Examkin

Question

Difficulty: HardResilient and Highly Available Storage Infrastructure

A global legal technology platform hosts sensitive litigation documents consisting of scanned court files. The documents must be stored with 99.999999999%99.999999999\% (11 nines) of durability. The platform must maintain a disaster recovery plan across two AWS regions (primary and secondary) with a Recovery Point Objective (RPO) of 15 minutes and a Recovery Time Objective (RTO) of 15 minutes for its storage tier. The files are frequently accessed during the first 30 days of active litigation, after which access drops significantly; however, any document must remain retrievable within milliseconds when requested. Which storage architecture meets these requirements with the lowest operational overhead?

  1. Store the litigation documents in an Amazon S3 bucket in the primary region. Configure S3 Cross-Region Replication (CRR) with S3 Replication Time Control (S3 RTC) enabled to replicate the documents to an S3 bucket in the secondary region. Apply an S3 Lifecycle policy to transition the documents to S3 Glacier Instant Retrieval after 30 days.Answer
  2. B
    Store the litigation documents in an Amazon S3 bucket in the primary region. Configure S3 Cross-Region Replication (CRR) to replicate the documents to an S3 bucket in the secondary region. Apply an S3 Lifecycle policy to transition the documents to S3 Glacier Flexible Retrieval after 30 days, using standard retrievals during a failover event.
  3. C
    Store the litigation documents on an Amazon EBS gp3 volume. Enable EBS Multi-Attach to share the volume across multiple Amazon EC2 instances located in different Availability Zones within the primary region, and configure EBS snapshot copy to the secondary region every 15 minutes.
  4. D
    Store the litigation documents in an Amazon S3 bucket in the primary region. Implement a Pilot Light disaster recovery strategy where documents are backed up daily using AWS Backup to the secondary region, and restore the storage infrastructure in the secondary region only when a failover is initiated.

Answer

Store the litigation documents in an Amazon S3 bucket in the primary region. Configure S3 Cross-Region Replication (CRR) with S3 Replication Time Control (S3 RTC) enabled to replicate the documents to an S3 bucket in the secondary region. Apply an S3 Lifecycle policy to transition the documents to S3 Glacier Instant Retrieval after 30 days.
The correct strategy uses S3 Cross-Region Replication (CRR) with S3 Replication Time Control (S3 RTC) to replicate objects to a secondary region within 15 minutes, satisfying the 15-minute RPO. Transitioning the objects to S3 Glacier Instant Retrieval after 30 days reduces costs while maintaining millisecond retrieval speeds, satisfying the RTO and immediate access requirement when a case is reopened.

Step-by-Step Solution

1
Evaluate the durability and recovery point (RPO) constraints.
Amazon S3 provides 99.999999999%99.999999999\% (11 nines) of durability. To achieve a 15-minute RPO across regions, S3 Cross-Region Replication (CRR) with S3 Replication Time Control (S3 RTC) must be used, which guarantees replication of 99.99% of objects within 15 minutes.
Standard CRR does not guarantee a replication completion time, which could violate the RPO during peak load, while S3 RTC provides a SLA-backed replication timeframe.
2
Evaluate the recovery time (RTO) and access latency constraints.
The documents must be retrievable in milliseconds. S3 Glacier Instant Retrieval meets this requirement, whereas standard Glacier storage classes introduce hours of retrieval latency.
Court discovery workflows require rapid, millisecond access even for archived files, making Glacier Instant Retrieval the only cost-effective archive class that meets the latency target.
3
Determine the optimal cost optimization strategy.
An S3 Lifecycle policy can transition objects from S3 Standard to S3 Glacier Instant Retrieval after 30 days.
This automatically reduces storage costs for historical litigation documents while preserving the ability to retrieve them in milliseconds when a case is reopened.

Key Concept

Designing a multi-region resilient storage architecture using Amazon S3 Cross-Region Replication with Replication Time Control (S3 RTC) and cost-optimizing with S3 Glacier Instant Retrieval for millisecond access latency.
Estimated Time:2m 0s
Rate this question

Topics

Resilient and Highly Available Storage Infrastructure

More questions from this topic