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Difficulty: Very hardData Redundancy and High Availability

A corporate client is designing the storage infrastructure for a new core banking system in Azure. The design specifies two storage accounts:

1. `recordsstore`: A General Purpose v2 storage account hosting transactional PDF statements. The statements must survive a regional disaster. The secondary region must be readable at all times to serve read-only queries from reporting systems, and the data must be resilient to zone failures within the primary region.
2. `appfiles`: A Premium file share hosting critical configuration files that require sub-millisecond latency. The share must remain available if a datacenter within the primary region fails.

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

  1. Read-access geo-zone-redundant storage (RA-GZRS) for recordsstoreAnswer
  2. Zone-redundant storage (ZRS) for appfilesAnswer
  3. C
    Read-access geo-redundant storage (RA-GRS) for recordsstore
  4. D
    Geo-zone-redundant storage (GZRS) for recordsstore
  5. E
    Geo-zone-redundant storage (GZRS) for appfiles
  6. F
    Locally redundant storage (LRS) for appfiles

Answer

Select Read-access geo-zone-redundant storage (RA-GZRS) for recordsstore and Zone-redundant storage (ZRS) for appfiles.
The correct options are the combination of Read-access geo-zone-redundant storage (RA-GZRS) for recordsstore and Zone-redundant storage (ZRS) for appfiles. For recordsstore, RA-GZRS ensures zone-resiliency within the primary region while also providing read-access to the secondary region before failover. For appfiles, ZRS is required to survive a datacenter failure within the primary region, and it is the highest redundancy tier supported by Azure Premium Files (FileStorage accounts).

Step-by-Step Solution

1
Analyze the resiliency and access requirements for recordsstore.
The requirements demand primary region zone resiliency (ruling out LRS and GRS), regional disaster resilience (requiring geo-replication like GRS/GZRS), and secondary region read access before failover (requiring RA- prefix).
Identifying these three constraints leads to selecting Read-access geo-zone-redundant storage (RA-GZRS).
2
Analyze the performance and availability requirements for appfiles.
The premium file share requires sub-millisecond latency (requiring Premium Files / FileStorage account) and must survive a primary region datacenter failure (requiring zone-redundancy).
Understanding the limitations of Premium Files storage accounts restricts the available redundancy configurations to LRS and ZRS.
3
Map the appfiles constraints to the supported Premium Files options.
Since only LRS and ZRS are supported for Premium Files, and the share must survive a zone failure, Zone-redundant storage (ZRS) must be selected.
This rules out LRS due to lack of zone resiliency, and rules out GZRS/GRS because they are unsupported by Premium File storage accounts.

Key Concept

Azure storage redundancy tiers and their limitations across standard and premium storage account types.
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Topics

Data Redundancy and High Availability

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