A retail company hosts a customer order processing system on Azure virtual machines in the… — Microsoft Azure Solutions Architect (AZ-305)

A retail company hosts a customer order processing system on Azure virtual machines in the East US region. The disaster recovery (DR) solution must replicate workloads to the West US region. The application architecture consists of:

- `vm-orderapp`: An application server with an OS disk and a data disk (both Premium SSD v1). The data disk experiences a write churn rate of $12\text{ MB/s}$ .
- `vm-orderdb`: A SQL Server database server with an OS disk and a data disk (both Premium SSD v1). The database transaction log data disk experiences a continuous write churn rate of $62\text{ MB/s}$ .

The company requires a Recovery Point Objective (RPO) of $2\text{ hours}$ for the application tier and $10\text{ seconds}$ for the database tier, with a Recovery Time Objective (RTO) of $1\text{ hour}$ for the entire solution.

Which two actions should you include in the disaster recovery design? (Select TWO.)

Replicate vm-orderapp to the West US region using Azure Site Recovery.Cevap
Configure SQL Server Always On Availability Groups to replicate the database from vm-orderdb to a SQL Server instance in the West US region.Cevap
C
Replicate vm-orderdb to the West US region using Azure Site Recovery.
D
Use Azure Backup Cross-Region Restore (CRR) to replicate both virtual machines to the West US region.

Cevap

To meet the design requirements, you must replicate the application server (vm-orderapp) using Azure Site Recovery and configure SQL Server Always On Availability Groups to replicate the database from the database server (vm-orderdb) to the target region.

Replicating the application server using Azure Site Recovery is correct because its disk write churn is within the

54\text{ MB/s}

threshold for Premium SSD v1, and the

2\text{ hour}

RPO is fully supported. Implementing SQL Server Always On Availability Groups is correct because the database server's disk write churn of

62\text{ MB/s}

exceeds the maximum per-disk limit of ASR, and ASR cannot guarantee the required

10\text{ second}

RPO.

Adım Adım Çözüm

Analyze the write churn rates against Azure Site Recovery limits.

The application server's write churn (

12\text{ MB/s}

) is below the

54\text{ MB/s}

limit per Premium SSD v1 disk. The database server's write churn (

62\text{ MB/s}

) exceeds the

54\text{ MB/s}

per-disk limit.

Azure Site Recovery enforces a hard limit of

54\text{ MB/s}

write churn per Premium SSD v1 disk for replication.

Evaluate replication capability for the recovery objectives.

The

2\text{ hour}

RPO for the application tier is fully supported by Azure Site Recovery. The

10\text{ second}

RPO for the database tier cannot be guaranteed by ASR, which replicates asynchronously with typical recovery points in minutes.

Database tier replication requires a native replication technique such as SQL Server Always On Availability Groups to achieve sub-minute RPO and handle high churn.

Select the appropriate hybrid replication strategy.

Map the application server to Azure Site Recovery and the database server to SQL Server Always On Availability Groups.

This configuration ensures all technical limits are respected and both RPO and RTO requirements are met.

Anahtar Kavram

Replication limits and capability constraints in Azure Site Recovery vs. native application/database replication.

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