$source = 'C:\compression_smb'
$share = '\\server\share_name'

# Create a 10 GB virtual disk for the demo
# Requires the hyper-v module
New-VHD $source\smb_demo.vhdx -Fixed -SizeBytes 10gb

# Use Robocopy.exe without SMB compression
ROBOCOPY $source $share *.vhdx

# Use Robocopy.exe to request SMB compression with /COMPRESS
ROBOCOPY $source $share *.vhdx /COMPRESS

# Create a share that always requires SMB compression
New-SmbShare -Name share -Path d:\share -CompressData $true

# Enable the default SMB compression request for an existing share
Set-SmbShare -Name share -CompressData $true

# Request SMB compression on mapped drives
# New-SMBMapping with -CompressNetworkTraffic $true.
New-SmbMapping -LocalPath Z: -RemotePath $share -CompressNetworkTraffic $true

# Map a drive using NET USE /REQUESTCOMPRESSION:YES.
NET USE * $share /REQUESTCOMPRESSION:YES

# Use Robocopy.exe to request SMB compression using /COMPRESS
ROBOCOPY $source $share *.vhdx /COMPRESS

# Use Xcopy.exe to request SMB compression with /COMPRESS
XCOPY $source\*.vhdx $share\* /COMPRESS
# Always compress (SMB client)
Set-ItemProperty -Path HKLM:\System\CurrentControlSet\ServicesLanmanWorkstation\Parameters `
-name EnableCompressedTraffic -value 1
# No restart is required.

# Ignore all compression requests (SMB client)
Set-SMbClientConfiguration -DisableCompression $true
# or
Set-ItemProperty -Path HKLM:\System\CurrentControlSet\Services\LanmanWorkstation\Parameters ` -name DisableCompression -value $true # or
-name DisableCompression -value 1
# No restart is required.

# Ignore all compression requests (SMB server)
Set-ItemProperty -Path HKLM:\System\CurrentControlSet\Services\LanmanServer\Parameters `
-name DisableCompression -value 1
# No restart is necessary.

# Always compress whatever the file size (Tries to compress the 4 1st GB of the file, if 1 byte is compressible, compresses the rest of the file).
Set-ItemProperty -Path HKLM\System\CurrentControlSet\Services\LanmanWorkstation\Parameters `
-name CompressibilitySamplingSize -value 4294967295
Set-ItemProperty -Path HKLM\System\CurrentControlSet\ServicesLanmanWorkstationParameters `
-name CompressibleThreshold -value 0