A research institute hosts genomic sequencing workloads on AWS. The workloads generate two… — AWS Certified Solutions Architect - Associate

A research institute hosts genomic sequencing workloads on AWS. The workloads generate two distinct datasets stored in a single Amazon S3 bucket:

* Raw sequencer outputs: Approximately $50,000$ files per month, with an average file size of $150\text{ MB}$ . These files are accessed frequently during the first $25$ days for analysis, after which they are rarely accessed but must be retained for $3$ years for regulatory compliance.
* Alignment index files: Approximately $20\text{ million}$ files per month, with an average file size of $5\text{ KB}$ . These files are accessed occasionally throughout the year to locate specific sequences, but they can be quickly regenerated from the raw outputs if needed, and must be kept for $1$ year.

Which combination of actions will provide the most cost-effective storage strategy for this data? (Select TWO.)

Configure an S3 Lifecycle policy to transition the raw sequencer outputs to S3 Standard-IA after $30$ days, and to S3 Glacier Deep Archive after $90$ days.Cevap
Retain the alignment index files in S3 Standard and configure an S3 Lifecycle policy to delete them after $1$ year.Cevap
C
Configure an S3 Lifecycle policy to transition the alignment index files to S3 Standard-IA after $30$ days to lower storage costs.
D
Configure an S3 Lifecycle policy to transition the alignment index files to S3 Glacier Flexible Retrieval after $90$ days.
E
Configure an S3 Lifecycle policy to transition the raw sequencer outputs to S3 Standard-IA after $10$ days, and then to S3 Glacier Deep Archive after $25$ days.

Cevap

The correct combination of actions is to transition the raw sequencer outputs to S3 Standard-IA after

30

days and then to S3 Glacier Deep Archive after

90

days, while keeping the alignment index files in S3 Standard and deleting them after

1

year.

Transitioning the large raw sequencer outputs to S3 Standard-IA after

30

days and then to S3 Glacier Deep Archive after

90

days avoids retrieval charges during their

25

-day active access window and respects the

30

-day minimum storage duration for S3 Standard-IA. For the alignment index files, keeping them in S3 Standard and deleting them after

1

year is most cost-effective because their small size (

5\text{ KB}

) makes transitioning them to S3 Standard-IA or S3 Glacier highly expensive due to the

128\text{ KB}

minimum billing size.

Adım Adım Çözüm

Analyze the size, access patterns, and retention requirements of the two datasets.

Raw sequencer outputs are large (

150\text{ MB}

), accessed for

25

days, and retained for

3

years. Alignment index files are small (

5\text{ KB}

), accessed occasionally for

1

year, and can be easily regenerated.

Understanding the unique profile of each dataset is necessary to determine which S3 storage classes and lifecycle rules are appropriate.

Evaluate the cost impact of transitioning the alignment index files to infrequent access or archival tiers.

Transitioning the

5\text{ KB}

alignment index files to S3 Standard-IA or S3 Glacier triggers the

128\text{ KB}

minimum billing size, magnifying the billed capacity by

25.6

times and raising costs. Therefore, they should remain in S3 Standard and be deleted after

1

year.

This avoids the minimum object size billing penalty inherent in S3 Standard-IA and S3 Glacier tiers.

Evaluate the cost impact of transition timelines for the raw sequencer outputs.

Transitioning raw sequencer outputs to S3 Standard-IA after

30

days avoids retrieval charges since active access ends at day

25

. Transitioning them to S3 Glacier Deep Archive after

90

days (spending

60

days in S3 Standard-IA) respects the

30

-day minimum storage duration of S3 Standard-IA.

This layout maximizes storage savings while avoiding early transition and active data retrieval penalties.

Anahtar Kavram

Selecting the most cost-effective S3 storage tier depends on object size and transition timing due to S3 Standard-IA/Glacier minimum billing sizes (

128\text{ KB}

) and minimum storage durations (

30

days for S3 Standard-IA).

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

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