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Difficulty: MediumData Redundancy and High Availability

A financial services firm is designing the Azure storage architecture for two distinct workloads using Azure Blob Storage:

1. Workload A (Transaction Logs): Must be resilient to the failure of a datacenter within the primary region without data loss, must be replicated to a secondary region to protect against regional disasters, and does not require read access to the secondary region unless a failover is initiated.
2. Workload B (Reporting Data): Must be resilient to the failure of a datacenter within the primary region without data loss, must be replicated to a secondary region, and must allow reporting applications to read data from the secondary region without waiting for a failover to be initiated.

Which two redundancy options should you select to meet the requirements for Workload A and Workload B? (Select two.)

  1. Geo-zone-redundant storage (GZRS) for Workload AAnswer
  2. Read-access geo-zone-redundant storage (RA-GZRS) for Workload BAnswer
  3. C
    Geo-redundant storage (GRS) for Workload A
  4. D
    Read-access geo-redundant storage (RA-GRS) for Workload B
  5. E
    Zone-redundant storage (ZRS) for Workload A
  6. F
    Locally-redundant storage (LRS) for Workload B

Answer

Geo-zone-redundant storage (GZRS) for Workload A and Read-access geo-zone-redundant storage (RA-GZRS) for Workload B.
Selecting Geo-zone-redundant storage (GZRS) for Workload A and Read-access geo-zone-redundant storage (RA-GZRS) for Workload B meets all requirements. Workload A needs zonal redundancy in the primary region to prevent data loss from a single datacenter failure and asynchronous replication to a secondary region, without needing read access to the secondary, making GZRS the correct choice. Workload B has the same replication requirements but also requires read-only access to the secondary region without initiating a failover, which requires RA-GZRS.

Step-by-Step Solution

1
Analyze the requirements for Workload A.
Workload A requires datacenter outage resilience in the primary region without data loss (which requires Zone-Redundant Storage, ZRS, at the primary region), replication to a secondary region (which requires Geo-replication), and no read access to the secondary region without failover. This points to Geo-zone-redundant storage (GZRS).
Selecting GZRS ensures ZRS-level replication at the primary site and asynchronous replication to the secondary site.
2
Analyze the requirements for Workload B.
Workload B requires datacenter outage resilience in the primary region without data loss (which requires ZRS at the primary region), replication to a secondary region (which requires Geo-replication), and read access to the secondary region without waiting for a failover. This points to Read-access geo-zone-redundant storage (RA-GZRS).
Selecting RA-GZRS combines the zonal redundancy in the primary region with read-only access to the secondary region without initiating a failover.

Key Concept

Understanding Azure storage redundancy configurations and how they protect against datacenter and regional outages, as well as enabling secondary region read access.
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Topics

Data Redundancy and High Availability

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