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articles/storage/files/storage-files-faq.md

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* <a id="cross-domain-sync"></a>
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**Can I have domain-joined and non-domain-joined servers in the same sync group?**
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Yes. A sync group can contain server endpoints that have different Active Directory memberships, even if they are not domain-joined. Although this configuration technically works, we do not recommend this as a typical configuration because access control lists (ACLs) that are defined for files and folders on one server might not be able to be enforced by other servers in the sync group. For best results, we recommend syncing between servers that are in the same Active Directory forest, between servers that are in different Active Directory forests but have [established trust relationships](storage-files-identity-multiple-forests.md#how-forest-trust-relationships-work), or between servers that aren't in a domain. We recommend that you avoid using a mix of these configurations.
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Yes. A sync group can contain server endpoints that have different Active Directory memberships, even if they aren't domain-joined. Although this configuration technically works, we don't recommend this as a typical configuration because access control lists (ACLs) that are defined for files and folders on one server might not be able to be enforced by other servers in the sync group. For best results, we recommend syncing between servers that are in the same Active Directory forest, between servers that are in different Active Directory forests but have [established trust relationships](storage-files-identity-multiple-forests.md#how-forest-trust-relationships-work), or between servers that aren't in a domain. We recommend that you avoid using a mix of these configurations.
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* <a id="afs-change-detection"></a>
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**I created a file directly in my Azure file share by using SMB or in the portal. How long does it take for the file to sync to the servers in the sync group?**
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\<FileNameWithoutExtension\>-\<endpointName\>\[-#\].\<ext\>
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For example, the first conflict of CompanyReport.docx would become CompanyReport-CentralServer.docx if CentralServer is where the older write occurred. The second conflict would be named CompanyReport-CentralServer-1.docx. Azure File Sync supports 100 conflict files per file. Once the maximum number of conflict files has been reached, the file will fail to sync until the number of conflict files is less than 100.
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For example, the first conflict of CompanyReport.docx would become CompanyReport-CentralServer.docx if CentralServer is where the older write occurred. The second conflict would be named CompanyReport-CentralServer-1.docx. Azure File Sync supports 100 conflict files per file. Once the maximum number of conflict files is reached, the file will fail to sync until the number of conflict files is less than 100.
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* <a id="afs-tiered-files-tiering-disabled"></a>
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**I have cloud tiering disabled, why are there tiered files in the server endpoint location?**
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- If cloud tiering was enabled on the server endpoint and then disabled, files will remain tiered until they're accessed.
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* <a id="afs-tiered-files-not-showing-thumbnails"></a>
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**Why are my tiered files not showing thumbnails or previews in Windows Explorer?**
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For tiered files, thumbnails and previews won't be visible at your server endpoint. This behavior is expected since the thumbnail cache feature in Windows intentionally skips reading files with the offline attribute. With Cloud Tiering enabled, reading through tiered files would cause them to be downloaded (recalled).
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**Why are my tiered files not showing thumbnails or previews in Windows File Explorer?**
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For tiered files, thumbnails and previews won't be visible at your server endpoint. This is expected behavior because the thumbnail cache feature in Windows intentionally skips reading files with the offline attribute. With Cloud Tiering enabled, reading through tiered files would cause them to be downloaded (recalled).
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This behavior isn't specific to Azure File Sync. Windows Explorer displays a "grey X" for any files that have the offline attribute set. You'll see the X icon when accessing files over SMB. For a detailed explanation of this behavior, refer to [Why don’t I get thumbnails for files that are marked offline?](https://devblogs.microsoft.com/oldnewthing/20170503-00/?p=96105)
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This behavior isn't specific to Azure File Sync. Windows File Explorer displays a "grey X" for any files that have the offline attribute set. You'll see the X icon when accessing files over SMB. For a detailed explanation of this behavior, refer to [Why don’t I get thumbnails for files that are marked offline?](https://devblogs.microsoft.com/oldnewthing/20170503-00/?p=96105)
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For questions on how to manage tiered files, see [How to manage tiered files](../file-sync/file-sync-how-to-manage-tiered-files.md).
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* <a id="afs-tiered-files-out-of-endpoint"></a>
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**Why do tiered files exist outside of the server endpoint namespace?**
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Prior to Azure File Sync agent version 3, Azure File Sync blocked the move of tiered files outside the server endpoint but on the same volume as the server endpoint. Copy operations, moves of non-tiered files, and moves of tiered to other volumes were unaffected. The reason for this behavior was the implicit assumption that File Explorer and other Windows APIs have that move operations on the same volume are (nearly) instantaneous rename operations. This means moves will make File Explorer or other move methods (such as command line or PowerShell) appear unresponsive while Azure File Sync recalls the data from the cloud. Starting with [Azure File Sync agent version 3.0.12.0](../file-sync/file-sync-release-notes.md#supported-versions), Azure File Sync will allow you to move a tiered file outside of the server endpoint. We avoid the negative effects previously mentioned by allowing the tiered file to exist as a tiered file outside of the server endpoint and then recalling the file in the background. This means that moves on the same volume are instantaneous, and we do all the work to recall the file to disk after the move has completed.
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Prior to Azure File Sync agent version 3, Azure File Sync blocked the move of tiered files outside the server endpoint but on the same volume as the server endpoint. Copy operations, moves of non-tiered files, and moves of tiered to other volumes were unaffected. The reason for this behavior was the implicit assumption that File Explorer and other Windows APIs have that move operations on the same volume are (nearly) instantaneous rename operations. This means moves will make File Explorer or other move methods (such as command line or PowerShell) appear unresponsive while Azure File Sync recalls the data from the cloud. Starting with [Azure File Sync agent version 3.0.12.0](../file-sync/file-sync-release-notes.md#supported-versions), Azure File Sync will allow you to move a tiered file outside of the server endpoint. We avoid the negative effects previously mentioned by allowing the tiered file to exist as a tiered file outside of the server endpoint and then recalling the file in the background. This means that moves on the same volume are instantaneous, and we do all the work to recall the file to disk after the move is complete.
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* <a id="afs-do-not-delete-server-endpoint"></a>
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**I'm having an issue with Azure File Sync on my server (sync, cloud tiering, etc.). Should I remove and recreate my server endpoint?**
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[!INCLUDE [storage-sync-files-remove-server-endpoint](../../../includes/storage-sync-files-remove-server-endpoint.md)]
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* <a id="afs-resource-move"></a>
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**Can I move the storage sync service and/or storage account to a different resource group, subscription, or Azure AD tenant?**
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Yes, the storage sync service and/or storage account can be moved to a different resource group, subscription, or Azure AD tenant. After the storage sync service or storage account is moved, you need to give the Microsoft.StorageSync application access to the storage account (see [Ensure Azure File Sync has access to the storage account](../file-sync/file-sync-troubleshoot-sync-errors.md?tabs=portal1%252cportal#troubleshoot-rbac)).
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Yes, you can move the storage sync service and/or storage account to a different resource group, subscription, or Azure AD tenant. After you move the storage sync service or storage account, you need to give the Microsoft.StorageSync application access to the storage account (see [Ensure Azure File Sync has access to the storage account](../file-sync/file-sync-troubleshoot-sync-errors.md?tabs=portal1%252cportal#troubleshoot-rbac)).
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> [!Note]
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> When creating the cloud endpoint, the storage sync service and storage account must be in the same Azure AD tenant. Once the cloud endpoint is created, the storage sync service and storage account can be moved to different Azure AD tenants.
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As of February 24, 2020, new and existing ACLs tiered by Azure file sync will be persisted in NTFS format, and ACL modifications made directly to the Azure file share will sync to all servers in the sync group. Any changes on ACLs made to Azure Files will sync down via Azure file sync. When copying data to Azure Files, make sure you use a copy tool that supports the necessary "fidelity" to copy attributes, timestamps and ACLs into an Azure file share - either via SMB or REST. When using Azure copy tools, such as AzCopy, it's important to use the latest version. Check the [file copy tools table](storage-files-migration-overview.md#file-copy-tools) to get an overview of Azure copy tools to ensure you can copy all of the important metadata of a file.
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If you have enabled Azure Backup on your file sync managed file shares, file ACLs can continue to be restored as part of the backup restore workflow. This works either for the entire share or individual files/directories.
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If you've enabled Azure Backup on your file sync managed file shares, file ACLs can continue to be restored as part of the backup restore workflow. This works either for the entire share or individual files/directories.
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If you're using snapshots as part of the self-managed backup solution for file shares managed by file sync, your ACLs may not be restored properly to NTFS ACLs if the snapshots were taken before February 24, 2020. If this occurs, consider contacting Azure Support.
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## Network File System (NFS v4.1)
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* <a id="when-to-use-nfs"></a>
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**When should I use Azure Files NFS?**
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**When should I use NFS Azure file shares?**
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See [NFS shares](files-nfs-protocol.md).
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* <a id="migrate-nfs-data"></a>
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**Can I migrate existing data to an NFS share?**
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Within a region, you can use standard tools like scp, rsync, or SSHFS to move data. Because Azure Files NFS can be accessed from multiple compute instances concurrently, you can improve copying speeds with parallel uploads. If you want to bring data from outside of a region, use a VPN or a ExpressRoute to mount to your file system from your on-premises data center.
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Within a region, you can use standard tools like scp, rsync, or SSHFS to move data. Because NFS Azure file shares can be accessed from multiple compute instances concurrently, you can improve copying speeds with parallel uploads. If you want to bring data from outside of a region, use a VPN or a ExpressRoute to mount to your file system from your on-premises data center.
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* <a id=nfs-ibm-mq-support></a>
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**Can you run IBM MQ (including multi-instance) on Azure Files NFS?**
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* Azure Files NFS v4.1 file shares meets the three requirements set by IBM MQ:
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**Can you run IBM MQ (including multi-instance) on NFS Azure file shares?**
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* Azure Files NFS v4.1 file shares meet the three requirements set by IBM MQ:
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- https://www.ibm.com/docs/en/ibm-mq/9.2?topic=multiplatforms-requirements-shared-file-systems
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+ Data write integrity
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+ Guaranteed exclusive access to files
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## Billing and pricing
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* <a id="transactions-billing"></a>
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**What are transactions in Azure Files, and how are they billed?**
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Protocol transactions occur any time a user, application, script, or service interacts with Azure file shares (writing, reading, listing, deleting files, etc.). It's important to remember that some actions that you might perceive as a single operation might actually involve multiple transactions. For standard Azure file shares billed on a pay-as-you-go model, different types of transactions have different prices based on their impact on the file share. Transactions don't affect billing for premium file shares, which are billed using a provisioned model. For more information, see [Understanding billing](understanding-billing.md).
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