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

VeloStyle Retail is designing a disaster recovery and business continuity solution for its product catalog images, which are stored in a general-purpose v2 Azure Storage account in the East US region.

The solution must meet the following requirements:
- During a primary region outage, the application must maintain read access to the images from the secondary region (West US) with a Recovery Time Objective (RTO) of zero.
- The application must support writing new images once a failover to the secondary region is initiated.
- Regional resilience must be maximized, while keeping replication costs minimized compared to multi-zone cross-region setups.

Which two actions should you include in the design to meet these requirements? (Select TWO.)

  1. Configure the storage account replication to Read-access geo-redundant storage (RA-GRS).Answer
  2. Initiate a customer-managed failover of the storage account to the West US region to restore write capability during a primary region outage.Answer
  3. C
    Configure the application to write new images directly to the secondary storage endpoint during the outage without initiating a failover.
  4. D
    Configure the storage account replication to Locally redundant storage (LRS) and use Azure Site Recovery to replicate the blob data.

Answer

Configure the storage account replication to Read-access geo-redundant storage (RA-GRS) and initiate a customer-managed failover of the storage account to the West US region to restore write capability during a primary region outage.
The correct options are configuring the replication to Read-access geo-redundant storage (RA-GRS) and initiating a customer-managed failover to the secondary region during an outage. RA-GRS provides a secondary read-only endpoint that is always accessible, ensuring a read RTO of zero. To restore write functionality, a customer-managed failover is required to swap the primary and secondary regions, making the secondary region the new primary region with write support.

Step-by-Step Solution

1
Select a geo-redundant storage replication tier that supports read access to the secondary region without a failover.
Read-access geo-redundant storage (RA-GRS) is selected as it meets the RTO of zero for reads and is more cost-effective than zone-redundant storage tiers.
Standard GRS does not allow read access to the secondary endpoint until a failover is initiated, which would fail the RTO=0 read requirement.
2
Determine the mechanism for restoring write access during a primary region outage.
Initiate a customer-managed failover of the storage account.
Under RA-GRS, the secondary endpoint is read-only. A failover must be initiated to promote the secondary region to primary, which enables write access.

Key Concept

Azure Storage replication failover behavior and secondary endpoint access controls.
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Topics

Design Storage and Non-Relational Data HA and DR

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