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Difficulty: MediumData Redundancy and High Availability

A digital banking platform is designing a storage solution for historical transaction records. The data will be stored in an Azure General Purpose v2 (GPv2) storage account. The platform's disaster recovery and high availability policies dictate the following constraints:

* The data must remain accessible even if a single datacenter in the primary region experiences a complete power outage.
* In the event of a major regional disaster affecting the primary region, the data must be recoverable in a secondary paired region.

Which two redundancy options satisfy these requirements? (Select two.)

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

Answer

The correct options are geo-zone-redundant storage (GZRS) and read-access geo-zone-redundant storage (RA-GZRS).
The correct redundancy tiers are geo-zone-redundant storage (GZRS) and read-access geo-zone-redundant storage (RA-GZRS). Both options replicate data synchronously across three availability zones in the primary region, protecting against localized datacenter outages, and copy data asynchronously to a secondary region, protecting against regional disasters.

Step-by-Step Solution

1
Determine the primary region resiliency requirement.
The storage solution must survive a localized datacenter outage in the primary region. This requires zone-redundant replication (ZRS, GZRS, or RA-GZRS) in the primary region.
Zone-redundancy replicates data across three physically separate availability zones within the primary region.
2
Determine the secondary region disaster recovery requirement.
The storage solution must support recovery in a secondary paired region in the event of a regional disaster. This requires geo-replication (GRS, GZRS, RA-GRS, or RA-GZRS).
Geo-replication copies data asynchronously to a secondary region to protect against regional outages.
3
Combine the requirements to identify the overlapping compliant redundancy tiers.
Only geo-zone-redundant storage (GZRS) and read-access geo-zone-redundant storage (RA-GZRS) satisfy both requirements.
Tiers like geo-redundant storage (GRS) fail the zone-redundant requirement in the primary region, while zone-redundant storage (ZRS) fails the geo-replication requirement.

Key Concept

Selecting Azure Storage redundancy tiers to meet combined local high availability (zonal) and disaster recovery (regional) objectives.
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Topics

Data Redundancy and High Availability

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