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Zorluk: KolayDesign Storage and Non-Relational Data HA and DR

A financial services company is designing a disaster recovery solution for its transaction logs stored in Azure Blob Storage. The architect recommends configuring the storage account with Read-Access Geo-Redundant Storage (RA-GRS). The development team is updating the client application to handle failover scenarios and needs to understand the write capabilities of this storage design. Which two statements correctly describe the write operations behavior for this configuration? (Select two.)

  1. Write operations can only be performed on the primary endpoint during normal operations.Cevap
  2. B
    Write operations can be directed to the secondary endpoint under normal operations to enable active-active replication.
  3. Write operations can be performed on the secondary endpoint only after a failover has been initiated and completed.Cevap
  4. D
    Write operations are automatically redirected to the secondary endpoint for immediate writes if the primary endpoint experiences an outage.

Cevap

Write operations are restricted to the primary endpoint during normal operations, and they can only be performed on the secondary endpoint after a failover has been initiated and completed.
The correct options are those stating that write operations are confined to the primary endpoint during normal operations and can only be performed on the secondary endpoint after a failover is initiated and completed. Under RA-GRS, the secondary endpoint provides read-only access prior to failover. Performing a failover promotes the secondary endpoint to the primary read-write role, enabling write capabilities.

Adım Adım Çözüm

1
Analyze the configuration of Read-Access Geo-Redundant Storage (RA-GRS).
Identify that RA-GRS provides read-write access to the primary endpoint and read-only access to the secondary endpoint under normal operating conditions.
This establishes the baseline capability of the secondary endpoint before any disruption occurs.
2
Determine the state of write operations during normal operations and outages.
Confirm that write operations cannot be sent directly to the secondary endpoint, nor are they automatically redirected to the secondary endpoint for writing during an outage.
This rules out active-active write scenarios and automatic write failover.
3
Identify the mechanism required to enable write access in the secondary region.
Establish that a failover must be initiated to promote the secondary endpoint to a read-write role.
This determines how write capabilities are restored in a disaster recovery scenario.

Anahtar Kavram

Write capabilities of RA-GRS during normal operations and secondary failovers
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