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Difficulty: HardBlob, File, and Disk Storage Solutions

An enterprise database hosting platform is migrating its critical transactional database to Azure Virtual Machines. The virtual machines are deployed in a high-availability configuration across multiple Availability Zones in a single Azure region.

The database transaction log drive requires a storage solution that meets the following requirements:
- Must sustain at least 12,00012,000 IOPS.
- Must provide consistent low latency.
- Must remain online and accessible to virtual machines in another availability zone if the primary availability zone suffers a complete power outage.

Which storage configuration should you recommend?

  1. Premium SSD managed disks configured with Zone-Redundant Storage (ZRS)Answer
  2. B
    Premium SSD v2 managed disks configured with Locally Redundant Storage (LRS)
  3. C
    Ultra Disk managed disks configured with Locally Redundant Storage (LRS)
  4. D
    Standard SSD managed disks configured with Zone-Redundant Storage (ZRS)

Answer

Premium SSD managed disks configured with Zone-Redundant Storage (ZRS)
The correct option is the one specifying Premium SSD managed disks with Zone-Redundant Storage (ZRS). Premium SSDs can meet the 12,00012,000 IOPS requirement with consistent low latency, and ZRS replicates the data across three availability zones in the region, ensuring access is maintained if the primary zone fails.

Step-by-Step Solution

1
Analyze the availability requirements.
The storage must survive a complete zone outage and be accessible in another zone.
This eliminates any disk options that only support Locally Redundant Storage (LRS).
2
Evaluate the redundancy capabilities of Azure disk types.
Ultra Disk and Premium SSD v2 only support LRS, whereas Premium SSD and Standard SSD support Zone-Redundant Storage (ZRS).
Knowing which disk types support ZRS narrows down the candidate disks to Premium SSD and Standard SSD.
3
Evaluate the performance requirements of the database transaction log.
The log requires at least 12,00012,000 IOPS and consistent low latency. Standard SSD supports a maximum of 6,0006,000 IOPS and lacks low-latency guarantees, while Premium SSD can provision up to 20,00020,000 IOPS (depending on disk size) with single-digit millisecond latency.
Premium SSD with ZRS is the only option that satisfies both the 12,00012,000 IOPS performance threshold and the zone-redundancy availability requirement.

Key Concept

Selecting Azure managed disk types and redundancy configurations based on performance and zonal availability requirements.
Estimated Time:2m 0s
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Topics

Blob, File, and Disk Storage Solutions

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