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Difficulty: HardPlanning Cloud Storage Buckets and Storage Classes

A healthcare analytics firm ingests large volumes of patient diagnostic images into a Google Cloud Storage bucket. The access pattern is defined as follows:
- During the first 30 days after ingestion, images are accessed frequently by machine learning pipelines for daily analysis.
- Between 31 days and 365 days, images are accessed infrequently (less than once per quarter) for occasional patient follow-ups, but sub-second retrieval performance is still required.
- After 365 days, images must be retained for 7 years to meet regulatory compliance, with an expected access frequency of less than once per year.

Which TWO Object Lifecycle Management rules should you configure on the bucket to minimize total cost of ownership while adhering to minimum storage duration requirements?

  1. Transition objects to Coldline Storage when their age reaches 30 days.Answer
  2. Transition objects to Archive Storage when their age reaches 365 days.Answer
  3. C
    Transition objects to Nearline Storage immediately upon object creation.
  4. D
    Set the default storage class of the bucket to Archive Storage upon creation and transition objects to Standard Storage at 30 days.

Answer

The correct lifecycle actions are to transition objects to Coldline Storage at 30 days of age, and transition objects to Archive Storage at 365 days of age.
Transitioning objects to Coldline Storage at day 30 aligns with the requirement for access less than once per quarter, utilizing a tier with a 90-day minimum storage duration. Transitioning to Archive Storage at day 365 matches the compliance pattern of less than once per year access, utilizing the lowest-cost tier with a 365-day minimum duration.

Step-by-Step Solution

1
Analyze initial 30-day access pattern and storage class requirements.
Heavy access during the first 30 days requires keeping objects in Standard Storage to avoid retrieval fees.
Standard Storage has no minimum retention duration and no retrieval charges for active reading.
2
Evaluate storage class selection for the 31-day to 365-day window.
Coldline Storage is selected for transition at 30 days.
Access frequency is less than once a quarter. Coldline Storage provides low-cost storage with a 90-day minimum duration, which easily fits within the 335-day window before the 1-year mark.
3
Evaluate long-term retention requirements beyond 365 days.
Archive Storage is selected for transition at 365 days.
Regulatory compliance requires 7-year storage with access expected less than once a year. Archive Storage provides the lowest storage cost per gigabyte with a 365-day minimum duration requirement.

Key Concept

Google Cloud Storage Class Selection and Object Lifecycle Management
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Topics

Planning Cloud Storage Buckets and Storage Classes

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