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Azure Files is a fully managed, cloud-native file-share service within an Azure Storage account. It offers SMB- and NFS-based shares that behave like a local file system, making it perfect for “lift-and-shift” migrations of legacy applications and for containerized workloads requiring persistent, network-mounted storage.
The image explains the compatibility of Azure Storage Accounts with legacy applications for "lift and shift" migrations, featuring icons of a computer and cloud.
For containerized scenarios—such as Docker containers running in Azure—Azure Files can mount an SMB share into any container, giving applications a familiar file-system path for configuration, logs, or shared data.
The image illustrates the compatibility of Azure Storage Accounts with legacy applications and file systems, and includes icons for Docker and containers.

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Protocol Support

Azure Files provides two primary network file protocols:
  • SMB (Server Message Block)
    Fully compatible with Windows clients and supports Windows ACLs just as on-premises.
  • NFS (Network File System 4.1)
    Ideal for Linux and macOS workloads. Available only in Premium storage accounts within a virtual network.
NFS support requires a Premium storage account and VNet deployment.
SMB is available in both Standard and Premium tiers.
The image is a diagram explaining the compatibility of Azure Storage Accounts with file shares, highlighting support for SMB and NFS protocols, and noting that NFS requires a premium account.

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Capacity, Scale, and Quotas

FeatureLimit
Maximum share size100 TiB
Maximum individual file size1 TiB
Maximum concurrent connections2,000/share
To avoid unexpected costs and uncontrolled growth, configure share quotas to cap the total data stored.

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Uploading and Managing Files

You can add, retrieve, and organize files in an Azure Files share using:
MethodUse CaseSample Command / Action
Azure PortalQuick GUI-based creation and uploadClick Upload within the Azure Storage UI
PowerShellScript and automationNew-AzStorageShare; Get-AzStorageFileContent
AzCopyHigh-performance, large-scale movesazcopy copy ... --recursive
The image is a guide on uploading files to Azure Files using three methods: Azure Portal, PowerShell, and AzCopy, each with brief descriptions of their features.

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Example: Upload with AzCopy

azcopy copy "/local/path/*" \
  "https://<storage-account>.file.core.windows.net/<share-name>?<SAS-token>" \
  --recursive

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Azure File Sync

Azure File Sync extends your on-premises Windows file servers into Azure Files. Deploy the Azure File Sync agent, register your server with a Storage Sync Service, and create a sync group to connect local folders to an Azure file share. File changes replicate bidirectionally:
  • On-prem → Azure: New or modified files upload automatically.
  • Azure → On-prem: Updates propagate to all registered servers.
The image illustrates Azure File Sync, showing a cloud labeled "Azure File Share" connected to a server and a user with a laptop, indicating file synchronization with data centers.
Large-scale synchronization can incur data transfer charges and may impact network performance. Plan your cache settings and sync schedules to optimize costs and user experience.

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