Examkin

Question

Difficulty: MediumData Redundancy and High Availability

A healthcare provider plans to store patient telemetry logs in an Azure General Purpose v2 storage account. The storage configuration must meet the following requirements:

* Telemetry logs must remain writeable in the primary region even if an entire Azure availability zone (datacenter) within that region goes offline.
* The logs must be replicated to a secondary Azure region to ensure business continuity in the event of a regional disaster.
* The application running in the secondary region does not require read access to the logs unless a failover to the secondary region is initiated.
* The solution must minimize costs.

Which redundancy option should you recommend?

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

Answer

Geo-zone-redundant storage (GZRS) is the optimal configuration because it replicates data across three availability zones in the primary region (protecting against zone outages) and copies it asynchronously to a secondary region, without incurring the extra cost of read access to the secondary region.
Geo-zone-redundant storage (GZRS) provides high availability for write operations in the primary region by spreading data across three availability zones. It also replicates data asynchronously to a secondary region for disaster recovery. Since read access to the secondary region is not required before failover, GZRS meets all constraints at the lowest cost.

Step-by-Step Solution

1
Analyze primary region availability requirements.
The requirement states writes must continue if an availability zone fails. This rules out Locally Redundant Storage (LRS) options in the primary region, meaning the primary configuration must be Zone-Redundant (ZRS).
ZRS replicates data across three separate zones in the primary region, allowing write operations to continue if one zone goes offline.
2
Analyze secondary region replication requirements.
The data must replicate to a secondary region to protect against regional disasters. This requires geo-replication, pointing to either GZRS or RA-GZRS.
Standard ZRS only protects within a single region and lacks secondary region replication.
3
Evaluate read access requirements and cost constraints.
Read access to the secondary region is not needed unless a failover is initiated, which makes RA-GZRS unnecessary.
GZRS provides the required zone redundancy and geo-replication at a lower cost than RA-GZRS, which provides active read-only endpoints in the secondary region.

Key Concept

Azure storage redundancy tiers (LRS, ZRS, GRS, GZRS) and their recovery characteristics.
Rate this question

Topics

Data Redundancy and High Availability

More questions from this topic