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Copy file name to clipboardExpand all lines: articles/storage/files/storage-files-migration-overview.md
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@@ -4,7 +4,7 @@ description: Learn how to migrate to Azure file shares and find your migration g
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author: khdownie
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ms.service: azure-file-storage
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ms.topic: conceptual
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ms.date: 07/13/2023
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ms.date: 10/30/2023
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ms.author: kendownie
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---
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@@ -48,7 +48,7 @@ Unlike object storage in Azure blobs, an Azure file share can natively store fil
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> [!IMPORTANT]
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> If you're migrating on-premises file servers to Azure File Sync, set the ACLs for the root directory of the file share **before** copying a large number of files, as changes to permissions for root ACLs can take up to a day to propagate if done after a large file migration.
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A user of Active Directory, which is their on-premises domain controller, can natively access an Azure file share. So can a user of Microsoft Entra Domain Services. Each uses their current identity to get access based on share permissions and on file and folder ACLs. This behavior is similar to a user connecting to an on-premises file share.
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Users that leverage Active Directory Domain Services (AD DS) as their on-premises domain controller can natively access an Azure file share. So can users of Microsoft Entra Domain Services. Each uses their current identity to get access based on share permissions and on file and folder ACLs. This behavior is similar to a user connecting to an on-premises file share.
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The alternative data stream is the primary aspect of file fidelity that currently can't be stored on a file in an Azure file share. It's preserved on-premises when Azure File Sync is used.
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### File-copy tools
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There are several file-copy tools available from Microsoft and others. To select the right tool for your migration scenario, you must consider these fundamental questions:
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There are several file-copy tools available from Microsoft and others. To select the right tool for your migration scenario, consider these fundamental questions:
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* Does the tool support the source and target locations for your file copy?
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The first time you run the tool, it copies the bulk of the data. This initial run might last a while. It often lasts longer than you want for taking the data source offline for your business processes.
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By mirroring a source to a target (as with **robocopy /MIR**), you can run the tool again on that same source and target. The run is much faster because it needs to transport only source changes that occur after the previous run. Rerunning a copy tool this way can reduce downtime significantly.
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By mirroring a source to a target (as with **robocopy /MIR**), you can run the tool again on that same source and target. This second run is much faster because it needs to transport only source changes that happened after the previous run. Rerunning a copy tool this way can reduce downtime significantly.
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The following table classifies Microsoft tools and their current suitability for Azure file shares:
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| Recommended | Tool | Support for Azure file shares | Preservation of file fidelity |
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| :-: | :-- | :---- | :---- |
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|| RoboCopy | Supported. Azure file shares can be mounted as network drives. | Full fidelity.*|
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|| Azure File Sync | Natively integrated into Azure file shares. | Full fidelity.*|
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||[Azure File Migration Program](../solution-integration/validated-partners/data-management/azure-file-migration-program-solutions.md)| Supported. | Full fidelity.*|
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||[Azure Storage Migration Program](../solution-integration/validated-partners/data-management/azure-file-migration-program-solutions.md)| Supported. | Full fidelity.*|
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|| Storage Migration Service | Indirectly supported. Azure file shares can be mounted as network drives on SMS target servers. | Full fidelity.*|
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|| Data Box (including the [data copy service](../../databox/data-box-deploy-copy-data-via-copy-service.md) to load files onto the device)| Supported. </br>(Data Box Disks does not support large file shares) | Data Box and Data Box Heavy fully support metadata. </br>Data Box Disks does not preserve file metadata. |
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|| Data Box (including the [data copy service](../../databox/data-box-deploy-copy-data-via-copy-service.md) to load files onto the device)| Supported. </br>(Data Box Disks doesn't support large file shares) | Data Box and Data Box Heavy fully support metadata. </br>Data Box Disks does not preserve file metadata. |
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|| AzCopy </br>latest version | Supported but not fully recommended. | Doesn't support differential copies at scale, and some file fidelity might be lost. </br>[Learn how to use AzCopy with Azure file shares](../common/storage-use-azcopy-files.md)|
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|| Azure Storage Explorer </br>latest version | Supported but not recommended. | Loses most file fidelity, like ACLs. Supports timestamps. |
*\* Full fidelity: meets or exceeds Azure file-share capabilities.*
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*\* Full fidelity: meets or exceeds Azure fileshare capabilities.*
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### Migration helper tools
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This section describes tools that help you plan and run migrations.
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#### RoboCopy from Microsoft Corporation
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#### RoboCopy
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RoboCopy is one of the tools most applicable to file migrations. It comes as part of Windows. The main [RoboCopy documentation](/windows-server/administration/windows-commands/robocopy) is a helpful resource for this tool's many options.
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Included in Windows, RoboCopy is one of the tools most applicable to file migrations. The main [RoboCopy documentation](/windows-server/administration/windows-commands/robocopy) is a helpful resource for this tool's many options.
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#### Azure Storage Migration Program
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Understanding your data is the first step in selecting the appropriate Azure storage service and migration strategy. Azure Storage Migration Program provides different tools that can analyze your data and storage infrastructure to provide valuable insights. These tools can help you understand the size and type of data, file and folder count, and access patterns. They provide a consolidated view of your data and enable the creation of various customized reports.
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This information can help:
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- Identify duplicate and redundant data sets
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- Identify colder data that can be moved to less expensive storage
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To learn more, see [Comparison Matrix for Azure Storage Migration Program participants](../solution-integration/validated-partners/data-management/azure-file-migration-program-solutions.md).
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#### TreeSize from JAM Software GmbH
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## Next steps
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1. Create a plan for which deployment of Azure file shares (cloud-only or hybrid) you want.
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1. Review the list of available migration guides to find the detailed guide that matches your source and deployment of Azure file shares.
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1. Review the list of available migration guides to find the guide that matches your source and deployment of Azure file shares.
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More information about the Azure Files technologies mentioned in this article:
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