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Difficulty: EasyData Redundancy and High Availability

A medical records company is designing an Azure Storage solution for document uploads. The system requirements specify that all uploaded documents must be replicated synchronously across three distinct availability zones within the primary region to protect against a localized datacenter failure.

Which two redundancy options meet these requirements?

  1. Zone-redundant storage (ZRS)Answer
  2. Geo-zone-redundant storage (GZRS)Answer
  3. C
    Locally-redundant storage (LRS)
  4. D
    Geo-redundant storage (GRS)

Answer

Zone-redundant storage (ZRS) and Geo-zone-redundant storage (GZRS) meet the requirements because they replicate data synchronously across three availability zones in the primary region.
Zone-redundant storage (ZRS) and Geo-zone-redundant storage (GZRS) both replicate data synchronously across three Azure availability zones in the primary region, meeting the requirement to survive a localized zone or datacenter outage.

Step-by-Step Solution

1
Analyze the requirement for synchronous replication in the primary region.
The solution must replicate data across three distinct availability zones synchronously in the primary region.
This establishes that the primary storage redundancy configuration must be zone-redundant.
2
Evaluate the replication behavior of each Azure Storage option.
Zone-redundant storage (ZRS) and Geo-zone-redundant storage (GZRS) use zone-redundant replication (synchronous replication across three zones) in the primary region. Locally-redundant storage (LRS) and Geo-redundant storage (GRS) use locally-redundant replication (synchronous replication within a single facility) in the primary region.
Identifying the primary replication mechanism for each tier determines which options meet the criteria.
3
Select the options that provide primary zone redundancy.
Zone-redundant storage (ZRS) and Geo-zone-redundant storage (GZRS) are selected.
Both options ensure that data is synchronously written to three availability zones in the primary region, surviving a zone-level outage.

Key Concept

Data replication strategies in Azure Storage, focusing on primary region zone redundancy (ZRS/GZRS) versus local redundancy (LRS/GRS).
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Topics

Data Redundancy and High Availability

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