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Set-ReFSDedupSchedule

Sets the deduplication schedule on a specified ReFS volume.

PowerShell · Risk: High · Documentation Verified

Last verified: 2026-10-26

Microsoft Microsoft.ReFsDedup.Commands reference: Sets the deduplication schedule on a specified ReFS volume. The syntax and selected example below are adapted from the pinned Windows Server 2025 reference. Module availability, target configuration and delegated permissions determine whether it can run in your environment. Documentation and parameter text: Microsoft, CC BY 4.0; formatting adapted by Cmdlet World. No execution testing is claimed.

Set-ReFSDedupSchedule [-Volume] <String> -Start <DateTime> [-Duration <TimeSpan>] -Days <DaysOfWeek>
 [-CpuPercentage <UInt32>] [-ConcurrentOpenFiles <UInt32>] [-MinimumLastModifiedTimeHours <Int32>]
 [-ExcludeFileExtension <String[]>] [-ExcludeFolder <String[]>] [-CompressionFormat <Format>]
 [-CompressionLevel <UInt16>] [-CompressionChunkSize <UInt32>] [-CompressionTuning <UInt32>]
 [-RecompressionTuning <UInt32>] [-DecompressionTuning <UInt32>] [<CommonParameters>]

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Required permissions

Use an account with the target resource permissions documented for Set-ReFSDedupSchedule. Modifying administrative cmdlets may require elevation or delegated administration. This catalog does not assert that ordinary users can execute the command.

Supported environments

Windows / Microsoft.ReFsDedup.Commands · Windows Server 2025 documentation; feature/module prerequisites apply

Parameters

-CompressionChunkSize: Specifies the chunk size to use during compression.
-CompressionFormat: Specifies the compression format to use during deduplication. Acceptable values are: - LZ4 - Uncompressed - Unknown - ZSTD
-CompressionLevel: Specifies the compression level to use during deduplication.
-CompressionTuning: Specifies the compression tuning to use during deduplication.
-ConcurrentOpenFiles: Specifies the maximum number of files that can be open at the same time during deduplication.
-CpuPercentage: Specifies the maximum percentage of CPU usage that deduplication should consume.
-Days (required): Specifies the days of the week on which deduplication should run on the volume. Acceptable values are: - None - EveryDay - Monday - Tuesday - Wednesday - Thursday - Friday - Saturday - Sunday
-DecompressionTuning: Specifies the decompression tuning to use during deduplication.
-Duration: Specifies the duration for which deduplication should run on the volume.
-ExcludeFileExtension: Specifies one or more file extensions to exclude from deduplication.
-ExcludeFolder: Specifies one or more folders to exclude from deduplication.
-MinimumLastModifiedTimeHours: Specifies the minimum number of hours that must elapse before a file can be deduplicated.
-RecompressionTuning: Specifies the recompression tuning to use during deduplication.
-Start (required): Specifies the date and time when deduplication should start running on the volume.

Prerequisites

Windows with the Microsoft.ReFsDedup.Commands module and the Windows feature or management tools that provide it. Confirm target connectivity and version compatibility using the linked Microsoft reference.

Security considerations

This cmdlet changes system state. Review every target and parameter in the official reference, test outside production, and prepare an appropriate backup or rollback. Do not execute the example automatically.

Examples

Example 1

Set-ReFSDedupSchedule -Volume "D:" -Start "10:00 PM" -Days Monday,Wednesday,Friday -Duration 4:00:00

This example sets the deduplication schedule for the D: ReFS volume to run on Monday, Wednesday, and Friday at 10:00 PM for 4 hours. Source: Microsoft, CC BY 4.0; transcript prompt/output removed. This example was not executed.

Sources

https://github.com/MicrosoftDocs/windows-powershell-docs/blob/b7645dd8c687139b28e845119da30ec670526507/docset/winserver2025-ps/Microsoft.ReFsDedup.Commands/Set-ReFSDedupSchedule.md

https://learn.microsoft.com/powershell/module/microsoft.refsdedup.commands/set-refsdedupschedule?view=windowsserver2025-ps

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