A meteorological research center stores two types of data in a single Amazon S3 bucket: * … — AWS Certified Solutions Architect - Associate

A meteorological research center stores two types of data in a single Amazon S3 bucket:

* Satellite Images: Average file size is $15\text{ MB}$ . These files are accessed frequently for the first $14\text{ days}$ , after which they are rarely retrieved but must be retained for $1\text{ year}$ for climate modeling.
* Station Telemetry Logs: Average file size is $5\text{ KB}$ . These logs are analyzed immediately upon upload, may be re-processed up to $10\text{ days}$ after ingestion, and are no longer needed afterward.

Which TWO lifecycle configuration actions will result in the most cost-effective storage solution for this data?

Transition the Satellite Images to S3 Standard-Infrequent Access (S3 Standard-IA) $14\text{ days}$ after upload.Answer
Configure an expiration rule to permanently delete the Station Telemetry Logs $10\text{ days}$ after upload without transitioning them to another storage class.Answer
C
Transition the Station Telemetry Logs to S3 Standard-Infrequent Access (S3 Standard-IA) immediately upon upload, then expire them after $10\text{ days}$ .
D
Transition the Station Telemetry Logs to S3 One Zone-Infrequent Access (S3 One Zone-IA) $5\text{ days}$ after upload, then expire them after $10\text{ days}$ .
E
Transition the Station Telemetry Logs to S3 Standard-Infrequent Access (S3 Standard-IA) $10\text{ days}$ after upload, then expire them after $15\text{ days}$ .

Answer

The correct answer is to transition the Satellite Images to S3 Standard-IA 14 days after upload and permanently delete the Station Telemetry Logs 10 days after upload without transitioning them.

Transitioning the Satellite Images to S3 Standard-IA after 14 days is correct because the average file size (15 MB) exceeds the 128 KB minimum size threshold, and the remaining 351 days of retention exceed the 30-day minimum storage duration of S3 Standard-IA. Deleting the Station Telemetry Logs after 10 days without transitioning them is correct because their average size (5 KB) is well below the 128 KB minimum billing size for S3 Standard-IA, and their 10-day retention is below the 30-day minimum storage duration. Thus, keeping them in S3 Standard and deleting them directly avoids both size and duration penalties.

Step-by-Step Solution

Analyze the file sizes and access patterns of both datasets to determine eligibility for Infrequent Access tiers.

The Satellite Images average 15 MB (well above the 128 KB minimum billing size for S3 Standard-IA), while the Station Telemetry Logs average 5 KB (far below the 128 KB minimum billing size).

S3 Standard-IA has a minimum billing size of 128 KB per object; smaller objects are billed as 128 KB, which makes transitioning them highly cost-inefficient.

Evaluate the retention periods and lifecycle durations against the minimum storage duration requirements of S3 Standard-IA and S3 One Zone-IA.

The Satellite Images need to be kept for 365 days (transitioned after 14 days, leaving 351 days in S3 Standard-IA, which is well above the 30-day minimum). The Station Telemetry Logs are only kept for 10 days total (which is below the 30-day minimum storage duration of S3 Standard-IA and S3 One Zone-IA).

S3 Standard-IA and S3 One Zone-IA charge a minimum of 30 days of storage. Transitioning objects that will be deleted in fewer than 30 days results in a prorated penalty charge for the remaining days.

Select the optimal lifecycle actions based on the analysis.

Transition the Satellite Images to S3 Standard-IA after 14 days, and directly expire the Station Telemetry Logs from S3 Standard after 10 days.

This configuration maximizes cost savings for the large files while avoiding size and duration penalties for the small, short-lived files.

Key Concept

Selecting S3 storage classes based on object size thresholds and minimum storage duration constraints.

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Answer

Step-by-Step Solution

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