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Difficulty: Very hardAzure Storage Accounts, Blob, Disk, Files, and Storage Tiers

An enterprise is planning to migrate its workloads to Microsoft Azure. The migration plan outlines three specific storage requirements:

1. An on-premises database will be hosted on an Azure Virtual Machine (IaaS). The database administrator must retain complete control over the database engine configuration and the operating system patching.
2. A legacy shared file share must be migrated to Azure to allow multiple virtual machines to access the files concurrently using the SMB protocol.
3. Approximately 200 TB200\text{ TB} of compliance logs must be retained for 7 years. These logs are rarely accessed but must be stored at the lowest possible cost, with an acceptable retrieval time of up to 14 hours.

To meet these requirements, the IT department designs a solution using Azure Managed Disks for the Virtual Machine, Azure Files (Cool tier) for the shared file share, and Azure Blob Storage (Archive tier) for the compliance logs.

After deployment, an administrator schedules a script that runs every month to read a random subset of the compliance logs directly from the Archive tier to verify data integrity.

Which of the following statements correctly evaluates this deployment and the administrator's script?

  1. The virtual machine and file share configurations are appropriate, but the integrity verification script will fail because data in the Archive tier is offline and cannot be read directly without first being rehydrated to an online tier.Answer
  2. B
    The entire solution is optimal, and the verification script will run successfully because Azure Blob Storage automatically provides immediate read access to Archive tier data for validation scripts.
  3. C
    The script will succeed, but the deployment violates the IaaS model because Microsoft is responsible for managing the operating system patching and database configurations on the database Virtual Machine.
  4. D
    The file share and VM configurations are correct, and the verification script will succeed because the Archive tier allows direct read access if the files are smaller than 10 MB10\text{ MB}, while Microsoft handles all VM operating system updates.

Answer

The virtual machine and file share configurations are appropriate, but the integrity verification script will fail because data in the Archive tier is offline and cannot be read directly without first being rehydrated to an online tier.
The configuration correctly identifies the division of responsibilities for IaaS VMs, where the customer maintains control over the OS patching and database engine configuration. Azure Files is suitable for concurrent SMB-based shares. However, the Archive storage tier of Azure Blob Storage is an offline tier. Data stored in this tier cannot be read directly. To read a blob in the Archive tier, it must first be rehydrated to an online tier (Hot, Cool, or Cold), which means the integrity verification script attempting direct reads will fail.

Step-by-Step Solution

1
Analyze the IaaS virtual machine configuration and responsibilities.
Under the Infrastructure as a Service (IaaS) model, the customer manages the operating system, middleware, database configuration, and patching. The proposed VM setup aligns with these requirements.
To verify if the database VM setup violates or conforms to the cloud service model responsibility boundaries.
2
Evaluate the file share protocol and storage requirements.
Azure Files supports concurrent SMB access and offers a Cool tier, which fits the migration requirements for a shared network folder.
To confirm that Azure Files is the correct service for SMB-based concurrent access.
3
Examine the compliance logs storage tier characteristics.
The Archive tier of Azure Blob Storage provides the lowest storage cost, but its data is offline. Direct access/read requests fail immediately.
To determine whether the administrator's script can read the compliance log samples directly.
4
Evaluate the recovery/access process for the Archive tier.
To read the data, the blobs must first be rehydrated to an online tier (Hot, Cool, or Cold), which takes up to 15 hours for standard priority. Thus, direct reads will fail.
To form the final conclusion that the script will fail because of the Archive tier offline state.

Key Concept

Azure Storage Account service types, storage tiers (Archive rehydration), and IaaS shared responsibility model.
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Topics

Azure Storage Accounts, Blob, Disk, Files, and Storage Tiers

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