Question

Difficulty: MediumData Lifecycle Management and Retention

An enterprise is designing a lifecycle management policy for audit logs stored in a General-purpose v2 (GPv2) Azure Blob Storage account. The logs must adhere to the following requirements:
- The logs must be frequently accessed and analyzed for the first 3030 days after creation.
- Between day 3131 and day 180180, the logs are rarely accessed but must remain available for immediate, sub-second retrieval to support unexpected security audits.
- After 180180 days, the logs are only retained for historical compliance, can tolerate retrieval latencies of up to 1515 hours, and must be stored at the lowest possible cost.
- The logs must be automatically deleted 365365 days after creation.

Which two actions should you include in the lifecycle management policy? (Choose two.)

  1. Transition blobs to the Cool tier 3030 days after last modificationAnswer
  2. Transition blobs to the Archive tier 180180 days after last modificationAnswer
  3. C
    Transition blobs to the Archive tier 3030 days after last modification
  4. D
    Transition blobs to the Archive tier 300300 days after last modification

Answer

The correct configuration transitions blobs to the Cool tier 3030 days after modification, and transitions blobs to the Archive tier 180180 days after modification.
The correct configuration transitions blobs to the Cool tier 3030 days after modification to save costs while maintaining sub-second retrieval times, and then transitions them to the Archive tier 180180 days after modification when high retrieval latency is acceptable. This ensures that the blobs spend 185185 days in the Archive tier before deletion at day 365365, satisfying the 180180-day minimum retention threshold and avoiding early deletion fees.

Step-by-Step Solution

1
Determine the optimal transition timing for the Cool tier based on latency requirements.
Transition to the Cool tier must occur 3030 days after modification because the data is rarely accessed starting on day 3131, but still requires sub-second retrieval times, which the Cool tier supports.
The Hot tier is too expensive for rarely accessed data, and the Archive tier does not support sub-second retrieval times.
2
Determine the optimal transition timing for the Archive tier based on latency and cost requirements.
Transition to the Archive tier must occur 180180 days after modification when the data no longer requires sub-second retrieval times.
The Archive tier offers the lowest storage cost and is acceptable since a retrieval latency of up to 1515 hours is tolerated after 180180 days.
3
Calculate the duration spent in the Archive tier to avoid early deletion charges.
If transitioned to Archive at day 180180 and deleted at day 365365, the blobs remain in the Archive tier for 185185 days (365180=185365 - 180 = 185).
This exceeds the Archive tier's 180180-day minimum retention requirement, avoiding any early deletion penalties.

Key Concept

Azure Storage lifecycle management allows automated tier transitions (Hot to Cool, Cool to Archive) and deletion based on blob modification or creation age. The design must balance access tier latency, storage costs, and minimum retention periods (such as 180180 days for the Archive tier) to avoid early deletion penalties.
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