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 runs a retail inventory database. The solution must use Azure Site Recovery to meet a Recovery Point Objective (RPO) of $15\text{ minutes}$ and a Recovery Time Objective (RTO) of $1\text{ hour}$ . The virtual machine has the following disk configuration:

* Disk 1 (OS): $127\text{ GB}$ size, with a peak write churn of $3\text{ MB/s}$
* Disk 2 (Data): $1\text{ TB}$ size, with a peak write churn of $14\text{ MB/s}$

You need to recommend the target Azure managed disk configuration for replication while minimizing ongoing storage costs. Which configuration should you recommend?

Replicate Disk 1 to a Standard SSD managed disk and Disk 2 to a Premium SSD managed disk.Answer
B
Replicate both Disk 1 and Disk 2 to Standard SSD managed disks.
C
Replicate both Disk 1 and Disk 2 to Premium SSD managed disks.
D
Replicate Disk 1 to a Standard SSD managed disk and exclude Disk 2 from replication.

Answer

Replicate Disk 1 to a Standard SSD managed disk and Disk 2 to a Premium SSD managed disk.

The correct configuration is to replicate Disk 1 to a Standard SSD managed disk and Disk 2 to a Premium SSD managed disk. In Azure Site Recovery replication from VMware to Azure, the maximum supported write churn per disk is

10\text{ MB/s}

for Standard SSD and

25\text{ MB/s}

for Premium SSD. Disk 1's peak write churn is

3\text{ MB/s}

, which is within the Standard SSD limit and minimizes costs. Disk 2's peak write churn is

14\text{ MB/s}

, which exceeds the Standard SSD limit and therefore requires a Premium SSD target.

Step-by-Step Solution

Analyze the peak write churn for each disk against Azure Site Recovery limits for VMware to Azure replication.

Disk 1 has a peak churn of

3\text{ MB/s}

(below the

10\text{ MB/s}

Standard SSD limit). Disk 2 has a peak churn of

14\text{ MB/s}

(above the

10\text{ MB/s}

Standard SSD limit but below the

25\text{ MB/s}

Premium SSD limit).

To identify which Azure managed disk types are technically capable of handling the write churn without replication lag or failure.

Apply the cost minimization constraint to the compatible disk types.

Disk 1 should be mapped to the lowest-cost capable disk type, which is Standard SSD. Disk 2 must be mapped to Premium SSD because Standard SSD cannot support its write churn.

To satisfy the requirement of minimizing ongoing storage costs while maintaining supported configurations.

Key Concept

Azure Site Recovery write churn limits for VMware to Azure replication require mapping target disk types based on peak write rate limits (

10\text{ MB/s}

for Standard HDD/SSD, and

25\text{ MB/s}

for Premium SSD per disk).

Question

Answer

Step-by-Step Solution

Key Concept

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