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Update file-sync-planning.md
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articles/storage/file-sync/file-sync-planning.md

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@@ -4,7 +4,7 @@ description: Plan for a deployment with Azure File Sync, a service that allows y
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author: khdownie
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ms.service: storage
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ms.topic: conceptual
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ms.date: 05/27/2022
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ms.date: 06/01/2022
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ms.author: kendownie
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ms.subservice: files
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ms.custom: references_regions, devx-track-azurepowershell
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Note the volume savings only apply to the server; your data in the Azure file share will not be deduped.
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> [!Note]
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> To support Data Deduplication on volumes with cloud tiering enabled on Windows Server 2019, Windows update [KB4520062 - October 2019](https://support.microsoft.com/help/4520062) or a later monthly rollup update must be installed and Azure File Sync agent version 12.0.0.0 or newer is required.
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> To support Data Deduplication on volumes with cloud tiering enabled on Windows Server 2019, Windows update [KB4520062 - October 2019](https://support.microsoft.com/help/4520062) or a later monthly rollup update must be installed.
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**Windows Server 2012 R2**
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Azure File Sync does not support Data Deduplication and cloud tiering on the same volume on Windows Server 2012 R2. If Data Deduplication is enabled on a volume, cloud tiering must be disabled.
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Check out the [Azure File Sync and Azure file share migration overview](../files/storage-files-migration-overview.md?toc=%2fazure%2fstorage%2ffilesync%2ftoc.json) article where you can find detailed guidance for your scenario.
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## Antivirus
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Because antivirus works by scanning files for known malicious code, an antivirus product might cause the recall of tiered files, resulting in high egress charges. In versions 4.0 and above of the Azure File Sync agent, tiered files have the secure Windows attribute FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS set. We recommend consulting with your software vendor to learn how to configure their solution to skip reading files with this attribute set (many do it automatically).
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Because antivirus works by scanning files for known malicious code, an antivirus product might cause the recall of tiered files, resulting in high egress charges. Tiered files have the secure Windows attribute FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS set and we recommend consulting with your software vendor to learn how to configure their solution to skip reading files with this attribute set (many do it automatically).
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Microsoft's in-house antivirus solutions, Windows Defender and System Center Endpoint Protection (SCEP), both automatically skip reading files that have this attribute set. We have tested them and identified one minor issue: when you add a server to an existing sync group, files smaller than 800 bytes are recalled (downloaded) on the new server. These files will remain on the new server and will not be tiered since they do not meet the tiering size requirement (>64kb).
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