An organization is designing a disaster recovery (DR) solution from the East US region to … — Microsoft Azure Solutions Architect (AZ-305)

An organization is designing a disaster recovery (DR) solution from the East US region to the West US region for a database workload hosted on an Azure virtual machine named VM2. The disaster recovery requirements specify a Recovery Point Objective (RPO) of $15$ minutes and a Recovery Time Objective (RTO) of $1$ hour.

VM2 is configured with three Premium SSD v1 disks as detailed in the following table:

Disk	Content	Write Churn
Disk 1	Operating System	$2\text{ MB/s}$
Disk 2	User Databases	$12\text{ MB/s}$
Disk 3	TempDB	$25\text{ MB/s}$

Which two actions should you include in the Azure Site Recovery (ASR) design to ensure replication is successful and meets the workload requirements?

Configure Azure Site Recovery to exclude the TempDB disk (Disk 3) from replication.Answer
Configure the replication policy for VM2 to use the High Churn tier.Answer
C
Replicate all three disks using the default standard replication policy.
D
Replicate Disk 3 by changing its storage tier to Standard HDD.

Answer

To design a successful replication strategy using Azure Site Recovery, you must configure Azure Site Recovery to exclude the TempDB disk (Disk 3) from replication and configure the replication policy for the virtual machine to use the High Churn tier.

Excluding the TempDB disk (Disk 3) from replication is the correct approach because TempDB contains temporary data that is recreated when SQL Server starts, and its write churn of

25\text{ MB/s}

exceeds the maximum supported limit (

20\text{ MB/s}

) for Azure Site Recovery. Enabling the High Churn replication policy is also required because Disk 2 has a write churn of

12\text{ MB/s}

, which exceeds the standard limit of

10\text{ MB/s}

but is supported under the High Churn policy tier.

Step-by-Step Solution

Analyze the write churn for each disk against Azure Site Recovery limits.

Disk 1 (

2\text{ MB/s}

) is within standard limits. Disk 2 (

12\text{ MB/s}

) exceeds the standard limit of

10\text{ MB/s}

but is within the high churn limit of

20\text{ MB/s}

. Disk 3 (

25\text{ MB/s}

) exceeds the high churn limit of

20\text{ MB/s}

This identifies which disks require special handling or policies due to exceeding replication thresholds.

Determine if any disk contents can be excluded from replication.

Disk 3 contains TempDB, which is non-persistent and recreated when the SQL Server service starts on the failover VM.

Excluding TempDB reduces replication bandwidth and removes a disk that violates the absolute ASR write churn limits.

Select the appropriate replication policy for the remaining disks.

Since Disk 2 has a churn rate of

12\text{ MB/s}

(exceeding standard limits), configuring the replication policy to use the High Churn tier is necessary to successfully replicate the VM.

Assigning the High Churn policy ensures that Disk 2 can replicate to the target region without failing due to rate limits.

Key Concept

Azure Site Recovery VM replication limits, High Churn policy support, and disk exclusion strategies for temporary data workloads.

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