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Difficulty: MediumPlanning Cloud Storage Buckets and Storage Classes

A biomedical research organisation ingests high-throughput genomic sequencing data into a Google Cloud Storage bucket. The raw data files are actively analyzed and queried daily for the first 30 days. After 30 days, access decreases significantly to occasional quarterly research reviews for the next 5 months. After 180 days from creation, the data is rarely accessed but must be retained for at least 7 years to satisfy compliance requirements. You need to design an automated cost-optimized storage strategy that maintains data availability while minimizing total cost of ownership. Which TWO management strategies should you combine? (Select TWO.)

  1. Define an Object Lifecycle Management rule with an action to transition objects to Nearline Storage when their age reaches 30 days.Answer
  2. Define an Object Lifecycle Management rule with an action to transition objects to Archive Storage when their age reaches 180 days.Answer
  3. C
    Set the default storage class of the bucket to Coldline Storage at creation time to reduce initial ingestion costs.
  4. D
    Configure an Object Lifecycle Management rule to transition objects to Archive Storage based on the 'DaysSinceLastAccess' condition equal to 30.

Answer

The correct strategy combines transitioning objects to Nearline Storage after 30 days and transitioning objects to Archive Storage after 180 days using Object Lifecycle Management rules.
For data accessed daily during the first month, Standard storage avoids retrieval fees. After 30 days, transitioning to Nearline storage provides lower storage costs for occasional quarterly access. After 180 days, transitioning to Archive storage minimizes long-term holding costs for regulatory compliance over 7 years.

Step-by-Step Solution

1
Analyze access patterns and minimum storage duration requirements for each stage of the data lifecycle.
Days 0–30 requires frequent access (Standard class). Days 31–180 requires monthly/quarterly access (Nearline class, 30-day minimum). Day 181+ requires rare access for multi-year compliance (Archive class, 365-day minimum).
Matching access frequency and duration to the appropriate Cloud Storage class minimizes combined storage and retrieval costs.
2
Identify the proper Object Lifecycle Management rule conditions.
Use the 'Age' condition (measured in days since object creation) to trigger transitions at 30 days and 180 days.
Cloud Storage lifecycle rules support age-based rules to seamlessly automate transitions between Standard, Nearline, Coldline, and Archive storage tiers.

Key Concept

Cloud Storage Class Selection and Object Lifecycle Management
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Topics

Planning Cloud Storage Buckets and Storage Classes

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