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Difficulty: HardData Redundancy and High Availability

A financial services company is designing a storage solution for its document management platform using an Azure General Purpose v2 (GPv2) storage account. The platform has the following requirements:
- The data must remain highly available and survive the loss of an entire availability zone in the primary region.
- In the event of a regional disaster in the primary region, the platform must be able to read documents from a secondary paired region with a target Recovery Time Objective (RTO) of zero, without requiring a manual or managed storage failover.
- Cost and administrative overhead must be minimized.

Which redundancy configuration should you recommend for the storage account?

  1. Read-access geo-zone-redundant storage (RA-GZRS)Answer
  2. B
    Geo-zone-redundant storage (GZRS)
  3. C
    Read-access geo-redundant storage (RA-GRS)
  4. D
    Zone-redundant storage (ZRS)

Answer

Read-access geo-zone-redundant storage (RA-GZRS) is the correct choice because it replicates data across three availability zones in the primary region (protecting against zone outages) and provides read-only access to the secondary region endpoint without requiring a failover (ensuring a zero RTO for read operations).
Read-access geo-zone-redundant storage (RA-GZRS) replicates data synchronously across three Azure availability zones in the primary region, which allows the application to survive a zone outage. It also asynchronously replicates the data to a secondary paired region and exposes a read-only endpoint, allowing the application to read documents during a disaster without initiating a storage failover.

Step-by-Step Solution

1
Analyze the primary region high availability requirement.
The requirement to survive the loss of an entire availability zone in the primary region rules out Locally Redundant Storage (LRS) and Geo-Redundant Storage (GRS), which both use LRS within the primary region.
LRS replicates data within a single datacenter, making it vulnerable to zone-level failures.
2
Analyze the regional disaster recovery and RTO requirements.
The requirement to read data from a secondary region with an RTO of zero without a failover rules out standard GZRS and ZRS.
ZRS does not replicate to a secondary region, and GZRS requires a failover to make the secondary endpoint accessible.
3
Select the configuration that combines both zone redundancy and read-access geo-redundancy.
Read-access geo-zone-redundant storage (RA-GZRS) is selected.
RA-GZRS satisfies the zone survival requirement through primary ZRS replication and satisfies the zero-failover read requirement through read-access enablement in the secondary region.

Key Concept

Azure Storage Redundancy Tiers and Secondary Endpoint Access
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Topics

Data Redundancy and High Availability

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