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Azure Site Recovery

Protect Your Data Center with Microsoft Azure DR as a Service

Azure Site Recovery Cloud DR Solution

Azure Site Recovery simplifies disaster recovery by providing comprehensive protection for VMware®, Hyper-V® and physical servers in a single solution.

Using Azure as your primary recovery site also eliminates the need to manage and maintain a second data center, further reducing complexity and expense.

Orchestrate the protection and recovery of your applications for simplified disaster recovery:

Automated protection and replication of virtual machines
Remote health monitoring
Customizable recovery plans
No-impact recovery plan testing
Orchestrated recovery when needed
Replication to — and recovery in — Azure
Microsoft Silver Partner

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Disaster Recovery enabled with Azure Site Recovery

See How Microsoft Azure Site Recovery helps keep your applications running during planned and unplanned outages

Benefits of Azure Site Recovery

Ensure business continuity by keeping your applications running in Azure. Azure Site Recovery makes it simple for you to test disaster recovery by replicating applications between Azure regions.


 Change the cost of disaster recovery from CAPEX to OPEX, with little capital expenditure costs.


Comprehensive protection for VMware, Hyper-V and physical servers from a single management portal.


Policy-driven protection and replication of virtual and physical servers.


Only pay for low cost ‘blob’ storage until your servers are running in Azure.


Bring servers up in an orchestrated fashion to quickly restore complex multi-tier workloads.


 Data changes sent to Azure using streaming ‘asynchronous replication’ minimizing potential data loss.

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Infographic – Microsoft Azure Site Recovery

Azure Site Recovery simplifies disaster recovery by providing comprehensive protection for VMware®, Hyper-V® and physical servers in a single solution

Frequently Asked Questions (FAQs)

Using Azure as your primary recovery site eliminates the need to manage and maintain a second data center, further reducing complexity and expense.

What do I need for VMware VM disaster recovery?


Learn about the components involved in the disaster recovery of VMware VMs.

Can I use Site Recovery to migrate VMware VMs to Azure?


Yes, in addition to using Site Recovery to set up full disaster recovery for VMware VMs, you can also use Site Recovery to migrate on-premises VMware VMs to Azure. In this scenario, you replicate on-premises VMware VMs to Azure storage. Then, you fail over from on-premises to Azure. After failover, your apps and workloads are available and running on Azure VMs. The process is similar to setting up full disaster recovery, except that in a migration you can’t fail back from Azure.

Does my Azure account need permissions to create VMs?


If you’re a subscription administrator, you have the replication permissions you need. If you’re not, you need permissions to create an Azure VM in the resource group and virtual network you specify when you configure Site Recovery, and permissions to write to the selected storage account or managed disk based on your configuration. Learn more.

What applications can I replicate?


You can replicate any app or workload running on a VMware VM that complies with replication requirements.

  • Site Recovery provides support for application-aware replication so that apps can be failed over and failed back to an intelligent state.
  • Site Recovery integrates with Microsoft applications such as SharePoint, Exchange, Dynamics, SQL Server, and Active Directory, and works closely with leading vendors, including Oracle, SAP, IBM and Red Hat.
  • Learn more about workload protection.

Can I use a guest OS server license on Azure?


Yes, Microsoft Software Assurance customers can use Azure Hybrid Benefit to save on licensing costs for Windows Server machines that are migrated to Azure or to use Azure for disaster recovery.

What access does Site Recovery need to VMware servers?


Site Recovery needs access to VMware servers to:

  • Set up a VMware VM running the Site Recovery configuration server,
  • Automatically discover VMs for replication.

What access does Site Recovery need to VMware VMs?


  • In order to replicate, a VMware VM must have the Site Recovery Mobility service installed and running. You can deploy the tool manually, or specify that Site Recovery should do a push installation of the service when you enable replication for a VM.
  • During replication, VMs communicate with Site Recovery as follows:
    • VMs communicate with the configuration server on port HTTPS 443 for replication management.
    • VMs send replication data to the process server on port HTTPS 9443 (can be modified).
    • If you enable multi-VM consistency, VMs communicate with each other over port 20004.

Is replication data sent to Site Recovery?


No, Site Recovery doesn’t intercept replicated data and doesn’t have any information about what’s running on your VMs. Replication data is exchanged between VMware hypervisors and Azure storage. Site Recovery has no ability to intercept that data. Only the metadata needed to orchestrate replication and failover is sent to the Site Recovery service.

Site Recovery is ISO 27001:2013, 27018, HIPAA, DPA certified and is in the process of SOC2 and FedRAMP JAB assessments.

Where does Site Recovery replicate data to?


Site Recovery replicates on-premises VMware VMs and physical servers to managed disks in Azure.

  • The Site Recovery process server writes replication logs to a cache storage account in the target region.
  • These logs are used to create recovery points on Azure managed disks which have prefix of asrseeddisk.
  • When failover occurs, the recovery point you select is used to create a new target managed disk. This managed disk is attached to the VM in Azure.
  • VMs that were previously replicated to a storage account (prior to March 2019) aren’t affected.

What is asrseeddisk?


For every source disk, data is replicated to a Managed Disk in Azure. This disk has the prefix of asrseeddisk. It stores the copy of source disk and all the recovery point snapshots.

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