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Difficulty: EasyCost-Optimized Storage Tiering and Lifecycle Management

A travel booking system generates daily XML reconciliation reports. The files average 15 MB15\text{ MB} in size and are stored in an Amazon S3 bucket. These reports are accessed frequently during the first 1414 days for booking validation. After 1414 days, they are rarely accessed, but must be retained for auditing purposes for a total of 2525 days from creation. After 2525 days, the files are no longer needed and can be permanently deleted. Which of the following Amazon S3 lifecycle configurations provides the most cost-effective storage solution?

  1. Keep the reports in the Amazon S3 Standard tier, and configure a lifecycle rule to permanently delete the files after 2525 days.Answer
  2. B
    Configure a lifecycle rule to transition the reports to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) after 1414 days, and permanently delete the files after 2525 days.
  3. C
    Configure a lifecycle rule to transition the reports to Amazon S3 Glacier Flexible Retrieval after 1414 days, and permanently delete the files after 2525 days.
  4. D
    Configure a lifecycle rule to transition the reports to Amazon S3 Intelligent-Tiering after 1414 days, and permanently delete the files after 2525 days.

Answer

Keep the reports in the Amazon S3 Standard tier, and configure a lifecycle rule to permanently delete the files after 2525 days.
Keeping the reports in Amazon S3 Standard and deleting them after 2525 days is the most cost-effective option. Because the total lifecycle of the files is only 2525 days, transitioning them to S3 Standard-IA or S3 Glacier Flexible Retrieval after 1414 days would result in early deletion charges (due to their 3030-day and 9090-day minimum storage duration requirements, respectively). Thus, the cost of keeping them in S3 Standard for 2525 days is lower than transitioning them to a tier with minimum storage duration penalties.

Step-by-Step Solution

1
Analyze the file lifecycle duration and access patterns.
The files have a total lifespan of 2525 days, with frequent access for the first 1414 days and rare access for the remaining 1111 days.
Understanding the timeline is necessary to evaluate minimum storage duration constraints for different S3 storage classes.
2
Evaluate S3 Standard-IA storage constraints.
S3 Standard-IA requires a minimum storage duration of 3030 days. Transitioning at day 1414 and deleting at day 2525 keeps files in S3 Standard-IA for only 1111 days, triggering a 1919-day early deletion charge.
Calculating early deletion charges helps determine if transitioning to a lower-cost tier is actually cheaper than keeping the files in S3 Standard.
3
Compare costs between S3 Standard and S3 Standard-IA with early deletion penalty.
Keeping the files in S3 Standard for 2525 days is more cost-effective than paying for 1414 days of S3 Standard plus 3030 days of S3 Standard-IA (along with transition request fees).
Selecting the option with the lowest total cost satisfies the requirement for a cost-optimized storage architecture.

Key Concept

Amazon S3 Standard-IA has a 3030-day minimum storage duration charge. If objects are deleted or transitioned before 3030 days have elapsed in this tier, an early deletion charge is applied.
Estimated Time:1m 15s
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Topics

Cost-Optimized Storage Tiering and Lifecycle Management