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Difficulty: EasyDesign Azure Site Recovery Solutions

An organization needs to design a disaster recovery solution to the Azure East US region for an on-premises VMware virtual machine named `SQL-VM1`. The VM has an OS disk and a single Premium SSD data disk. The write churn on the data disk is 8 MB/s8 \text{ MB/s}, and the total write churn for the entire VM is 10 MB/s10 \text{ MB/s}. The solution must achieve a Recovery Point Objective (RPO) of 15 minutes and a Recovery Time Objective (RTO) of 1 hour. Which replication solution should you design to meet these requirements?

  1. Azure Site Recovery replicationAnswer
  2. B
    Azure Backup vault-tier replication with instant restore
  3. C
    Read-Access Geo-Redundant Storage (RA-GRS) with active-active secondary write replication
  4. D
    Azure SQL Database auto-failover groups configured at the VM disk level

Answer

Azure Site Recovery replication
The correct option is Azure Site Recovery replication because the VM's disk write churn (8 MB/s8 \text{ MB/s}) and total VM write churn (10 MB/s10 \text{ MB/s}) are well below the Azure Site Recovery limit of 20 MB/s20 \text{ MB/s} per disk and 54 MB/s54 \text{ MB/s} per VM. ASR supports near-continuous replication, making it the ideal choice to meet the 15-minute RPO and 1-hour RTO.

Step-by-Step Solution

1
Identify the source environment and requirements.
The workload is an on-premises VMware VM requiring replication to Azure East US with an RPO of 15 minutes and RTO of 1 hour.
To select the appropriate disaster recovery service based on source type and performance metrics.
2
Evaluate the disk metrics against Azure Site Recovery limits.
The VM's single data disk churn is 8 MB/s8 \text{ MB/s} and total VM churn is 10 MB/s10 \text{ MB/s}.
Azure Site Recovery standard replication supports up to 20 MB/s20 \text{ MB/s} per disk and 54 MB/s54 \text{ MB/s} total VM churn, confirming ASR is compatible with this workload.
3
Compare candidate services against RPO/RTO targets.
Azure Site Recovery provides continuous replication capable of meeting sub-hour RTO and low RPO targets, unlike backup-centric options.
To ensure the chosen solution satisfies both service limits and business recovery objectives.

Key Concept

Selecting Azure Site Recovery for workloads meeting supported disk churn limits and disaster recovery targets
Estimated Time:1m 0s
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Topics

Design Azure Site Recovery Solutions

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