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Copy file name to clipboardExpand all lines: articles/migrate/concepts-vmware-agentless-migration.md
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ms.manager: vijain
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ms.topic: concept-article
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ms.service: azure-migrate
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ms.date: 02/03/2025
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ms.date: 05/12/2025
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ms.custom: vmware-scenario-422, engagement-fy24
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# Agentless migration architecture
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The agentless replication option works by using VMware snapshots and VMware changed block tracking (CBT) technology to replicate data from virtual machine disks. The following block diagram shows you various steps involved when you migrate your virtual machines using the Migration and modernization tool.
When replication is configured for a virtual machine, it first goes through an initial replication phase. During initial replication, a VM snapshot is taken, and a full copy of data from the snapshot disks is replicated to managed disks in your target subscription.
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Azure Migrate supports concurrent replication of 500 virtual machines. When you're planning to replicate more than 300 virtual machines, you must deploy a scale-out appliance. The scale-out appliance is similar to an Azure Migrate primary appliance but consists only of gateway agent to facilitate data transfer to Azure. The following diagram shows the recommended way to use the scale-out appliance.
You can deploy the scale-out appliance anytime after configuring the primary appliance, but isn't required until there are 300 VMs replicating concurrently. When there are 300 VMs replicating concurrently, you must deploy the scale-out appliance to proceed.
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> [!NOTE]
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> This is applicable to all the replicating VMs from the Azure Migrate appliance simultaneously.
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You can also increase and decrease replication bandwidth based on a schedule using the [sample script](../common-questions-server-migration.md).
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You can also increase and decrease replication bandwidth based on a schedule using the [sample script](common-questions-server-migration.md).
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ms.manager: kmadnani
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ms.service: azure-migrate
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ms.topic: how-to
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ms.date: 08/20/2024
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ms.date: 05/09/2025
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ms.custom: vmware-scenario-422, engagement-fy23
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# Scale migration of VMware VMs
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This article helps you understand how to use scripts to migrate large number of VMware virtual machines (VMs) using the agentless method. To scale migrations, you use [Azure Migrate PowerShell module](./tutorial-migrate-vmware-powershell.md).
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This article helps you understand how to use scripts to migrate large number of VMware virtual machines (VMs) using the agentless method. To scale migrations, you use [Azure Migrate PowerShell module](tutorial-migrate-vmware-powershell.md).
The Azure Migrate VMware migration automation scripts are available for download in the [Azure PowerShell Samples](https://github.com/Azure/azure-docs-powershell-samples/tree/master/azure-migrate/migrate-at-scale-vmware-agentles) repo on GitHub. The scripts can be used to migrate VMware VMs to Azure using the agentless migration method. The Azure Migrate PowerShell commands used in these scripts are documented [here](./tutorial-migrate-vmware-powershell.md).
# Migrate VMware VMs to Azure VMs enabled with server-side encryption and customer-managed keys
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This article describes how to migrate VMware VMs to Azure virtual machines with disks encrypted using server-side encryption(SSE) with customer-managed keys(CMK), using Migration and modernization (agentless replication).
The Migration and modernization portal experience lets you [migrate VMware VMs to Azure with agentless replication.](tutorial-migrate-vmware.md) The portal experience supports DES/CMK. DES should be created before starting replication and must be provided while starting replication. It cannot be provided at the time of migration. In this article, you'll see how to create and deploy an [Azure Resource Manager template](../../azure-resource-manager/templates/overview.md) to replicate a VMware VM and configure the replicated disks in Azure to use SSE with CMK.
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The Migration and modernization portal experience lets you [migrate VMware VMs to Azure with agentless replication.](tutorial-migrate-vmware.md) The portal experience supports DES/CMK. DES should be created before starting replication and must be provided while starting replication. It cannot be provided at the time of migration. In this article, you'll see how to create and deploy an [Azure Resource Manager template](../azure-resource-manager/templates/overview.md) to replicate a VMware VM and configure the replicated disks in Azure to use SSE with CMK.
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The examples in this article use [Azure PowerShell](/powershell/azure/new-azureps-module-az) to perform the tasks needed to create and deploy the Resource Manager template.
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## Prerequisites
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-[Review the tutorial](tutorial-migrate-vmware.md) on migration of VMware VMs to Azure with agentless replication to understand tool requirements.
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-[Follow these instructions](../create-manage-projects.md) to create an Azure Migrate project and add the **Migration and modernization** tool to the project.
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-[Follow these instructions](create-manage-projects.md) to create an Azure Migrate project and add the **Migration and modernization** tool to the project.
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-[Follow these instructions](how-to-set-up-appliance-vmware.md) to set up the Azure Migrate appliance for VMware in your on-premises environment and complete discovery.
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## Prepare for replication
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## Set up replication
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You can now deploy the edited Resource Manager template to the project resource group to set up replication for the VM. Learn how to [deploy resource with Azure Resource Manager templates and Azure PowerShell](../../azure-resource-manager/templates/deploy-powershell.md)
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You can now deploy the edited Resource Manager template to the project resource group to set up replication for the VM. Learn how to [deploy resource with Azure Resource Manager templates and Azure PowerShell](../azure-resource-manager/templates/deploy-powershell.md)
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