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Difficulty: EasyMulti-AZ, Multi-Region Architectures and Disaster Recovery (DR)

A healthcare provider plans to store daily database backup archives in a secondary AWS Region to support their disaster recovery strategy. The database administrator suggests using Amazon S3 Glacier Flexible Retrieval with standard retrieval options, assuming that the archived data can be restored immediately during an unexpected primary site outage. Why is this assumption incorrect?

  1. Standard retrievals in Amazon S3 Glacier Flexible Retrieval typically take 3 to 5 hours to complete, which introduces significant recovery delays and prevents immediate data access.Answer
  2. B
    Amazon S3 Glacier Flexible Retrieval behaves as a pilot light environment, which requires a minimum of 24 hours to scale up compute instances before data blocks can be read.
  3. C
    Data in S3 Glacier cannot be retrieved unless there is an active Amazon RDS Multi-AZ replication configuration actively mirroring the database transaction logs to the secondary Region.
  4. D
    Retrieval requests from S3 Glacier fail unless an Amazon Route 53 latency routing policy is configured to route the archive request to the nearest edge location.

Answer

Standard retrievals in Amazon S3 Glacier Flexible Retrieval typically take 3 to 5 hours to complete, which introduces significant recovery delays and prevents immediate data access.
The correct option is correct because standard retrieval requests in Amazon S3 Glacier Flexible Retrieval typically take between 3 to 5 hours to complete. For disaster recovery scenarios that require rapid recovery, this time delay is unacceptable, meaning the assumption of immediate restoration is incorrect.

Step-by-Step Solution

1
Analyze the recovery requirements and the proposed AWS service.
The scenario asks why assuming immediate restore from Amazon S3 Glacier Flexible Retrieval with standard retrieval options is incorrect.
To evaluate the feasibility of the backup and restore solution, we must look at the retrieval latency of the selected storage class.
2
Evaluate the retrieval times of Amazon S3 Glacier Flexible Retrieval.
Amazon S3 Glacier Flexible Retrieval offers three retrieval options: Expedited (1-5 minutes), Standard (3-5 hours), and Bulk (5-12 hours).
Comparing these options reveals that the standard retrieval option does not allow for immediate restoration.
3
Identify the option that correctly states the limitation of the standard retrieval option.
The option stating that standard retrievals typically take 3 to 5 hours is correct.
This delay makes standard retrievals unsuitable for disaster recovery scenarios that require immediate, real-time data access.

Key Concept

Disaster Recovery Storage Retrieval Times
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Topics

Multi-AZ, Multi-Region Architectures and Disaster Recovery (DR)

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