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Difficulty: EasyBlob, File, and Disk Storage Solutions

You are designing an Azure storage solution for critical database backups. The backups must remain available and survive the physical failure of a primary Azure datacenter. To minimize costs, you must avoid replicating data across different Azure regions. Which storage redundancy option should you recommend?

  1. Zone-redundant storage (ZRS)Answer
  2. B
    Locally redundant storage (LRS)
  3. C
    Read-access geo-redundant storage (RA-GRS) with active-active write access
  4. D
    Standard HDD storage with locally redundant storage (LRS)

Answer

Zone-redundant storage (ZRS)
Zone-redundant storage (ZRS) replicates data synchronously across three Azure availability zones in the primary region. Because availability zones are physically separate datacenters with independent power, cooling, and networking, ZRS ensures that the backups remain available even if a primary datacenter fails. Furthermore, it keeps data within the primary region, minimizing costs and satisfying the constraint against cross-region replication.

Step-by-Step Solution

1
Analyze the resiliency and datacenter failure requirements.
The backups must survive the physical failure of a primary Azure datacenter.
This rules out Locally redundant storage (LRS), which only replicates data within a single datacenter.
2
Evaluate the cost and regional replication constraints.
The solution must minimize costs and avoid replicating data across different Azure regions.
This rules out Geo-redundant storage (GRS) and Read-access geo-redundant storage (RA-GRS), which replicate data to a secondary region and incur higher costs.
3
Select the option that meets both datacenter resiliency and local region constraints.
Zone-redundant storage (ZRS) meets these requirements by replicating data across three separate availability zones within the primary region.
ZRS provides zone-level resiliency against datacenter outages without the cost and complexity of cross-region replication.

Key Concept

Selecting the appropriate Azure storage redundancy option based on cost, regional constraints, and resiliency requirements.
Estimated Time:45s
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Topics

Blob, File, and Disk Storage Solutions

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