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Difficulty: EasyDesign Storage and Non-Relational Data HA and DR

A company is designing a disaster recovery solution for its document management application. The architect proposes using an Azure Storage account configured with Read-Access Geo-Redundant Storage (RA-GRS). The plan assumes that the application running in the secondary region can write files directly to the secondary storage endpoint during normal operations or before a failover is initiated. Why is this design proposal incorrect?

  1. RA-GRS only provides read access to the secondary region; write operations cannot be performed on the secondary endpoint unless a failover is initiated.Answer
  2. B
    RA-GRS supports active-active write operations to both endpoints, but the application must write to both regions simultaneously using a multi-master replication configuration.
  3. C
    RA-GRS allows write operations to the secondary region, but they must be routed through Azure Traffic Manager to sync the transactions.
  4. D
    To enable write operations in the secondary region, the storage account must be configured with Locally Redundant Storage (LRS).

Answer

The option stating that RA-GRS only provides read access to the secondary region and write operations cannot be performed unless a failover is initiated is the correct answer.
The correct answer is correct because RA-GRS provides a read-only endpoint in the secondary region. During normal operations, write operations can only be sent to the primary region. Write access to the secondary region is only enabled after a failover occurs, which promotes the secondary region to the primary region.

Step-by-Step Solution

1
Analyze the capability of Read-Access Geo-Redundant Storage (RA-GRS).
RA-GRS provides read-only access to the replicated data in the secondary region under normal operating conditions.
To understand the read/write constraints of the proposed architecture.
2
Evaluate the application write requirements.
The application requires writing directly to the secondary region storage endpoint prior to a failover.
To determine if the write operations are supported in the secondary region.
3
Identify the limitation of RA-GRS write path.
Write operations to the secondary endpoint are blocked and only permitted after promoting the secondary region via failover.
To conclude why the proposed active-active write design is invalid.

Key Concept

Read-Access Geo-Redundant Storage (RA-GRS) replication and write path limitations
Estimated Time:45s
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Topics

Design Storage and Non-Relational Data HA and DR

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