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

AeroTerra GeoServices is designing a business continuity solution for a seismic telemetry ingestion system. The system continuously writes incoming sensor data to an Azure Storage account.

The design must meet the following requirements:
- Recovery Point Objective (RPORPO): Less than 15 minutes.
- Recovery Time Objective (RTORTO): Less than 1 hour.
- Read Availability: The analytics application must have continuous read access to telemetry data, even during a primary region outage.
- Write Availability: Telemetry writes must be restored in a secondary region within the RTORTO.
- Cost: Minimize costs by avoiding multi-region active-active write configurations.

To achieve this, the architect proposes using a Read-Access Geo-Redundant Storage (RA-GRS) account and performing a customer-managed failover in the event of a primary region disaster.

Which two statements correctly describe the data access capabilities and failover behavior for this storage configuration? (Select two.)

  1. Prior to initiating the failover, the secondary region endpoint is read-only, and any attempt to write data directly to the secondary region will fail.Cevap
  2. Upon completion of the customer-managed failover, the storage account replication type is automatically converted to Locally Redundant Storage (LRS) in the new primary region.Cevap
  3. C
    Prior to initiating the failover, the storage account supports active-active write operations across both the primary and secondary regions to balance the write load.
  4. D
    To further reduce storage costs while maintaining regional disaster resilience, the storage account can be configured with Locally Redundant Storage (LRS) in the primary region.

Cevap

The secondary region endpoint remains read-only before the failover is initiated, and once the customer-managed failover completes, the storage account replication type is automatically converted to Locally Redundant Storage (LRS) in the new primary region.
Read-Access Geo-Redundant Storage (RA-GRS) provides read-only access to the secondary region during normal operations, so write operations directed to the secondary region prior to failover will fail. When a customer-managed failover is completed, the secondary region becomes the new primary region, and the replication configuration is automatically changed to Locally Redundant Storage (LRS).

Adım Adım Çözüm

1
Analyze the read and write capability requirements during normal operations and during a disaster.
The system requires read access from the secondary region prior to failover and writes to be restored in the secondary region after a disaster within the RTORTO.
This matches the behavior of Read-Access Geo-Redundant Storage (RA-GRS).
2
Evaluate the write capabilities of the secondary region prior to initiating a failover.
The secondary region is read-only, and direct writes are blocked.
RA-GRS only supports read access on the secondary endpoint during normal operations.
3
Determine the state of the storage account replication after the failover completes.
The storage account replication type is changed to Locally Redundant Storage (LRS).
Azure automatically converts geo-redundant storage to locally redundant storage in the new primary region when a customer-managed failover is executed.

Anahtar Kavram

Azure Storage replication failover behavior and write constraints of RA-GRS
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