A security and analytics company collects telemetry data and daily aggregated summaries fr… — AWS Certified Solutions Architect - Associate

A security and analytics company collects telemetry data and daily aggregated summaries from IoT sensors.

The data characteristics are as follows:

* Telemetry Reports: Average file size of $80\text{ KB}$ , with $10\text{ million}$ new files generated daily. The files are frequently analyzed for $10\text{ days}$ , after which they are rarely accessed. They must be deleted after $90\text{ days}$ .
* Aggregated Summaries: Average file size of $5\text{ MB}$ , with $10,000\text{ new files}$ generated daily. They are frequently accessed for $45\text{ days}$ . Between day $46$ and day $90$ , they are accessed occasionally (one or two times per month). After day $90$ , they are rarely accessed but must be retained indefinitely for long-term audit purposes, with a recovery time of up to $12\text{ hours}$ acceptable.

Which two S3 Lifecycle configurations will provide the most cost-effective solution for this data? (Select TWO.)

For the Telemetry Reports, create a lifecycle rule to expire the objects after 90 days without transitioning them to any other storage class.Answer
B
For the Telemetry Reports, create a lifecycle rule to transition the objects to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) after 10 days, and expire them after 90 days.
For the Aggregated Summaries, create a lifecycle rule to transition the objects to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) after 45 days, and to Amazon S3 Glacier Deep Archive after 90 days.Answer
D
For the Aggregated Summaries, create a lifecycle rule to transition the objects to Amazon S3 Glacier Flexible Retrieval after 45 days, and then to Amazon S3 Glacier Deep Archive after 90 days.
E
For the Telemetry Reports, create a lifecycle rule to transition the objects to Amazon S3 Intelligent-Tiering after 10 days, and expire them after 90 days.

Answer

The most cost-effective approach is to retain the Telemetry Reports in S3 Standard for the entire 90 days without transitioning them, and then expire them, while transitioning the Aggregated Summaries to S3 Standard-IA at day 45 and then to S3 Glacier Deep Archive at day 90.

For the Telemetry Reports, keeping the objects in S3 Standard for their entire 90-day lifetime is the most cost-effective option because the

100 transition fee for 10 million objects significantly exceeds the

55.20 total storage cost in S3 Standard, and their 80 KB size would trigger a 128 KB billing minimum in S3 Standard-IA. For the Aggregated Summaries, transitioning to S3 Standard-IA after 45 days and then to S3 Glacier Deep Archive after 90 days is ideal because the summaries are large (5 MB) and low-volume (10,000 files daily), making transition costs negligible. It also satisfies the 30-day minimum storage duration for S3 Standard-IA before transitioning to Deep Archive, which allows up to 12-hour retrieval times.

Step-by-Step Solution

Analyze the size and count of the Telemetry Reports to evaluate S3 Standard-IA suitability.

Transitioning 10 million objects to S3 Standard-IA costs 100 USD in transition fees. Because the reports are 80 KB, they are under the 128 KB minimum billable size, incurring a storage penalty. The storage of 800 GB in S3 Standard for the full 90 days costs only 55.20 USD. Thus, transitioning is mathematically counterproductive.

To determine whether transitioning small objects is cost-effective by comparing transition costs and storage overhead against potential savings.

Analyze S3 Intelligent-Tiering behavior for Telemetry Reports.

Objects under 128 KB are not auto-tiered in S3 Intelligent-Tiering and are billed at S3 Standard rates. Transitioning them incurs lifecycle transition fees without providing any storage tiering benefits.

To rule out S3 Intelligent-Tiering for the small reports due to the 128 KB minimum monitoring limitation.

Evaluate S3 Standard-IA and S3 Glacier Deep Archive lifecycle paths for Aggregated Summaries.

The summaries are 5 MB (larger than 128 KB) and have a volume of only 10,000 files daily, resulting in low transition costs (0.10 USD to Standard-IA and 0.50 USD to Glacier Deep Archive). Moving them to S3 Standard-IA after 45 days aligns with the occasional access requirement and satisfies the 30-day S3 Standard-IA minimum storage duration rule before they transition to S3 Glacier Deep Archive at day 90.

To optimize storage for larger files with predictable, decreasing access patterns while satisfying minimum storage duration constraints.

Examine the S3 Glacier Flexible Retrieval minimum storage duration constraint.

Glacier Flexible Retrieval has a 90-day minimum storage duration. Transitioning to Glacier Flexible Retrieval at day 45 and then to Glacier Deep Archive at day 90 results in only 45 days in Glacier Flexible Retrieval, triggering early deletion/transition charges.

To avoid early transition fees on Glacier storage tiers.

Key Concept

S3 Lifecycle policies must account for object size thresholds, transition request fees, and minimum storage durations to avoid penalties and negative cost savings.

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Step-by-Step Solution

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