Enables data deduplication on one or more volumes.
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Last verified: 2026-10-26
Microsoft Deduplication reference: Enables data deduplication on one or more volumes. 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.
Use an account with the target resource permissions documented for Enable-DedupVolume. Modifying administrative cmdlets may require elevation or delegated administration. This catalog does not assert that ordinary users can execute the command.
Supported environments
Windows / Deduplication · Windows Server 2025 documentation; feature/module prerequisites apply
Parameters
-AsJob
Runs the cmdlet as a background job. Use this parameter to run commands that take a long time to complete. The cmdlet immediately returns an object that represents the job and then displays the command prompt. You can continue to work in the session while the job completes. To manage the job, use the *-Job cmdlets. To get the job results, use the Receive-Job cmdlet. For more information about Windows PowerShell background jobs, see about_Jobs.
-CimSession
Runs the cmdlet in a remote session or on a remote computer. Enter a computer name or a session object, such as the output of a New-CimSession or Get-CimSession cmdlet. The default is the current session on the local computer.
-DataAccess
Indicates that data access to deduplicated files on the volume is enabled.
-ThrottleLimit
Specifies the maximum number of concurrent operations that can be established to run the cmdlet. If this parameter is omitted or a value of 0 is entered, then Windows PowerShell® calculates an optimum throttle limit for the cmdlet based on the number of CIM cmdlets that are running on the computer. The throttle limit applies only to the current cmdlet, not to the session or to the computer.
-UsageType
Specifies the expected type of workload for the volume. This cmdlet sets several low-level settings to default values that are appropriate to the usage type that you specify. If you specify this parameter for a volume that already has data deduplication enabled, the cmdlet modifies the settings to the appropriate default values. If you run this cmdlet on a volume that already has data deduplication enabled but do not specify this parameter, the cmdlet does not change the usage type. The acceptable values for this parameter are: - HyperV A volume for Hyper-V storage. - Backup A volume that is optimized for virtualized backup servers. - Default A general purpose volume. If you do not specify a value for this parameter, the cmdlet uses a value of Default. If you specify a value of HyperV, the computer that has data deduplication enabled cannot be the same computer that runs Hyper-V. The two computers must communicate remotely.
Prerequisites
Windows with the Deduplication 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: Enable data deduplication on volumes
Enable-DedupVolume -Volume "D:","E:","F:"
This command enables data deduplication on volumes D:, E:, and F:. This command does not specify a value for the UsageType parameter, and, therefore, the cmdlet uses defaults for general purpose file server operations. Source: Microsoft, CC BY 4.0; transcript prompt/output removed. This example was not executed.