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Merge pull request #274441 from khdownie/patch-1
Update file-sync-choose-cloud-tiering-policies.md
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articles/storage/file-sync/file-sync-choose-cloud-tiering-policies.md

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@@ -4,7 +4,7 @@ description: Details on what to keep in mind when choosing Azure File Sync cloud
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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: 04/08/2024
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ms.date: 05/06/2024
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ms.author: kendownie
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---
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@@ -39,15 +39,15 @@ Azure File Sync supports cloud tiering on volumes with cluster sizes up to 2 MiB
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All file systems that are used by Windows organize your hard disk based on cluster size (also known as allocation unit size). Cluster size represents the smallest amount of disk space that can be used to hold a file. When file sizes don't come out to an even multiple of the cluster size, additional space must be used to hold the file - up to the next multiple of the cluster size.
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Azure File Sync is supported on NTFS volumes with Windows Server 2012 R2 and newer. The following table describes the default cluster sizes when you create a new NTFS volume with Windows Server 2019.
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Azure File Sync is supported on NTFS volumes with Windows Server 2012 R2 and newer. The following table describes the default cluster sizes when you create a new NTFS volume with Windows Server.
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|Volume size |Windows Server 2019 |
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|Volume size |Windows Server |
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|---------------|--------------------------------|
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|7 MiB – 16 TiB | 4 KiB |
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|16 TiB – 32 TiB | 8 KiB |
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|32 TiB – 64 TiB | 16 KiB |
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It's possible that upon creation of the volume, you manually formatted the volume with a different cluster size. If your volume stems from an older version of Windows, default cluster sizes might also be different. [This article provides more details on default cluster sizes.](https://www.disktuna.com/default-cluster-sizes-for-fat-exfat-and-ntfs/) Even if you choose a cluster size smaller than 4 KiB, an 8 KiB limit as the smallest file size that can be tiered still applies. (Even if technically 2x cluster size would equate to less than 8 KiB.)
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It's possible that upon creation of the volume, you manually formatted the volume with a different cluster size. If your volume stems from an older version of Windows, default cluster sizes might also be different. Even if you choose a cluster size smaller than 4 KiB, an 8 KiB limit as the smallest file size that can be tiered still applies. (Even if technically 2x cluster size would equate to less than 8 KiB.)
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The reason for the absolute minimum is due to the way NTFS stores extremely small files - 1 KiB to 4 KiB sized files. Depending on other parameters of the volume, it's possible that small files aren't stored in a cluster on disk at all. It's possibly more efficient to store such files directly in the volume's Master File Table or "MFT record". The cloud tiering reparse point is always stored on disk and takes up exactly one cluster. Tiering such small files could end up with no space savings. Extreme cases could even end up using more space with cloud tiering enabled. To safeguard against that, the smallest size of a file that cloud tiering will tier is 8 KiB on a 4 KiB or smaller cluster size.
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