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Difficulty: HardData Redundancy and High Availability

A multinational retail corporation is designing the storage architecture for its global inventory ledger application. The application stores ledger files in a General Purpose v2 storage account. The solution must satisfy the following requirements:

* In the primary region, the data must be replicated across three separate physical facilities (availability zones) to protect against datacenter-level failures.
* In the event of a primary region disaster, the application must be able to perform read operations on the inventory ledger files in the secondary paired region immediately, without waiting for a customer-managed or Microsoft-managed failover.
* Write operations to the secondary region are not required during a primary region outage.

Which redundancy option should you recommend for the storage account?

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

Answer

Read-access geo-zone-redundant storage (RA-GZRS)
Read-access geo-zone-redundant storage (RA-GZRS) replicates data across three separate availability zones in the primary region (satisfying the zone-resiliency requirement) and replicates it to a secondary region. Crucially, the read-access feature enables immediate read capability from the secondary region endpoint without requiring a failover operation.

Step-by-Step Solution

1
Analyze primary region redundancy requirement.
The requirement states that data must be replicated across three separate physical facilities (availability zones) in the primary region. This narrows the primary region storage type to Zone-Redundant Storage (ZRS) or Geo-Zone-Redundant Storage (GZRS). Locally Redundant Storage (LRS) and Geo-Redundant Storage (GRS) are eliminated because they replicate within a single facility.
Eliminate options that fail primary region resiliency requirements.
2
Analyze disaster recovery and secondary region read requirements.
The solution requires the ability to read from the secondary paired region immediately during a primary outage without initiating a failover. This requires a read-access (RA) suffix, narrowing the choices to RA-GRS or RA-GZRS.
Eliminate options that do not allow immediate read access to the secondary region without failover.
3
Combine primary zone redundancy and secondary read-access requirements.
Combining the requirement for ZRS in the primary region (from Step 1) with Read-Access to the secondary region (from Step 2) yields Read-access geo-zone-redundant storage (RA-GZRS).
Identify the storage tier that satisfies all constraints.

Key Concept

Selecting the optimal Azure storage redundancy tier based on zonal, regional, and read-access requirements.
Estimated Time:2m 0s
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Topics

Data Redundancy and High Availability

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