Examkin

Question

Difficulty: MediumData Redundancy and High Availability

A marine logistics company is designing a storage solution for real-time cargo container tracking data. The data is stored in an Azure General Purpose v2 (GPv2) storage account. The design must satisfy the following requirements:

- The data must survive a regional disaster and remain available for read-only reporting in the secondary region without initiating a failover.
- The storage system in the primary region must tolerate the loss of an entire datacenter zone without data loss or service disruption.
- Tracking reports must be generated instantly, requiring sub-second retrieval times for all data stored in the account.

Which storage configuration should you recommend?

  1. A
    Read-access geo-redundant storage (RA-GRS) using the Hot access tier, with applications configured to write tracking data directly to both the primary and secondary endpoints
  2. Read-access geo-zone-redundant storage (RA-GZRS) using the Hot access tierAnswer
  3. C
    Locally redundant storage (LRS) using the Cool access tier
  4. D
    Read-access geo-zone-redundant storage (RA-GZRS) using the Archive access tier

Answer

Read-access geo-zone-redundant storage (RA-GZRS) using the Hot access tier
Read-access geo-zone-redundant storage (RA-GZRS) replicates data synchronously across three availability zones in the primary region, ensuring protection against zone outages. It also replicates data asynchronously to a secondary region and enables read access to the secondary endpoint. Using the Hot access tier ensures that tracking reports can be generated instantly with sub-second retrieval latency.

Step-by-Step Solution

1
Analyze the availability zone and regional recovery constraints.
The primary region requires zone-level resilience (ZRS) and the secondary region requires read-access geo-redundancy (RA-GRS/RA-GZRS), leading to RA-GZRS.
To determine the minimal redundancy tier that satisfies both zone-redundancy and cross-region read requirements.
2
Evaluate write capability requirements on the secondary endpoint.
The secondary endpoint is read-only; active-active write configurations are unsupported for geo-redundant storage.
To rule out configurations that incorrectly assume write capabilities on the secondary region.
3
Determine the correct storage access tier based on retrieval latency requirements.
Sub-second retrieval requires Hot or Cool access tiers; Archive tier is excluded due to rehydration delays.
To select an online access tier that meets the performance requirements of the reporting application.

Key Concept

Selecting the optimal Azure Storage redundancy tier (RA-GZRS) and access tier (Hot) based on zonal/regional availability and performance requirements.
Rate this question

Topics

Data Redundancy and High Availability

More questions from this topic