You are designing a disaster recovery solution to Azure for an on-premises VMware virtual … — Microsoft Azure Solutions Architect (AZ-305)

You are designing a disaster recovery solution to Azure for an on-premises VMware virtual machine that hosts a financial database. The source environment has a $10\text{ Gbps}$ ExpressRoute connection to Azure.

The virtual machine has the following specifications:
- Operating system disk: $80\text{ GB}$ size, $4\text{ MB/s}$ average write churn
- Database log disk: $500\text{ GB}$ size, $35\text{ MB/s}$ average write churn
- Recovery Point Objective (RPO) goal: $15\text{ minutes}$
- Recovery Time Objective (RTO) goal: $4\text{ hours}$

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

Replicate the operating system disk to Azure by using Azure Site Recovery.Answer
B
Replicate the database log disk to Azure by using Azure Site Recovery.
Exclude the database log disk from Azure Site Recovery replication and protect the database workload by using SQL Server native replication.Answer
D
Configure Azure Backup with Cross-Region Restore to protect the entire virtual machine with a $15\text{ minutes}$ RPO.

Answer

The correct actions are to replicate the operating system disk to Azure by using Azure Site Recovery, and to exclude the database log disk from Azure Site Recovery replication while using SQL Server native replication to protect the database workload.

Replicating the operating system disk via Azure Site Recovery is supported because its write churn of

4\text{ MB/s}

is below the

10\text{ MB/s}

limit. Excluding the database log disk and using SQL Server native replication is required because the database log disk's write churn of

35\text{ MB/s}

exceeds the supported replication limits of Azure Site Recovery.

Step-by-Step Solution

Analyze the write churn of each disk on the source virtual machine.

The operating system disk has a write churn of

4\text{ MB/s}

, and the database log disk has a write churn of

35\text{ MB/s}

Identifying individual disk churn rates is necessary to check them against Azure Site Recovery limits.

Compare the disk churn rates against the Azure Site Recovery limits for on-premises VMware virtual machines.

The operating system disk churn (

4\text{ MB/s}

) is below the

10\text{ MB/s}

limit, while the database log disk churn (

35\text{ MB/s}

) exceeds the

10\text{ MB/s}

limit.

Azure Site Recovery replication will fail if a disk's write churn exceeds its supported threshold.

Design the disaster recovery replication strategy for the workload.

Use Azure Site Recovery to replicate the supported operating system disk, exclude the high-churn database log disk, and configure SQL Server native replication at the application layer to protect the database database files and log files.

This hybrid approach avoids Azure Site Recovery limits while ensuring all parts of the VM are protected within the

15\text{ minutes}

RPO.

Key Concept

Azure Site Recovery write churn limits and alternative replication strategies for high-churn database workloads.

Estimated Time:1m 0s

Question

Answer

Step-by-Step Solution

Key Concept

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