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Difficulty: EasyCost-Optimized Storage Tiering and Lifecycle Management

A logistics company generates daily shipment tracking archives averaging 8 MB8\text{ MB} in size. These archives are stored in Amazon S3 Standard and are frequently accessed for the first 1515 days to verify delivery status. After 1515 days, the archives are rarely accessed and are permanently deleted after a total of 2828 days. Which lifecycle strategy is the most cost-effective for these archives?

  1. A
    Configure a lifecycle rule to transition the archives to S3 Standard-Infrequent Access (S3 Standard-IA) after 1515 days, and expire them after 2828 days.
  2. Keep the archives in S3 Standard, and configure a lifecycle rule to expire the objects after 2828 days.Answer
  3. C
    Configure a lifecycle rule to transition the archives to S3 One Zone-Infrequent Access (S3 One Zone-IA) after 1515 days, and expire them after 2828 days.
  4. D
    Configure a lifecycle rule to transition the archives to Amazon S3 Glacier Flexible Retrieval after 1515 days, and expire them after 2828 days.

Answer

Keep the archives in S3 Standard, and configure a lifecycle rule to expire the objects after 2828 days.
The correct strategy is to keep the archives in S3 Standard and delete them after 2828 days. This is because transitioning the objects to S3 Standard-IA, S3 One Zone-IA, or S3 Glacier Flexible Retrieval after 1515 days means the objects will spend only 1313 days in those tiers before deletion. S3 Standard-IA and One Zone-IA have a 3030-day minimum storage duration charge, while S3 Glacier Flexible Retrieval has a 9090-day minimum storage duration charge. Deleting the objects early incurs a minimum storage duration charge penalty, making the transitions more expensive than keeping them in S3 Standard.

Step-by-Step Solution

1
Calculate the duration that objects would spend in the infrequent access tier.
The objects are transitioned after 1515 days and deleted after 2828 days. The duration in the transitioned tier is 28−15=1328 - 15 = 13 days.
To evaluate if transitioning is cost-effective, we must check if the storage duration in the target tier meets its minimum storage duration constraint.
2
Compare the calculated duration against the minimum storage duration requirements for S3 Standard-IA, S3 One Zone-IA, and S3 Glacier.
S3 Standard-IA and S3 One Zone-IA both require a minimum of 3030 days. S3 Glacier Flexible Retrieval requires a minimum of 9090 days. The calculated duration (1313 days) is less than the minimum duration for all these tiers.
Amazon S3 charges a prorated deletion penalty for objects deleted before the minimum duration threshold of the tier.
3
Identify the most cost-effective strategy given the constraints.
Since transitioning to any cheaper tier incurs a minimum storage duration penalty, keeping the objects in S3 Standard for the entire 2828 days and expiring them directly is the most cost-effective solution.
Avoiding the minimum storage duration penalty and transition fees makes S3 Standard the cheaper option overall.

Key Concept

S3 Lifecycle Minimum Storage Durations and Early Deletion Fees
Estimated Time:50s
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Topics

Cost-Optimized Storage Tiering and Lifecycle Management