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Difficulty: MediumData Redundancy and High Availability

A logistics enterprise plans to deploy a high-performance document processing system on Azure. The system requires SMB file shares hosted on the Premium tier of Azure Files to meet sub-millisecond metadata latency requirements. The storage configuration must remain resilient and available if a single physical datacenter in the primary region experiences a power outage. Which storage redundancy configuration should you recommend?

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

Answer

Zone-redundant storage (ZRS)
Zone-redundant storage (ZRS) synchronously replicates data across three separate physical datacenters (Availability Zones) in the primary region. This allows the system to survive a datacenter outage. Because Premium Azure Files supports only LRS and ZRS, Zone-redundant storage (ZRS) is the only valid configuration that satisfies both the resiliency requirement and the latency constraint.

Step-by-Step Solution

1
Analyze performance and protocol requirements.
Premium Azure Files is required to meet SMB protocol and sub-millisecond latency requirements.
Standard Azure Files does not guarantee sub-millisecond latencies, so the Premium tier must be selected.
2
Evaluate availability requirements against primary region datacenter failures.
Locally-redundant storage (LRS) is ruled out because it cannot survive a single datacenter outage.
LRS stores all replicas within one physical datacenter. Zone-redundancy is needed to survive zone/datacenter failures.
3
Check supported redundancy tiers for Premium Azure Files.
Premium Azure Files only supports Locally-redundant storage (LRS) and Zone-redundant storage (ZRS).
Geo-redundant configurations like GRS and GZRS are not supported for Premium tier file shares.

Key Concept

Azure Storage redundancy options and tier limitations
Estimated Time:1m 30s
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Topics

Data Redundancy and High Availability

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