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Demystifying Azure Site Recovery

Joseph Landes
Joseph LandesChief Revenue Officer
0 commentsJune 27, 2019Articles

One of the most common questions we get from MSPs who are in the process of building a cloud practice in Microsoft Azure is “what is Azure Site Recovery (ASR) and when should I use it?” 

Let’s review this important Azure service from Microsoft and its relevance to MSPs.  

Why does ASR exist? 

Azure Site Recovery (ASR) is Microsoft’s Disaster Recovery-as-a-Service (DRaaS) solution built specifically for Azure workloads. ASR enables companies to recover from catastrophes quickly with minimal downtime. ASR can also be used as a tool to migrate existing servers into Azure from an on-premises environment or migrate workloads between Azure regions and resource groups. 

Who is ASR designed for? 

  • Companies that need to meet specific requirements or regulations for their industry such as ISO 27001 
  • Companies who are sensitive to downtime or want to limit impact from region-specific Azure outages 
  • Companies who wish to migrate current workloads into Azure from an on-premises environment, between Azure regions, or between resource groups 
  • Anyone seeking a complete business continuity and disaster recovery (BCDR) strategy for their business 

When can ASR be used? 

  • Replication of Azure VMs from one Azure region to another 
  • Replication of on-premises VMware VMs, Hyper-V VMs, physical Windows and Linux servers, and Azure Stack VMs to Azure 
  • Replication of on-premises VMware VMs, Hyper-V VMs managed by System Center VMM, and physical servers to a secondary site. 
  • Replication of specific workloads running on a machine that’s supported for replication 

What are some of the key features of ASR? 

  • A simple BCDR solution – ASR is built into Azure and can be managed entirely from within a single location
  • Data Resilience - Data is replicated inside of Azure storage with all the resilience and security provided by Azure
  • RTO and RPO Targets – Manage and meet organizational RTO/RPO targets with continuous replication at intervals as low as 30 seconds for Hyper-V servers
  • Easy and Flexible Failover– Test failover and disaster recovery scenarios without disrupting replication
    • Failovers can also be planned for expected outages with zero-data loss
    • Unplanned failovers can happen with minimal data loss and fail back to your primary site can be done easily when it’s available again 

How do I setup a basic ASR replication?  

  • Log into your Azure tenant  

Enable replication for an Azure VM  

  • In the Azure portal, click Virtual machines, and select the VM you want to replicate 
  • In Operations, click Disaster recovery 
  • In Configure disaster recovery > Target region select the target region to which you'll replicate 
  • For this QuickStart, accept the other default settings 
  • Click Enable replication. This starts a job to enable replication for the VM

Verify your settings  

  • After the replication job has finished, you can check the replication status, modify replication settings, and test the deployment 
    • In the VM menu, click Disaster recovery
    • You can verify replication health, the recovery points that have been created, source, and target regions on the map

Clean up resources/stop replication  

  • The VM in the primary region stops replicating when you disable replication for it:  
    • The source replication settings are cleaned up automatically. The Site Recovery extension installed on the VM as part of the replication isn't removed and must be removed manually. 
    • Site Recovery billing for the VM stops

Stop replication as follows 

  • Select the VM 
  • In Disaster recovery, click Disable Replication

Where can I get more information? 

  • You can learn more about ASR including Pricing details here 
  • Resources for planning a deployment can be found:  
  • More information including tutorials for deployment can be found here 
  • Use ASR to migrate a VM to Azure. Click here for our guide.
  • An entire article dedicated to Azure fundamentals, terminology, hierarchy, and resources can be found here

 

 

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