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

A pharmaceutical company named Apex BioPharm is designing a business continuity solution for a clinical trials database application. The application writes critical patient monitoring logs to an Azure Storage account.

The solution must meet the following requirements:
- If the primary Azure region experiences an outage, data must remain readable from the secondary region.
- In the event of a disaster, write capabilities must be restored in the secondary region with a Recovery Time Objective (RTO) of 22 hours.
- The Recovery Point Objective (RPO) must be less than 1515 minutes.
- Costs must be minimized.

Which two actions should you recommend to meet the requirements? (Select TWO.)

  1. Configure the storage account to use Read-access geo-redundant storage (RA-GRS).Answer
  2. Initiate a customer-managed failover of the storage account to the secondary region if a primary region outage occurs.Answer
  3. C
    Configure the application to redirect write operations to the secondary storage endpoint if the primary endpoint becomes unavailable.
  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 1212 hours.

Answer

The correct actions are to configure the storage account to use Read-access geo-redundant storage (RA-GRS) and to initiate a customer-managed failover of the storage account to the secondary region during a primary region outage.
To support read availability in the secondary region during a primary region outage, the storage account must be configured with Read-access geo-redundant storage (RA-GRS). RA-GRS provides a secondary read-only endpoint. Because the secondary endpoint is read-only, write operations cannot be routed to it directly. To restore write capabilities in the secondary region within the 22-hour RTO, you must initiate a customer-managed failover, which changes the secondary region to the primary region and makes it writable.

Step-by-Step Solution

1
Evaluate redundancy options to meet RPO and read availability requirements.
Selecting Read-access geo-redundant storage (RA-GRS) ensures asynchronous replication to a secondary region with an RPO of under 1515 minutes and allows read access to the secondary region during a primary outage.
Locally Redundant Storage (LRS) does not provide geo-redundancy, and standard GRS without read access would not allow reading from the secondary region prior to failover.
2
Determine how to restore write availability within the RTO.
Initiating a customer-managed failover converts the secondary region into the new primary, enabling full read and write access.
Writes cannot be performed directly to the secondary endpoint of an RA-GRS account, so a failover is required to restore write capabilities.

Key Concept

Designing storage redundancy and geo-failover strategies in Azure to meet specific recovery objectives (RTO and RPO).
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Topics

Design Storage and Non-Relational Data HA and DR

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