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### YamlMime:ModuleUnit
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uid: learn.protect-infrastructure-with-azure-site-recovery.2-what-is-site-recovery
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metadata:
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title: What is Azure Site Recovery?
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description: Here, you'll learn how replication, disaster recovery (DR) drills, and the flexibility of Site Recovery.
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ms.date: 01/25/2025
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author: ankitaduttaMSFT
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ms.author: ankitadutta
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ms.topic: unit
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title: What is Azure Site Recovery
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durationInMinutes: 4
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content: |
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[!include[](includes/2-what-is-site-recovery.md)]
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### YamlMime:ModuleUnit
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uid: learn.protect-infrastructure-with-azure-site-recovery.2-what-is-site-recovery
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metadata:
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title: What is Azure Site Recovery?
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description: Here, you learn how replication, disaster recovery (DR) drills, and the flexibility of Site Recovery.
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ms.date: 01/25/2025
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author: ankitaduttaMSFT
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ms.author: ankitadutta
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ms.topic: unit
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title: What is Azure Site Recovery
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durationInMinutes: 4
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content: |
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[!include[](includes/2-what-is-site-recovery.md)]
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learn-pr/azure/protect-infrastructure-with-site-recovery/includes/1-introduction.md

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Azure Site Recovery provides disaster recovery for Azure infrastructure by managing and orchestrating replication, failover, and failback of Azure virtual machines (VMs).
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Assume you're working at a medical-care organization with multiple facilities across the country/region. Your organization has recently suffered an outage because of building damage in your data center from a hurricane. You want to move this infrastructure to Azure and take advantage of the replication and recovery features available there. You have several virtual machines running in Azure already, and now wish to configure protection for them to fail over to a secondary Azure region if there's a disaster.
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Assume you're working at a medical-care organization with multiple facilities across the country/region. Your organization recently suffered an outage because of building damage in your data center from a hurricane. You want to move this infrastructure to Azure and take advantage of the replication and recovery features available there. You have several virtual machines running in Azure already, and now wish to configure protection for them to fail over to a secondary Azure region if there's a disaster.
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In this module, you'll learn about **Azure Site Recovery** and explore the features that apply to a business continuity and disaster recovery (BCDR) plan.
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In this module, you learn about **Azure Site Recovery** and explore the features that apply to a business continuity and disaster recovery (BCDR) plan.
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## Learning objectives
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In this module, you'll:
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- Protect Azure VMs with Azure Site Recovery.
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- Run a disaster recovery drill to validate the protection.
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- Run a disaster recovery drill that validates the protection.
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- Failover and failback your virtual machines.
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## Prerequisites
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- Basic understanding of Azure virtual networking
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> [!NOTE]
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> For this module, you'll need to use your subscription to complete the optional exercises. This subscription can be a free trial subscription or one to which you already have access.
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> For this module, you need to use your subscription to complete the optional exercises. This subscription can be a free trial subscription or one to which you already have access.

learn-pr/azure/protect-infrastructure-with-site-recovery/includes/2-what-is-site-recovery.md

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Azure Site Recovery replicates your virtual-machine workloads between Azure regions. You can also use Site Recovery to migrate VMs from other environments—such as on-premises infrastructure—to Azure. You'll learn that Site Recovery does much more than just backing up and restoring infrastructure.
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Azure Site Recovery replicates your virtual-machine workloads between Azure regions. You can also use Site Recovery to migrate VMs from other environments—such as on-premises infrastructure—to Azure. In this unit, you learn that Site Recovery does a lot more than just backing up and restoring infrastructure.
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Let's assume your organization recently suffered an outage caused by a hurricane. Here, we'll learn about the Site Recovery features that help handle future interruptions. We'll also identify the Site Recovery features required to protect your Azure VMs by enabling failing over to a secondary Azure region.
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Let's assume your organization recently suffered an outage caused by a hurricane. Here, we learn about the Site Recovery features that help handle future interruptions. We also identify the Site Recovery features required to protect your Azure VMs by enabling failing over to a secondary Azure region.
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## Site Recovery features
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![Diagram showing a VM environment that is unavailable and failing over to a secondary environment.](../media/2-failover.png)
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![Diagram showing a virtual machine (VM) environment that is unavailable and failing over to a secondary environment.](../media/2-failover.png)
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Site Recovery manages disaster-recovery orchestration in Azure. It's designed to replicate workloads from a primary site or region to a secondary site. If the primary site has an issue, Site Recovery can replicate the protected VMs to another Azure region.
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Site Recovery manages disaster-recovery orchestration in Azure. It replicates workloads from a primary site or region to a secondary site. If the primary site has an issue, Site Recovery can replicate the protected VMs to another Azure region.
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Site Recovery manages replicating Azure VM between regions or replicating on-premises VMs to Azure and back again. Because it's built natively into Azure, Site Recovery can run seamless tests (disaster recovery drills) without affecting production workloads.
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Site Recovery manages the replicating of Azure VMs between regions or replicating on-premises VMs to Azure and back again. Site Recovery is built natively into Azure, so it can run seamless tests (disaster recovery drills) without affecting production workloads.
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### Azure virtual machine protection
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Site Recovery protects your VM instances in Azure automatically. Site Recovery mirrors the source VM configuration and creates required or associated resource groups, storage accounts, virtual networks, and availability sets to a secondary Azure region. The resources created are appended with a Site Recovery suffix.
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Site Recovery protects your virtual machine (VM) instances in Azure automatically. Site Recovery mirrors the source VM configuration and creates required or associated resource groups, storage accounts, virtual networks, and availability sets to a secondary Azure region. The resources created are appended with a Site Recovery suffix.
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### Snapshots and recovery points
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When you enable replication for an Azure VM, the Site Recovery mobility service is installed as an extension on the VM. The installed extension registers the VM with Site Recovery. Continuous replication of the VM then begins, with any writes to the disk immediately transferred to a local storage account. Site Recovery uses this account, replicating the cache to a storage account in the destination environment.
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Site Recovery copies data stored in the cache and syncs it with either the target storage account or replicated managed disks. After the data is processed, crash-consistent recovery points are created. If app-consistent recovery points are enabled, they'll be generated on a schedule as set in the Site Recovery replication policy.
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Site Recovery copies data stored in the cache and syncs it with either the target storage account or replicated managed disks. After the data is processed, crash-consistent recovery points are created. If app-consistent recovery points are enabled, they're generated on the schedule set in the Site Recovery replication policy.
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Site Recovery can use accelerated networking for Azure VMs, reducing jitter and CPU usage.
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### Disaster recovery drills
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Site Recovery enables you to do disaster recovery drills after all the prerequisite configuration tasks are complete. Running a DR drill allows you to validate the replication strategy for your environment without losing data, having downtime, or compromising your production environment. Drills don't affect your production environment and are a way to test that you've correctly configured everything.
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Site Recovery enables you to do disaster recovery (DR) drills after all the prerequisite configuration tasks are complete. Running a DR drill allows you to validate the replication strategy for your environment without losing data, having downtime, or compromising your production environment. Drills don't affect your production environment and are a way to test that you correctly configured everything.
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### Flexible failover and failback
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learn-pr/azure/protect-infrastructure-with-site-recovery/includes/3-site-recovery-setup.md

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In the previous unit, we explored the capabilities of Azure Site Recovery. Our next step is to prepare for disaster recovery in our Azure environment.
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Using our organization's business continuity and disaster recovery (BCDR) plan, we can run through the Site Recovery configurations and set a preparation plan in motion that fits with our organization's BCDR goals. Let's assume we're using the West US Azure region for our existing solution, and we've decided to use the East US region for replication.
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Using our organization's business continuity and disaster recovery (BCDR) plan, we can run through the Site Recovery configurations and set a preparation plan in motion that fits with our organization's BCDR goals. Let's assume we're using the West US Azure region for our existing solution, and we decided to use the East US region for replication.
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Here, we'll explore how to take advantage of the automated features in Site Recovery to prepare for a disaster-recovery scenario.
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Here, we explore how to take advantage of the automated features in Site Recovery to prepare for a disaster-recovery scenario.
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## Environment setup
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We need to set up our environment for exercises in subsequent units. Because this setup takes a few minutes to complete, we'll start the process now, and then we can work through some of the theory while the configuration completes in the background.
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We need to set up our environment for exercises in subsequent units. Because this setup takes a few minutes to complete, let's start the process now, and then we can work through some of the theory while the configuration completes in the background.
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> [!NOTE]
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> If you want to complete the following setup, but you don't have an Azure subscription or prefer not to use your account, you'll need to create a [free account](https://azure.microsoft.com/free/?azure-portal=true) before you begin.
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> If you want to complete the following setup, but you don't have an Azure subscription or prefer not to use your account, you need to create a [free account](https://azure.microsoft.com/free/?azure-portal=true) before you begin.
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Let's assume we have two VMs configured in the organization. We'll configure the following services in the West US region to simulate the configured VMs.
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Let's assume we have two virtual machines (VMs) configured in the organization. We'll configure the following services in the West US region to simulate the configured VMs.
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- A virtual network
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- Two VMs
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- A storage account
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We'll also configure a resource group in East US. We'll later configure Site Recovery to use the East US region as our target environment.
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Our first step is to create our exercise environment. We'll run a script that creates our company's infrastructure in Azure. After the script completes, we'll have a virtual network, two VMs, and a storage account that we'll use for our Recovery Services vault.
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Our first step is to create our exercise environment. We'll run a script that creates our company's infrastructure in Azure. After the script completes, we'll have a virtual network, two VMs, and a storage account that we'll use for our Recovery Services vault.
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1. Sign in to the [Azure portal](https://portal.azure.com) with your credentials, and start a Cloud Shell session.
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## Disaster recovery preparation with Azure Site Recovery
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Site Recovery manages and orchestrates our DR process for Azure VMs or on-premises machines. However, to enable it, there are several components we need to configure. We'll need to:
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Site Recovery manages and orchestrates our disaster recovery (DR) process for Azure VMs or on-premises machines. However, to enable it, there are several components to configure. We need to:
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- Add a Recovery Services vault
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- Organize target resources
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- Configure outbound network connectivity
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- Set up replication on existing VMs
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:::image type="content" source="../media/3-enable-replication-step-2.png" alt-text="Diagram showing how Azure Site Recovery keeps an updated version of VM disks to enable replication from a source region to a target region." border="false":::
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:::image type="content" source="../media/3-enable-replication-step-2.png" alt-text="Diagram showing how Azure Site Recovery keeps an updated version of virtual machine (VM) disks to enable replication from a source region to a target region." border="false":::
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### What is a Recovery Services vault?
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A Recovery Services vault enables Site Recovery to complete disaster recovery replication. These vaults use storage accounts to store data backups, VM configuration settings, and workloads. To meet Site Recovery requirements, we'll provision a Recovery Services vault using the portal or the Azure CLI.
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A Recovery Services vault enables Site Recovery to complete disaster recovery replication. These vaults use storage accounts to store data backups, VM configuration settings, and workloads. To meet Site Recovery requirements, we need to provision a Recovery Services vault using the portal or the Azure CLI.
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### What are the target resources?
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The required network connectivity is set up for you automatically when using VMs created in Azure. However, when you migrate on-premises VMs to Azure, you might need to update your network connectivity.
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Site Recovery doesn't support controlling network connectivity via an authentication proxy. If your organization is using a URL-based firewall proxy to restrict outbound connectivity, you'll need to add access to several URLs.
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Site Recovery doesn't support controlling network connectivity via an authentication proxy. If your organization is using a URL-based firewall proxy to restrict outbound connectivity, you need to add access to several URLs.
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| *.hypervrecoverymanager.windowsazure.com | For Site Recovery to communicate with the VM |
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If you prefer to control the connectivity using IP addresses instead, you'll need to add the IP address ranges for:
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If you prefer to control the connectivity using IP addresses instead, you need to add the IP address ranges for:
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Every Azure VM you want to replicate has to register with Site Recovery. For a VM to register, Site Recovery requires the latest root certificates installed on the VM. On a Windows VM, you'll need to make sure to install all the latest Windows updates. The process for updating root certificates on Linux VMs varies from distribution to distribution. You'll need to follow the guidance the distributor publishes.
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Every Azure VM you want to replicate has to register with Site Recovery. For a VM to register, Site Recovery requires the latest root certificates installed on the VM. On a Windows VM, you need to make sure to install all the latest Windows updates. The process for updating root certificates on Linux VMs varies from distribution to distribution, so you need to follow the guidance the distributor publishes.
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### What is Azure Mobility Service?
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Azure Mobility Service needs to be installed on every VM that you replicate. This client is available for Windows and Linux VMs, and will be installed and configured automatically by Site Recovery. If the automatic installation fails, you can install the service manually.
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Azure Mobility Service needs to be installed on every VM that you replicate. This client is available for Windows and Linux VMs, and Site Recovery installs and configures it automatically. If the automatic installation fails, you can install the service manually.
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The mobility service works in partnership with Site Recovery to keep an up-to-date cache of the VMs' data. The cache is replicated to the target environment's storage account. The replicated data is used if Site Recovery fails over the environment.

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