A genomics research company stores two types of data in an Amazon S3 bucket:

- Raw DNA sequence data: The files average $350\text{ MB}$ in size. They are accessed frequently during the first $10\text{ days}$ after upload. Afterward, they are rarely accessed, but must be retained for a total of $25\text{ days}$ from the upload date before they can be safely deleted.
- Variant call metadata: The files average $30\text{ KB}$ in size. They are accessed frequently for the first $15\text{ days}$ after upload. Afterward, they are rarely accessed, but must be retained for a total of $90\text{ days}$ from the upload date before they can be safely deleted.

Which Amazon S3 lifecycle configuration is the most cost-effective for managing these datasets?

A
Transition the raw DNA sequence data to S3 Standard-IA after $10\text{ days}$ and delete them after $25\text{ days}$ ; transition the variant call metadata to S3 Standard-IA after $15\text{ days}$ and delete them after $90\text{ days}$ .
B
Transition the raw DNA sequence data to S3 Standard-IA after $10\text{ days}$ and delete them after $25\text{ days}$ ; keep the variant call metadata in S3 Standard and delete them after $90\text{ days}$ .
Keep both the raw DNA sequence data and the variant call metadata in S3 Standard for their entire lifetimes, and delete the raw data after $25\text{ days}$ and the metadata after $90\text{ days}$ .Cevap
D
Keep the raw DNA sequence data in S3 Standard and delete them after $25\text{ days}$ ; transition the variant call metadata to S3 Standard-IA after $15\text{ days}$ and delete them after $90\text{ days}$ .

Cevap

Keep both the raw DNA sequence data and the variant call metadata in S3 Standard for their entire lifetimes, and delete the raw data after

25\text{ days}

and the metadata after

90\text{ days}

The correct answer is to keep both the raw DNA sequence data and the variant call metadata in S3 Standard for their entire lifetimes. The raw DNA sequence data has a total lifecycle of 25 days. Transitioning it to S3 Standard-IA after 10 days would mean storing it in the IA tier for only 15 days, which violates the 30-day minimum storage duration of S3 Standard-IA and triggers a billing penalty. The variant call metadata files average 30 KB, which is well below the 128 KB minimum object capacity charge for S3 Standard-IA. Storing them in S3 Standard-IA would result in a significant capacity billing penalty.

Adım Adım Çözüm

Analyze the lifecycle constraints for the raw DNA sequence data.

The files are

350\text{ MB}

(above the

128\text{ KB}

S3 Standard-IA minimum object size limit) and have a total lifetime of

25\text{ days}

Determining file size and duration is necessary to identify potential S3 Standard-IA storage tiering options.

Evaluate S3 Standard-IA transition feasibility for the raw DNA sequence data.

If transitioned to S3 Standard-IA at Day 10, the files remain in S3 Standard-IA for only

15\text{ days}

(

25 - 10

) before deletion. Because S3 Standard-IA has a minimum storage duration of

30\text{ days}

, the company will be billed for a full

30\text{ days}

of Standard-IA storage, making this transition financially suboptimal compared to remaining in S3 Standard.

Applying the S3 Standard-IA minimum storage duration rules reveals the storage cost penalty.

Analyze the lifecycle constraints for the variant call metadata files.

The metadata files average

30\text{ KB}

in size and have a total lifetime of

90\text{ days}

Understanding the characteristics of the second dataset is necessary to determine the optimal lifecycle configuration.

Evaluate S3 Standard-IA transition feasibility for the variant call metadata.

S3 Standard-IA has a minimum capacity charge of

128\text{ KB}

per object. Storing

30\text{ KB}

files in S3 Standard-IA forces billing at

128\text{ KB}

per file (a

326\%

increase in billed capacity), which negates standard storage tier savings.

Applying S3 Standard-IA minimum object size rules demonstrates that transitioning these small objects is more expensive than leaving them in S3 Standard.

Anahtar Kavram

S3 Lifecycle Management Cost Constraints

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

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