strategy with a Recovery Point Objective (RPO) of 15 minutes and a Recovery Time Objective (RTO) of 5 minutes. Additionally, older historical ledger archives must be stored cost-effectively for 7 years; these archives are rarely accessed, but when an audit occurs, the data must be fully retrievable within a strict RTO of 2 hours.

Which combination of AWS storage configurations will meet these resilience and recovery requirements? (Select TWO.)

  1. Configure Amazon S3 Cross-Region Replication (CRR) with S3 Replication Time Control (S3 RTC) enabled on the S3 buckets hosting the ledger files.Answer
  2. Transition the historical ledger archives to Amazon S3 Glacier Flexible Retrieval and utilize Expedited retrievals when accessing the data for audits.Answer
  3. C
    Transition the historical ledger archives to Amazon S3 Glacier Deep Archive and utilize Standard retrievals when accessing the data for audits.
  4. D
    Store the ledger files in an Amazon RDS DB instance and create a cross-region Read Replica to achieve automatic cross-region failover within the 5-minute RTO.
  5. E
    Configure an AWS Storage Gateway Tape Gateway in a Pilot Light disaster recovery model to restore the active ledger files to the secondary Region.

Answer

The correct configurations are configuring Amazon S3 Cross-Region Replication (CRR) with S3 Replication Time Control (S3 RTC) enabled on the primary bucket, and transitioning historical archives to Amazon S3 Glacier Flexible Retrieval with Expedited retrievals used during audits.
To achieve an RPO of 15 minutes for object replication between two AWS Regions, enabling Amazon S3 Cross-Region Replication (CRR) with S3 Replication Time Control (S3 RTC) is necessary because S3 RTC provides a service level agreement (SLA) to replicate 99.9% of objects within 15 minutes. To retrieve archived files within a 2-hour RTO during audits, the data must be stored in a class that supports fast retrieval. Amazon S3 Glacier Flexible Retrieval supports Expedited retrievals, which complete within 1-5 minutes, fitting the 2-hour window.

Step-by-Step Solution

1
Identify the replication RPO and RTO for active files.
The active ledger files must be replicated to a second region with an RPO of 15 minutes and an RTO of 5 minutes.
This establishes the performance boundaries for the replication technology selection.
2
Evaluate replication features for Amazon S3.
Amazon S3 Cross-Region Replication (CRR) with S3 Replication Time Control (S3 RTC) replicates 99.9% of objects within 15 minutes.
S3 RTC provides the necessary SLA to meet the strict 15-minute RPO, and replication keeps the data available in the secondary region for immediate retrieval.
3
Analyze the retrieval RTO for historical archives.
Historical archives must be stored cost-effectively for 7 years and retrieved within a 2-hour window during audit events.
This defines the latency limits of the cold storage classes and retrieval tier.
4
Compare Glacier storage classes and retrieval options.
Amazon S3 Glacier Flexible Retrieval with Expedited retrievals restores data in 1 to 5 minutes.
Standard retrieval from Glacier takes 3 to 5 hours, and standard retrieval from Glacier Deep Archive takes 12 hours, meaning only Expedited retrieval meets the 2-hour RTO constraint.

Key Concept

Implementing resilient and highly available multi-region storage systems using S3 replication controls and optimizing lifecycle transitions based on recovery time objectives (RTO).
Estimated Time:2m 30s
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Topics

Resilient and Highly Available Storage Infrastructure

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