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Difficulty: MediumData Redundancy and High Availability

A media streaming platform needs to host user-uploaded images and subtitles in a standard Azure General Purpose v2 storage account. The design requires the data to survive a major regional disaster. Additionally, during a primary region outage, the application must be able to immediately switch to reading the images and subtitles from the secondary region without triggering any failover process. Which two replication tiers should the architect select?

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

Answer

Read-access geo-redundant storage (RA-GRS) and Read-access geo-zone-redundant storage (RA-GZRS) are the two replication tiers that meet all requirements.
Read-access geo-redundant storage (RA-GRS) and Read-access geo-zone-redundant storage (RA-GZRS) both replicate data to a secondary region for disaster resilience, and they provide a read-only secondary endpoint. This allows applications to immediately read data from the secondary region during a primary region outage without initiating a failover.

Step-by-Step Solution

1
Analyze the regional disaster resilience requirement.
Locally redundant storage (LRS) is ruled out because it only replicates data within a single datacenter in the primary region and cannot survive a regional disaster.
The system must survive a major regional disaster, requiring geo-redundant replication.
2
Analyze the secondary read access requirement.
Standard Geo-redundant storage (GRS) is ruled out because it does not allow read access to the secondary region unless a failover is initiated.
The application must be able to switch to reading from the secondary region immediately during an outage without waiting for or triggering a failover.
3
Select replication options that support both geo-redundancy and secondary read access.
Read-access geo-redundant storage (RA-GRS) and Read-access geo-zone-redundant storage (RA-GZRS) are selected.
Both RA-GRS and RA-GZRS replicate data to a secondary region and provide a secondary read-only endpoint that is immediately available.

Key Concept

Determining storage replication requirements for regional redundancy and immediate secondary read access in Azure Storage.
Estimated Time:1m 30s
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Topics

Data Redundancy and High Availability

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