A genomics research laboratory generates two types of data: raw genomic sequence files wit… — AWS Certified Solutions Architect - Associate

A genomics research laboratory generates two types of data: raw genomic sequence files with an average size of $150\text{ MB}$ and summary analysis reports with an average size of $10\text{ KB}$ .

- The raw sequence files are accessed frequently during the first $20\text{ days}$ for data pipelines. After this initial period, they are rarely accessed but must be retained for $5\text{ years}$ for audit purposes, with a retrieval time of up to $12\text{ hours}$ being acceptable.
- The summary analysis reports are accessed frequently for the first $10\text{ days}$ , but are only needed for a total of $25\text{ days}$ , after which they can be permanently deleted.

Which two lifecycle actions should a solutions architect configure to meet these requirements in the most cost-effective manner? (Select TWO.)

Configure a lifecycle policy to transition the raw genomic sequence files from S3 Standard to Amazon S3 Glacier Flexible Retrieval after $20\text{ days}$ .Cevap
Configure a lifecycle policy to delete the summary analysis reports directly from S3 Standard after $25\text{ days}$ .Cevap
C
Configure a lifecycle policy to transition the raw genomic sequence files from S3 Standard to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) after $10\text{ days}$ , and then to Amazon S3 Glacier Flexible Retrieval after $20\text{ days}$ .
D
Configure a lifecycle policy to transition the summary analysis reports from S3 Standard to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) after $10\text{ days}$ , and delete them after $25\text{ days}$ .
E
Configure a lifecycle policy to transition the summary analysis reports from S3 Standard to Amazon S3 Glacier Flexible Retrieval after $10\text{ days}$ .

Cevap

The correct lifecycle actions are to transition the raw genomic sequence files to S3 Glacier Flexible Retrieval after

20\text{ days}

and to delete the summary reports directly from S3 Standard after

25\text{ days}

Transitioning the large raw genomic files (

150\text{ MB}

) directly to Amazon S3 Glacier Flexible Retrieval after

20\text{ days}

is highly cost-effective because the files are large enough to avoid size penalties, they are rarely accessed after

20\text{ days}

, and the required recovery time window (

12\text{ hours}

) is compatible with Glacier's standard retrieval performance (

3\text{ to }5\text{ hours}

). Deleting the summary reports directly from S3 Standard after

25\text{ days}

is correct because their size (

10\text{ KB}

) falls well below the

128\text{ KB}

minimum storage size for S3 Standard-IA, and their residency in the IA tier would be only

15\text{ days}

, which violates the

30\text{-day}

minimum storage duration. Thus, keeping them in S3 Standard avoids both the minimum capacity charge and early deletion fees.

Adım Adım Çözüm

Evaluate the storage needs for raw genomic sequence files.

The files are

150\text{ MB}

(above the

128\text{ KB}

threshold), require active access for

20\text{ days}

, and can tolerate retrieval times of up to

12\text{ hours}

for the remaining

5\text{ years}

. Amazon S3 Glacier Flexible Retrieval meets this retrieval profile with standard retrievals (

3\text{ to }5\text{ hours}

) at a lower cost than S3 Standard.

To select the most cost-effective storage tier that matches access frequency and retrieval time limits.

Evaluate the storage needs for summary analysis reports.

The reports are small (

10\text{ KB}

) and are only needed for a total of

25\text{ days}

. Transitioning them to S3 Standard-IA or One Zone-IA after

10\text{ days}

would leave them in the IA tier for only

15\text{ days}

before deletion, violating the

30\text{-day}

minimum storage duration. Also, their

10\text{ KB}

size is billed at a

128\text{ KB}

minimum, creating a

12.8\text{x}

cost overhead.

To determine whether transitioning short-lived, small objects to infrequent access tiers is cost-effective.

Synthesize the lifecycle rules.

Transition the large files directly to S3 Glacier Flexible Retrieval after

20\text{ days}

. Leave the small reports in S3 Standard and delete them after

25\text{ days}

to avoid all minimum storage size and duration penalties.

To formulate the final most cost-optimized storage design.

Anahtar Kavram

Understanding S3 lifecycle transitions, object size constraints, and minimum storage durations to optimize costs.

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