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Difficulty: MediumData Redundancy and High Availability

A company is designing a storage solution using a General Purpose v2 storage account to store block blobs containing media files for a web application in the East US region. The storage solution must meet the following requirements:

* Provide resilience against the outage of a single datacenter zone within the primary region.
* Provide regional disaster recovery by replicating the data to a secondary region.
* Minimize costs by avoiding charges for read access to the secondary region, which is not required.

Which redundancy option should you select for the storage account?

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

Answer

Geo-zone-redundant storage (GZRS)
Geo-zone-redundant storage (GZRS) is correct because it combines the zone-level redundancy of ZRS in the primary region with the regional replication of GRS. It copies data across three availability zones in the primary region, safeguarding against zone failures, and replicates it asynchronously to a secondary region for disaster recovery, all without paying the extra premium for read-access to the secondary region.

Step-by-Step Solution

1
Analyze the primary region availability requirement.
The solution must survive a zone failure in the primary region, which requires a zone-redundant option (ZRS or GZRS) rather than a locally-redundant option (LRS or GRS).
LRS and GRS store data within a single availability zone in the primary region, making them vulnerable to zone outages.
2
Analyze the regional disaster recovery requirement.
The solution must replicate data to a secondary region, which requires a geo-redundant option (GZRS) rather than a zone-only option (ZRS).
ZRS does not replicate data outside the primary region.
3
Evaluate read-access requirements and cost constraints.
Since read access to the secondary region is not required, choosing GZRS instead of RA-GZRS minimizes cost.
RA-GZRS incurs additional charges for providing read access to the secondary replica.

Key Concept

Selecting the optimal Azure storage redundancy tier based on zonal availability, regional disaster recovery, and cost constraints.
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Topics

Data Redundancy and High Availability

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