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Difficulty: MediumData Redundancy and High Availability

An organization is designing the storage architecture for two Azure General Purpose v2 storage accounts with different business requirements:

* StorageAccount1: Stores machine learning models. The storage must survive a zone failure within the primary region and replicate to a secondary paired region to protect against a regional outage. Read access to the secondary region is not required.
* StorageAccount2: Stores static media assets. The storage must survive a zone failure within the primary region, replicate to a secondary region, and allow the application to read the media assets from the secondary region at any time without triggering a storage failover.

Which two redundancy options should you recommend to meet these requirements?

  1. Geo-zone-redundant storage (GZRS) for StorageAccount1Answer
  2. Read-access geo-zone-redundant storage (RA-GZRS) for StorageAccount2Answer
  3. C
    Geo-redundant storage (GRS) for StorageAccount1
  4. D
    Read-access geo-redundant storage (RA-GRS) for StorageAccount2
  5. E
    Zone-redundant storage (ZRS) for StorageAccount2

Answer

Geo-zone-redundant storage (GZRS) for StorageAccount1 and Read-access geo-zone-redundant storage (RA-GZRS) for StorageAccount2
The correct options are Geo-zone-redundant storage (GZRS) for StorageAccount1 and Read-access geo-zone-redundant storage (RA-GZRS) for StorageAccount2. GZRS replicates data across three availability zones in the primary region and copies it to a secondary region, which satisfies the zone survival and regional replication requirements for StorageAccount1. RA-GZRS provides the same zonal and regional protection while also enabling read access to the secondary region without failover, satisfying all requirements for StorageAccount2.

Step-by-Step Solution

1
Analyze the requirements for StorageAccount1
StorageAccount1 requires survival of zone outages in the primary region (zonal redundancy) and replication to a secondary region (geo-redundancy), with no secondary read access needed. This points to Geo-zone-redundant storage (GZRS).
GZRS combines the high availability of zone-redundant storage (ZRS) with the disaster recovery of geo-redundant storage (GRS).
2
Analyze the requirements for StorageAccount2
StorageAccount2 requires survival of zone outages in the primary region (zonal redundancy), replication to a secondary region (geo-redundancy), and read access to the secondary region without failover (read-access). This points to Read-access geo-zone-redundant storage (RA-GZRS).
RA-GZRS adds read-only endpoints in the secondary region to GZRS, allowing applications to read data from the secondary region without initiating a failover.

Key Concept

Selecting Azure Storage redundancy tiers to meet availability (zone-redundancy) and disaster recovery (geo-redundancy and read access) requirements.
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Topics

Data Redundancy and High Availability

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