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Difficulty: MediumData Lifecycle Management and Retention

A media broadcasting company stores high-resolution raw video footage in a General-purpose v2 (GPv2) Azure Blob storage account. The data access patterns and requirements are as follows:

* Newly uploaded footage is frequently accessed and edited for the first 30 days.
* Between 30 and 90 days, the footage is rarely accessed but must be available for immediate playback (sub-second retrieval latency) if requested by editors.
* After 90 days, the footage is preserved for long-term compliance for a total of 365 days from the upload date. For compliance audits, retrieval latency of up to 15 hours is acceptable.
* After 365 days, the footage must be permanently deleted.

Which of the following lifecycle management configurations meets the requirements while minimizing storage costs?

  1. Transition blobs to cool storage after 30 days, transition blobs to archive storage after 90 days, and delete blobs after 365 days.Answer
  2. B
    Transition blobs to archive storage after 30 days, and delete blobs after 365 days.
  3. C
    Transition blobs to cool storage after 30 days, transition blobs to archive storage after 120 days, and delete blobs after 485 days.
  4. D
    Transition blobs to archive storage after 30 days, transition blobs to cool storage after 90 days, and delete blobs after 365 days.

Answer

Transition blobs to cool storage after 30 days, transition blobs to archive storage after 90 days, and delete blobs after 365 days.
The correct configuration utilizes the absolute time elapsed since blob creation to trigger the lifecycle actions. Moving the blobs to the Cool tier after 30 days maintains sub-second retrieval latency for immediate playback. Transitioning the blobs to the Archive tier after 90 days matches the latency tolerance of up to 15 hours for compliance. Deleting the blobs after 365 days fulfills the retention policy requirement.

Step-by-Step Solution

1
Analyze the access and latency requirements for the first 90 days.
Frequent access for 30 days requires the Hot tier. Between 30 and 90 days, the footage must support sub-second retrieval latency, meaning it must stay in the Cool tier (Archive cannot be used here).
Ensures immediate playback remains possible while lowering costs after the initial 30 days.
2
Analyze the requirements after 90 days and calculate the Archive transition point.
After 90 days, a 15-hour retrieval delay is acceptable, allowing a transition to the Archive tier. Since lifecycle policy rules evaluate days relative to the creation date, the Archive transition is set to 90 days.
Minimizes storage costs for the compliance retention period.
3
Determine the deletion policy day parameter.
The total retention period is 365 days from the upload date. The deletion action is configured for 365 days since creation.
Satisfies the compliance deletion mandate without keeping data longer than necessary.

Key Concept

Azure Blob Storage lifecycle management policy rules evaluate time elapsed since blob creation as an absolute value rather than a cumulative sequence. Transitions must follow a unidirectional flow from warmer to cooler tiers (Hot to Cool to Archive), and the Archive tier is not suitable for workloads requiring sub-second or immediate access.
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Topics

Data Lifecycle Management and Retention

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