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Difficulty: MediumAmazon S3 Storage Class and Lifecycle Optimization

A company stores application logs in an Amazon S3 Standard bucket. The logs are accessed frequently during the first 30 days. From day 31 to day 90, the logs are accessed infrequently but must be available with millisecond retrieval latency. After 90 days, the logs are rarely accessed but must be retained for another 180 days for compliance audits. The compliance audits can tolerate a retrieval time of up to 5 hours. Which configuration of Amazon S3 Lifecycle rules meets these requirements in the most cost-effective manner?

  1. Transition the objects to S3 Standard-Infrequent Access (S3 Standard-IA) after 30 days, and transition them to Amazon S3 Glacier Flexible Retrieval after 90 days.Answer
  2. B
    Transition the objects to S3 Intelligent-Tiering after 30 days, and transition them to S3 Standard-Infrequent Access (S3 Standard-IA) after 90 days.
  3. C
    Transition the objects to S3 Standard-Infrequent Access (S3 Standard-IA) after 30 days, and transition them to Amazon S3 Glacier Deep Archive after 90 days.
  4. D
    Transition the objects to S3 Standard-Infrequent Access (S3 Standard-IA) after 15 days, and transition them to Amazon S3 Glacier Flexible Retrieval after 90 days.

Answer

Transition the objects to S3 Standard-Infrequent Access (S3 Standard-IA) after 30 days, and transition them to Amazon S3 Glacier Flexible Retrieval after 90 days.
The correct configuration transitions objects to S3 Standard-IA after 30 days and to S3 Glacier Flexible Retrieval after 90 days. This matches the access pattern requirements because S3 Standard-IA offers millisecond retrieval latency for the infrequent access phase, and S3 Glacier Flexible Retrieval supports standard retrievals within 3–5 hours, which satisfies the 5-hour compliance retrieval SLA at a highly optimized cost point.

Step-by-Step Solution

1
Analyze the access and performance requirements for each phase of the lifecycle.
Phase 1 (Days 1–30): Frequent access, millisecond retrieval. Phase 2 (Days 31–90): Infrequent access, millisecond retrieval. Phase 3 (Days 91–270): Rare access, retrieval tolerance up to 5 hours.
This establishes the baseline requirements that any compliant S3 storage class configuration must satisfy.
2
Select the appropriate storage class for each phase.
Phase 1 requires S3 Standard. Phase 2 requires S3 Standard-IA because it provides millisecond retrieval latency. Phase 3 requires Amazon S3 Glacier Flexible Retrieval, as its standard retrieval time is 3–5 hours, meeting the 5-hour audit SLA at a lower cost than Glacier Instant Retrieval.
Choosing the correct storage classes ensures all performance, retrieval latency, and compliance SLAs are satisfied.
3
Validate the S3 Lifecycle transition rules and timelines for the selected classes.
Transitioning from S3 Standard to S3 Standard-IA after 30 days is valid. Transitioning from S3 Standard-IA to S3 Glacier Flexible Retrieval after 90 days (60 days spent in Standard-IA) is valid and avoids any early deletion or transition minimum storage duration fees since the object stayed in S3 Standard-IA for more than the 30-day minimum.
Validating rules prevents configuration errors and unexpected charges due to S3 minimum storage duration policies.

Key Concept

Amazon S3 Storage Class and Lifecycle Transition Rules
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Topics

Amazon S3 Storage Class and Lifecycle Optimization

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