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Difficulty: EasyData Redundancy and High Availability

A logistics company is designing a multi-region architecture for storing shipment images using Azure Block Blobs. To ensure high availability, the application must be able to write new images to the storage endpoints in both the primary and secondary Azure regions simultaneously. A junior architect suggests configuring the storage account with Read-Access Geo-Redundant Storage (RA-GRS). Why is this suggestion invalid?

  1. Read-Access Geo-Redundant Storage (RA-GRS) only allows read-only access to the secondary region, and write operations can only be performed on the primary region.Answer
  2. B
    Read-Access Geo-Redundant Storage (RA-GRS) behaves exactly like Locally Redundant Storage (LRS) and does not replicate data to a secondary region.
  3. C
    Read-Access Geo-Redundant Storage (RA-GRS) forces all replication to stay within a single Availability Zone (ZRS), which does not support multi-region access.
  4. D
    Read-Access Geo-Redundant Storage (RA-GRS) only supports active-active write access when configured as standard Geo-Redundant Storage (GRS).

Answer

Read-Access Geo-Redundant Storage (RA-GRS) only allows read-only access to the secondary region, and write operations can only be performed on the primary region.
The correct answer is correct because RA-GRS provides read-only access to the secondary endpoint. It does not support active-active multi-region write operations. All write operations must be sent to the primary endpoint.

Step-by-Step Solution

1
Analyze the technical requirement for the storage solution.
The application must write data directly and simultaneously to storage accounts in both the primary and secondary regions (active-active configuration).
This establishes the requirement for write capabilities on the secondary region.
2
Evaluate the capabilities of Read-Access Geo-Redundant Storage (RA-GRS).
RA-GRS replicates data to a secondary region, providing a secondary endpoint, but that endpoint is read-only.
This determines whether RA-GRS meets the write requirement.
3
Select the correct explanation for why the proposal is invalid.
The suggestion is invalid because the secondary region's endpoint in RA-GRS is read-only, preventing the required active-active writes.
This identifies the limitation that invalidates the architect's proposal.

Key Concept

Read-Access Geo-Redundant Storage (RA-GRS) provides read-only access to the secondary region's endpoint; it does not support active-active write access across regions.
Estimated Time:1m 0s
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Topics

Data Redundancy and High Availability

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