AWS Certified Solutions Architect - Associate
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A company stores a large volume of image files in an Amazon S3 bucket. The images need to be readily available for the first 180 days. The images are infrequently accessed for the next 180 days. After 360 days, the images need to be archived but must be available instantly upon request. After 5 years, only auditors can access the images. The auditors must be able to retrieve the images within 12 hours. The images cannot be lost during this process.
A developer will use S3 Standard storage for the first 180 days. The developer needs to configure an S3 Lifecycle rule.
Which solution will meet these requirements MOST cost-effectively?
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UAnonymous
A
Transition the objects to S3 One Zone-Infrequent Access (S3 One Zone-IA) after 180 days. S3 Glacier Instant Retrieval after 360 days, and S3 Glacier Deep Archive after 5 years.
B
Transition the objects to S3 One Zone-Infrequent Access (S3 One Zone-IA) after 180 days. S3 Glacier Flexible Retrieval after 360 days, and S3 Glacier Deep Archive after 5 years.
C
Transition the objects to S3 Standard-Infrequent Access (S3 Standard-IA) after 180 days, S3 Glacier Instant Retrieval after 360 days, and S3 Glacier Deep Archive after 5 years.
D
Transition the objects to S3 Standard-Infrequent Access (S3 Standard-IA) after 180 days, S3 Glacier Flexible Retrieval after 360 days, and S3 Glacier Deep Archive after 5 years.
Explanation:
Detailed Explanation
Let's analyze the requirements step by step:
Requirements Breakdown:
- First 180 days: Images need to be readily available → S3 Standard (already specified)
- Next 180 days (days 181-360): Infrequently accessed → Need S3 Standard-IA or S3 One Zone-IA
- After 360 days: Archived but must be available instantly upon request → Need instant retrieval capability
- After 5 years: Only auditors access, within 12 hours retrieval time
- Images cannot be lost → Requires durability considerations
Storage Class Analysis:
For days 181-360 (infrequent access):
- S3 Standard-IA: Higher durability (99.999999999% across multiple AZs), slightly higher cost than One Zone-IA
- S3 One Zone-IA: Lower durability (99.999999999% in single AZ), lower cost
- Since requirement states "images cannot be lost during this process", S3 Standard-IA is safer
For days 361-5 years (instant retrieval required):
- S3 Glacier Instant Retrieval: Provides millisecond retrieval times, suitable for "available instantly upon request"
- S3 Glacier Flexible Retrieval: Has retrieval times ranging from minutes to hours (Expedited: 1-5 minutes, Standard: 3-5 hours, Bulk: 5-12 hours) → NOT instant
After 5 years (12-hour retrieval acceptable):
- S3 Glacier Deep Archive: Lowest cost, retrieval within 12 hours (Standard: 12 hours, Bulk: 48 hours)
Why Option C is Correct:
- S3 Standard-IA (not One Zone-IA) for days 181-360 ensures durability while being cost-effective for infrequent access
- S3 Glacier Instant Retrieval for days 361-5 years meets the "available instantly upon request" requirement
- S3 Glacier Deep Archive after 5 years meets the 12-hour retrieval requirement at lowest cost
Why Other Options are Incorrect:
- Option A: Uses One Zone-IA which has lower durability (single AZ), risking data loss
- Option B: Uses One Zone-IA (durability risk) AND Glacier Flexible Retrieval (not instant retrieval)
- Option D: Uses Glacier Flexible Retrieval which doesn't provide instant retrieval (3-5 hours minimum)
Cost-Effectiveness Analysis:
While S3 One Zone-IA is cheaper than S3 Standard-IA, the requirement "images cannot be lost" makes Standard-IA the better choice for durability. The combination of Standard-IA → Glacier Instant Retrieval → Glacier Deep Archive provides the optimal balance of durability, performance requirements, and cost.
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