I'd take a look at Set-NcSIS
PS C:\Program Files (x86)\NetApp\OnCommand Windows PowerShell Cmdlets> help set-ncsis -full
NAME
Set-NcSis
SYNOPSIS
Set up or modify SIS (dedupe) policy, schedule or options for a volume.
SYNTAX
Set-NcSis [-Name] <String> [-Schedule <String>] [-Policy <String>] [-Compression [<Boolean>]] [-InlineCompression [
<Boolean>]] [-EnableIdd [<Boolean>]] [-QuickCheckFileSize <String>] [-VserverContext <String>] [-Controller <NcCont
roller[]>] [<CommonParameters>]
Set-NcSis [-Name] <String> [-Schedule <String>] [-Policy <String>] [-Compression [<Boolean>]] [-InlineCompression [
<Boolean>]] -InfiniteVolume [-EnableIdd [<Boolean>]] [-QuickCheckFileSize <String>] [-VserverContext <String>] [-Co
ntroller <NcController[]>] [<CommonParameters>]
DESCRIPTION
Set up or modify SIS (dedupe) policy, schedule or options for a volume.
When run with the InfiniteVolume switch, the cmdlet runs asynchronously. A job is returned. The status of the job
can be tracked using the Job cmdlets.