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Difficulty: EasyBlob, File, and Disk Storage Solutions

You are designing an Azure Blob Storage solution for storing virtual machine backups. The solution must meet the following requirements:
- Ensure the backups remain available if a single datacenter in the primary region fails.
- Ensure backups can be retrieved within seconds if a restore is initiated.
- Minimize storage costs.

Which storage configuration should you recommend?

  1. A
    Locally-redundant storage (LRS) in the Cool access tier
  2. B
    Zone-redundant storage (ZRS) in the Archive access tier
  3. Zone-redundant storage (ZRS) in the Cool access tierAnswer
  4. D
    Read-access geo-redundant storage (RA-GRS) in the Cool access tier

Answer

Zone-redundant storage (ZRS) in the Cool access tier
Zone-redundant storage (ZRS) replicates data synchronously across three Azure availability zones in the primary region, meeting the requirement to survive a single datacenter (zone) failure. The Cool access tier is cost-effective for storage that is not accessed frequently but requires immediate retrieval times, which matches the backup restoration requirements.

Step-by-Step Solution

1
Identify the resiliency requirement.
The solution must survive a single datacenter failure in the primary region.
Locally-redundant storage (LRS) is insufficient because it only replicates within a single datacenter. Zone-redundant storage (ZRS) or geo-redundant options are required.
2
Analyze retrieval time requirements.
The backups must be retrieved within seconds (sub-second retrieval).
This rules out the Archive access tier, which requires hours for data rehydration. The Hot or Cool tiers are appropriate.
3
Compare cost and redundancy options.
Zone-redundant storage (ZRS) in the Cool tier is selected.
ZRS meets the datacenter resilience requirement at a lower cost than geo-redundant options like RA-GRS, and the Cool tier provides immediate retrieval at a lower storage cost than the Hot tier.

Key Concept

Azure Storage Redundancy and Access Tiers
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Topics

Blob, File, and Disk Storage Solutions

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