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

Verdant Power Solutions is designing a business continuity solution for an application that processes wind turbine telemetry data. The application continuously writes transactional log files to an Azure Storage account.

The solution must satisfy the following requirements:
- Recovery Point Objective (RPO): Less than 1515 minutes.
- Recovery Time Objective (RTO): Less than 3030 minutes.
- Read availability: Telemetry data must remain readable from a secondary region during a primary region outage.
- Write availability: Write capabilities must be restored in the secondary region within the RTO during a primary region outage.
- Cost: Storage costs must be minimized.

Which storage redundancy configuration and disaster recovery procedure should you recommend?

  1. Configure the storage account to use Read-Access Geo-Redundant Storage (RA-GRS) and initiate a customer-managed failover to the secondary region during an outage.Answer
  2. B
    Configure the storage account to use Read-Access Geo-Redundant Storage (RA-GRS) and configure the application to write directly to the secondary endpoint when the primary region is unavailable.
  3. C
    Configure the storage account to use Geo-Redundant Storage (GRS) and configure the application to read from the secondary endpoint during a primary region outage.
  4. D
    Configure the storage account to use Locally Redundant Storage (LRS) and configure Azure Backup to replicate snapshots to a secondary region vault every 15 minutes.

Answer

Configure the storage account to use Read-Access Geo-Redundant Storage (RA-GRS) and initiate a customer-managed failover to the secondary region during an outage.
The correct answer configuration uses Read-Access Geo-Redundant Storage (RA-GRS) combined with customer-managed failover. RA-GRS ensures that data is geo-replicated and readable from the secondary region's secondary endpoint during a primary outage. Initiating a customer-managed failover promotes the secondary region to primary, restoring write capabilities within the required 30-minute RTO.

Step-by-Step Solution

1
Analyze the read availability requirement during a primary region outage.
Standard Geo-Redundant Storage (GRS) does not allow read access to the secondary region during a primary outage unless a failover is initiated. Only Read-Access Geo-Redundant Storage (RA-GRS) provides a secondary read-only endpoint that remains accessible.
Ensures the solution satisfies the read availability requirement during an outage.
2
Analyze the write availability and RTO requirements.
To restore write availability in the secondary region within the 30-minute RTO, a customer-managed failover must be initiated. A Microsoft-managed failover does not guarantee a specific timeline and is reserved for major disasters.
Determines the correct procedure to resume write capabilities within the RTO envelope.
3
Evaluate the write capabilities of RA-GRS.
The secondary endpoint is read-only. Writes cannot be redirected to the secondary endpoint without completing a failover, which promotes the secondary region to the primary role.
Eliminates incorrect configuration proposals that attempt direct writes to the read-only secondary endpoint.

Key Concept

Azure Storage Disaster Recovery and Redundancy
Estimated Time:1m 30s
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Topics

Design Storage and Non-Relational Data HA and DR

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