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Copy file name to clipboardExpand all lines: articles/storage/files/files-nfs-protocol.md
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> [!IMPORTANT]
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> NFS Azure file shares aren't supported for Windows. Before using NFS Azure file shares in production, see [Troubleshoot NFS Azure file shares](/troubleshoot/azure/azure-storage/files-troubleshoot-linux-nfs?toc=/azure/storage/files/toc.json) for a list of known issues. NFS access control lists (ACLs) aren't supported.
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## Applies to
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| Management model | Billing model | Media tier | Redundancy | SMB | NFS |
NFS file shares are often used in the following scenarios:
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| Subdirectory mounts| ✔️ |
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|[Grant network access to specific Azure virtual networks](storage-files-networking-endpoints.md#restrict-access-to-the-public-endpoint-to-specific-virtual-networks)| ✔️ |
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|[Grant network access to specific IP addresses](../common/storage-network-security.md?toc=/azure/storage/files/toc.json#grant-access-from-an-internet-ip-range)| ⛔ |
| Access same data from Windows and Linux client| ⛔ |
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## Regional availability
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NFS Azure file shares are supported in all the same regions that support premium file storage. See [Azure products available by region](https://azure.microsoft.com/explore/global-infrastructure/products-by-region/?products=storage®ions=all).
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NFS Azure file shares are supported in all regions that support SSD file shares. See [Azure products available by region](https://azure.microsoft.com/explore/global-infrastructure/products-by-region/?products=storage®ions=all).
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## Performance
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NFS Azure file shares are only offered on premium file shares, which store data on solid-state drives (SSD). The IOPS and throughput of NFS shares scale with the provisioned capacity. See the [provisioned v1 model](understanding-billing.md#provisioned-v1-model) section of the **Understanding billing** article to understand the formulas for IOPS, IO bursting, and throughput. The average IO latencies are low-single-digit-millisecond for small IO size, while average metadata latencies are high-single-digit-millisecond. Metadata heavy operations such as untar and workloads like WordPress might face additional latencies due to the high number of open and close operations.
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NFS Azure file shares are only offered on SSD file shares, which store data on solid-state drives (SSD). The IOPS and throughput of NFS shares scale with the provisioned capacity. See the [provisioned v1 model](understanding-billing.md#provisioned-v1-model) section of the **Understanding billing** article to understand the formulas for IOPS, IO bursting, and throughput. The average IO latencies are low-single-digit-millisecond for small IO size, while average metadata latencies are high-single-digit-millisecond. Metadata heavy operations such as untar and workloads like WordPress might face additional latencies due to the high number of open and close operations.
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> [!NOTE]
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> You can use the `nconnect` Linux mount option to improve performance for NFS Azure file shares at scale. For more information, see [Improve NFS Azure file share performance](nfs-performance.md).
Copy file name to clipboardExpand all lines: articles/storage/files/files-redundancy.md
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When you create a storage account, you choose a redundancy setting for the storage account that's shared for all storage services exposed by that account. Therefore, all file shares deployed in the same storage account have the same redundancy setting. You might want to isolate file shares in separate storage accounts if they have different redundancy requirements.
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## Applies to
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| Management model | Billing model | Media tier | Redundancy | SMB | NFS |
Data in an Azure storage account is always replicated three times in the primary region. Azure Files offers two options for how your data is replicated in the primary region:
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- If your application stores data that can be easily reconstructed if data loss occurs.
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- If your application is restricted to replicating data only within a country or region due to data governance requirements. In some cases, the paired regions across which the data is geo-replicated might be in another country or region. For more information, see [Azure region pairs and nonpaired regions](/azure/reliability/regions-paired).
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LRS is supported in all Azure regions for standard file shares. For a list of regions that support LRS for premium file shares, see [LRS support for premium Azure file shares](redundancy-premium-file-shares.md#lrs-support-for-premium-azure-file-shares).
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LRS is supported in all Azure regions for HDD file shares. For a list of regions that support LRS for SSD file shares, see [LRS support for SSD file shares](redundancy-premium-file-shares.md#lrs-support-for-premium-azure-file-shares).
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### Zone-redundant storage
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To understand which regions support ZRS for standard file shares, see the [Azure regions list](/azure/reliability/regions-list#azure-regions-list-1) and refer to the availability zone support column. ZRS is supported in standard general-purpose v2 storage accounts for all three standard tiers: transaction optimized, hot, and cool.
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ZRS is supported for premium file shares through the `FileStorage` storage account kind. For a list of regions that support ZRS for premium file share accounts, see [ZRS support for premium Azure file shares](redundancy-premium-file-shares.md#zrs-support-for-premium-azure-file-shares).
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ZRS is supported for SSD file shares through the `FileStorage` storage account kind. For a list of regions that support ZRS for SSD file share accounts, see [ZRS support for SSD file shares](redundancy-premium-file-shares.md#zrs-support-for-premium-azure-file-shares).
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## Redundancy in a secondary region
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For applications requiring high durability for SMB file shares, you can choose geo-redundant storage to copy the data in your storage account to a secondary region that is hundreds of miles away from the primary region. If your storage account is copied to a secondary region, then your data is durable even in the case of a complete regional outage or a disaster in which the primary region isn't recoverable.
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> [!IMPORTANT]
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> Azure Files only supports geo-redundancy (GRS or GZRS) for standard SMB file shares. Premium file shares and NFS file shares must use LRS or ZRS.
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> Azure Files only supports geo-redundancy (GRS or GZRS) for HDD file shares. SSD file shares must use LRS or ZRS.
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When you create a storage account, you select the primary region for the account. The paired secondary region is determined based on the primary region, and can't be changed. For more information about regions supported by Azure, see the [Azure regions list](/azure/reliability/regions-list#azure-regions-list-1).
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> [!IMPORTANT]
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> Azure Files doesn't support read-access geo-redundant storage (RA-GRS) or read-access geo-zone-redundant storage (RA-GZRS). If a storage account is configured to use RA-GRS or RA-GZRS, the file shares will be configured and billed as GRS or GZRS.
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### Geo-redundancy for premium file shares
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### Geo-redundancy for SSD file shares
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As previously mentioned, geo-redundancy options (GRS and GZRS) aren't supported for premium file shares. However, you can achieve geo-redundancy in other ways.
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As previously mentioned, geo-redundancy options (GRS and GZRS) aren't supported for SSD file shares. However, you can achieve geo-redundancy in other ways.
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For Azure File Sync scenarios, you can sync between your Azure file share (your cloud endpoint), an on-premises Windows file server, and a mounted file share running on a virtual machine in another Azure region (your server endpoint for disaster recovery purposes). You must disable cloud tiering to ensure all data is present locally, and provision enough storage on the Azure VM to hold the entire dataset. To ensure changes will replicate quickly to the secondary region, files should only be accessed and modified on the server endpoint rather than in Azure.
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