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

An organization is designing a disaster recovery (DR) solution from the Azure East US region to the West US region for a critical retail application. The application consists of two virtual machine tiers:

* Web Tier: Two virtual machines named `VM-Web1` and `VM-Web2` deployed on Standard_D2s_v5 size. Each VM has a single OS disk using Standard SSD storage, with a write churn rate of $1.2\text{ MB/s}$ per disk.
* Database Tier: A single virtual machine named `VM-DB1` running SQL Server on Standard_E8s_v5 size. The VM has one OS disk and one data disk ( $512\text{ GB}$ ) containing database files. Both disks use Standard SSD storage. The data disk has an average write churn rate of $14\text{ MB/s}$ .

The organization specifies a Recovery Point Objective (RPO) of 1 hour and a Recovery Time Objective (RTO) of 2 hours for the entire application.

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

Replicate `VM-Web1` and `VM-Web2` to the West US region by using Azure Site Recovery.Answer
Change the database data disk of `VM-DB1` to Premium SSD, and then replicate `VM-DB1` to the West US region by using Azure Site Recovery.Answer
C
Replicate `VM-DB1` to the West US region using Azure Site Recovery with its current Standard SSD data disk configuration.
D
Configure Read-Access Geo-Redundant Storage (RA-GRS) to replicate the virtual machine disks directly.
E
Replicate `VM-DB1` to the West US region by using Azure Backup with a 1-hour backup replication interval.

Answer

Replicate the web VMs using Azure Site Recovery, and upgrade the database data disk to Premium SSD before replicating the database VM using Azure Site Recovery.

The correct options recommend replicating the web tier VMs using Azure Site Recovery as-is, since their write churn (

1.2\text{ MB/s}

) is well within the

8\text{ MB/s}

limit for Standard SSD. For the database tier, the data disk's write churn (

14\text{ MB/s}

) exceeds the Standard SSD limit (

8\text{ MB/s}

), so it must be upgraded to Premium SSD (which supports up to

54\text{ MB/s}

of write churn) before configuring Azure Site Recovery.

Step-by-Step Solution

Evaluate the write churn of the web tier disks against Azure Site Recovery limits.

The web tier VMs have a write churn of

1.2\text{ MB/s}

on Standard SSD. Since the Azure Site Recovery limit for Standard SSD is

8\text{ MB/s}

, they can be replicated as-is.

To determine if the current storage configuration supports Azure Site Recovery replication for the web tier.

Evaluate the write churn of the database tier disks against Azure Site Recovery limits.

The database VM has a data disk write churn of

14\text{ MB/s}

on Standard SSD. This exceeds the Azure Site Recovery limit of

8\text{ MB/s}

for Standard SSD.

To identify replication bottlenecks or compatibility issues for the database tier.

Select the appropriate storage upgrade and replication strategy for the database tier.

Upgrading the database data disk to Premium SSD increases the Azure Site Recovery disk churn limit to

54\text{ MB/s}

, accommodating the

14\text{ MB/s}

write churn and enabling replication.

To meet the DR requirements while keeping the workload fully supported by Azure Site Recovery.

Key Concept

Azure Site Recovery VM replication disk write churn limits

Estimated Time:2m 0s

Question

Answer

Step-by-Step Solution

Key Concept

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