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Difficulty: MediumData Redundancy and High Availability

A pharmaceutical research company is designing a storage solution for clinical trial data using Azure Blob Storage. The data is stored in a General Purpose v2 (GPv2) storage account. The solution must satisfy the following requirements:

* The primary storage must survive the failure of an entire availability zone within the primary region without any downtime or data loss.
* In the event of a complete primary region failure, read operations must continue from a secondary region with a minimal recovery time objective (RTO), without waiting for a failover to be initiated.

Which storage redundancy option should you recommend?

  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)
Read-access geo-zone-redundant storage (RA-GZRS) is correct because it combines the zonal replication of ZRS in the primary region with geo-replication to a secondary region. Crucially, it provides a read-only endpoint in the secondary region, allowing applications to read data immediately during a primary region failure without waiting for a failover.

Step-by-Step Solution

1
Identify the primary region resiliency requirement.
To survive an availability zone failure without downtime or data loss, the data must be replicated across multiple availability zones in the primary region. This narrows the choices to Zone-redundant storage (ZRS), Geo-zone-redundant storage (GZRS), or Read-access geo-zone-redundant storage (RA-GZRS).
Zonal resilience requires zone-redundant options in the primary region.
2
Identify the regional disaster recovery requirement.
The solution must survive a complete primary region failure, which eliminates ZRS because it only replicates data within the primary region.
Regional disaster recovery requires a geo-redundant storage option.
3
Evaluate read availability requirements during a regional outage.
The company requires read operations to continue from the secondary region without waiting for a failover to be initiated. GZRS requires a manual or customer-managed failover to make the secondary region active, whereas RA-GZRS provides a read-only endpoint in the secondary region that is immediately available for reads.
Immediate read access during regional failover without intervention requires read-access enabled geo-redundant storage.

Key Concept

Selecting the optimal Azure storage redundancy tier based on zonal availability, regional disaster recovery, and read-access requirements.
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Topics

Data Redundancy and High Availability

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