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Difficulty: EasyResilient and Highly Available Storage Infrastructure

A financial auditing firm must store historical transaction logs. The logs require 99.999999999% durability and must be highly resilient across multiple Availability Zones. The recovery time objective (RTO) for retrieving these logs is less than 10 minutes when an audit request is received. The solution must be highly cost-effective. Which two AWS storage configurations will meet these requirements? (Select TWO).

  1. Store the logs in Amazon S3 Glacier Instant Retrieval to get millisecond retrieval times and multi-AZ durability.Answer
  2. Store the logs in Amazon S3 Standard-Infrequent Access (S3 Standard-IA) to ensure immediate retrieval and multi-AZ resilience.Answer
  3. C
    Store the logs in Amazon S3 Glacier Flexible Retrieval using standard retrievals to minimize storage costs.
  4. D
    Deploy a Pilot Light disaster recovery strategy using Amazon EBS volumes replicated to another Region, expecting near-zero recovery time.
  5. E
    Store the logs in an Amazon RDS database and configure a cross-Region Read Replica as the primary automated failover mechanism.

Answer

Storing the logs in Amazon S3 Glacier Instant Retrieval and storing the logs in Amazon S3 Standard-Infrequent Access (S3 Standard-IA).
Storing logs in S3 Glacier Instant Retrieval and S3 Standard-IA are the correct options because both storage classes provide 99.999999999% durability across multiple Availability Zones, support millisecond retrieval times (well within the 10-minute RTO), and represent cost-optimized tiers for infrequently accessed log files.

Step-by-Step Solution

1
Identify the durability and resilience requirements.
The logs require 99.999999999% durability and must be highly resilient across multiple Availability Zones. This rules out single-AZ storage classes like S3 One Zone-IA.
This establishes the baseline requirements for multi-AZ availability and durability.
2
Evaluate the recovery time objective (RTO).
The RTO is under 10 minutes, meaning standard or bulk retrieval options in Glacier (which take hours) are unacceptable.
This rules out Glacier Flexible Retrieval standard options which take hours, requiring millisecond or expedited access.
3
Compare the eligible S3 storage tiers and configurations.
S3 Glacier Instant Retrieval and S3 Standard-IA both meet the multi-AZ resilience, high durability, and millisecond retrieval requirements while offering lower storage costs compared to S3 Standard.
Selecting the two configurations that align with all metrics while remaining cost-optimized.

Key Concept

Selecting highly available, resilient, and cost-effective storage options that meet strict RTO constraints.
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Topics

Resilient and Highly Available Storage Infrastructure

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