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Difficulty: HardResilient and Highly Available Storage Infrastructure

A financial auditing enterprise hosts its document archiving application on AWS. The primary storage consists of an Amazon S3 bucket located in us-east-1 containing compliance records. The company must establish a disaster recovery (DR) site in us-west-2 that guarantees a Recovery Point Objective (RPO) of 1515 minutes and a Recovery Time Objective (RTO) of 1515 minutes. The data must be stored with a durability of 99.999999999%99.999999999\%. Which storage architecture meets these requirements?

  1. Configure Amazon S3 Cross-Region Replication (CRR) to a destination S3 bucket in us-west-2 with S3 Replication Time Control (S3 RTC) enabled, and run the application in an active-passive configuration.Answer
  2. B
    Configure Amazon S3 Cross-Region Replication (CRR) to replicate compliance records to the Amazon S3 Glacier Flexible Retrieval storage class in us-west-2, and initiate Standard retrievals during a disaster recovery failover event.
  3. C
    Implement a Pilot Light disaster recovery strategy where compliance records are replicated to Amazon S3 in us-west-2 with the compute resources kept offline, expecting automated scripts to boot and scale the application tier within the 1515-minute RTO.
  4. D
    Migrate the record storage to an Amazon RDS Multi-AZ DB instance in us-east-1, configure a Read Replica in us-west-2, and promote the Read Replica during a failover to serve as the highly available storage tier.

Answer

Configure Amazon S3 Cross-Region Replication (CRR) to a destination S3 bucket in us-west-2 with S3 Replication Time Control (S3 RTC) enabled, and run the application in an active-passive configuration.
The correct solution uses Amazon S3 Cross-Region Replication (CRR) with S3 Replication Time Control (S3 RTC). S3 RTC guarantees that 99.9%99.9\% of uploaded objects are replicated to the destination region within 1515 minutes, directly fulfilling the 1515-minute RPO. Because the files are replicated to standard S3 storage, they are immediately accessible during a failover event, easily satisfying the 1515-minute RTO. Amazon S3 Standard also natively provides 99.999999999%99.999999999\% data durability.

Step-by-Step Solution

1
Analyze the durability and recovery metrics required by the business scenario.
The platform needs 99.999999999%99.999999999\% (11 nines) durability, an RPO of 1515 minutes, and an RTO of 1515 minutes.
These constraints narrow the storage target to Amazon S3 Standard (for durability) and require a replication mechanism that completes within 1515 minutes with immediate data availability.
2
Evaluate the replication options for Amazon S3 across regions.
Standard Amazon S3 Cross-Region Replication (CRR) does not provide a replication time guarantee, but enabling S3 Replication Time Control (S3 RTC) guarantees replication of 99.9%99.9\% of objects within 1515 minutes.
To satisfy a strict 1515-minute RPO, a replication time SLA like S3 RTC is required to ensure files are copied to the secondary region within the threshold.
3
Evaluate the accessibility of replicated storage classes in the secondary region.
Objects replicated to S3 Standard in the destination bucket are immediately readable. In contrast, S3 Glacier classes require a retrieval process.
The RTO is 1515 minutes, meaning data must be ready for immediate read operations. Glacier Standard retrieval takes 33 to 55 hours, which violates the RTO.

Key Concept

High availability and disaster recovery for object storage using Amazon S3 Cross-Region Replication (CRR) and S3 Replication Time Control (S3 RTC) to meet tight RPO/RTO SLAs.
Estimated Time:2m 0s
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Topics

Resilient and Highly Available Storage Infrastructure

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