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articles/storage/file-sync/file-sync-cloud-tiering-policy.md

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@@ -14,7 +14,7 @@ Cloud tiering has two policies that determine which files are tiered to the clou
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The **volume free space policy** ensures that a specified percentage of the local volume the server endpoint is located on is always kept free.
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The **date policy** tiers files last accessed x days ago or later. The volume free space policy always takes precedence. When there isn't enough free space on the volume to store as many days worth of files as the date policy specifies, Azure File Sync overrides the date policy. It will continue tiering the coldest files until meeting the volume free space percentage.
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The **date policy** tiers files last accessed x days ago or later. The volume free space policy always takes precedence. When there isn't enough free space on the volume to store as many days worth of files as the date policy specifies, Azure File Sync overrides the date policy. It continues tiering the coldest files until meeting the volume free space percentage.
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## How both policies work together
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|File D | 1 year, 2 days ago | 120 GiB | Server and Azure file share
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|File E | 2 years, 1 day ago | 140 GiB | Server and Azure file share
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**Change 1:** You enabled cloud tiering, set a volume free space policy of 20%, and kept the date policy disabled. With that configuration, cloud tiering ensures 20% (in this case 100 GiB) of space is kept free and available on the local machine. As a result, the total capacity of the local cache is 400 GiB. This cache will store the most recently and frequently accessed files on the local volume.
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**Change 1:** You enabled cloud tiering, set a volume free space policy of 20%, and kept the date policy disabled. With that configuration, cloud tiering ensures 20% (in this case 100 GiB) of space is kept free and available on the local machine. As a result, the total capacity of the local cache is 400 GiB. This cache stores the most recently and frequently accessed files on the local volume.
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With this configuration, only files A through D would be stored in the local cache, and file E would be tiered. This only accounts for 360 GiB out of the 400 GiB that could be used. File E is 140 GiB and would exceed the 400 GiB limit if it was locally cached.
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With this configuration, only files A through D would be stored in the local cache, and file E would be tiered. This only accounts for 360 GiB out of the 400 GiB that could be used. File E is 140 GiB and would exceed the limit if it was locally cached.
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**Change 2:** Say a user accesses file E, making file E the most recently accessed file in the share. As a result, file E would be stored in the local cache and to fit under the 400 GiB limit, and file D would be tiered. The following table shows where the files are stored with these updates:
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**Change 2:** Say a user accesses file E, making file E the most recently accessed file in the share. As a result, file E would be stored in the local cache, and to fit under the limit of 400 GiB, file D would be tiered. The following table shows where the files are stored with these updates:
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|File Name |Last Access Time |File Size |Stored In |
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|----------|------------------|-----------|----------|
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|File E | 2 hours ago | 140 GiB | Server and Azure file share
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|File A | 2 days ago | 10 GiB | Server and Azure file share
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|File B | 10 days ago | 30 GiB | Server and Azure file share
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|File C | 1 year ago | 200 GiB | Server and Azure file share
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|File D | 1 year, 2 days ago | 120 GiB | Azure file share, tiered locally
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|File D | 1 year, 2 days ago | 120 GiB | Azure file share tiered locally
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**Change 3:** Imagine you updated the policies so that the date-based tiering policy is 60 days and the volume free space policy is 70%. Now, only up to 150 GiB can be stored in the local cache. Although file B was accessed less than 60 days ago, the volume free space policy overrides the date policy, and file B is tiered to maintain the 70% local free space.
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**Change 3:** Imagine you updated the policies so that the date policy is 60 days and the volume free space policy is 70%. Now, only up to 150 GiB can be stored in the local cache. Although file B was accessed less than 60 days ago, the volume free space policy overrides the date policy, and file B is tiered to maintain the 70% local free space.
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**Change 4:** If you changed the volume free space policy to 20% and then used `Invoke-StorageSyncFileRecall` to recall all the files that fit on the local drive while adhering to the cloud tiering policies, the table would look like this:
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|File E | 1 hour ago | 140 GiB | Server and Azure file share
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|File A | 2 days ago | 10 GiB | Server and Azure file share
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|File B | 10 days ago | 30 GiB | Server and Azure file share
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|File C | 1 year ago | 200 GiB | Azure file share, tiered locally
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|File D | 1 year, 2 days ago | 120 GiB | Azure file share, tiered locally
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|File C | 1 year ago | 200 GiB | Azure file share tiered locally
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|File D | 1 year, 2 days ago | 120 GiB | Azure file share tiered locally
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In this case, files A, B and E would be locally cached and files C and D would be tiered. Because the date policy is 60 days, files C and D are tiered, even though the volume free space policy allows for up to 400 GiB locally.
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In this case, files A, B, and E would be locally cached and files C and D would be tiered. Because the date policy is 60 days, files C and D are tiered, even though the volume free space policy allows for up to 400 GiB locally.
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> [!NOTE]
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> Files aren't automatically recalled when customers change the volume free space policy to a smaller value (for example, from 20% to 10%) or change the date policy to a larger value (for example, from 20 days to 50 days).

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