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Difficulty: MediumData Redundancy and High Availability

A healthcare provider is designing a high-performance storage solution for medical imaging applications. The solution requires using Azure Premium Files (NFS) to store image files that demand low, sub-millisecond latencies. The storage configuration must remain available and survive the failure of a single physical datacenter (Availability Zone) within the primary Azure region. Which redundancy configuration should you recommend?

  1. Zone-redundant storage (ZRS)Answer
  2. B
    Locally-redundant storage (LRS)
  3. C
    Geo-redundant storage (GRS)
  4. D
    Geo-zone-redundant storage (GZRS)

Answer

Zone-redundant storage (ZRS)
Zone-redundant storage (ZRS) synchronously replicates data across three Azure availability zones in the primary region, ensuring the storage remains available during a datacenter outage. Because Azure Premium Files only supports LRS and ZRS configurations, ZRS is the only option that meets the high availability requirement.

Step-by-Step Solution

1
Identify the storage tier and protocol requirements.
The application requires Azure Premium Files (NFS) to satisfy the sub-millisecond latency requirement.
This isolates the redundancy options to those supported by the Premium Files tier.
2
Determine the supported redundancy options for the Premium Files tier.
Premium Files only supports Locally-redundant storage (LRS) and Zone-redundant storage (ZRS).
Geo-redundant options (GRS and GZRS) are unsupported on the Premium Files tier.
3
Select the option that meets the high availability constraint.
Zone-redundant storage (ZRS) replicates data synchronously across three availability zones, surviving a single datacenter failure.
Locally-redundant storage (LRS) replicates data only within a single datacenter and cannot survive a zone outage.

Key Concept

Azure Storage redundancy options and constraints across different performance tiers
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Topics

Data Redundancy and High Availability

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