Right Mike. Added the line to Un-mount the volume.
##Begin Code
param (
[parameter(Mandatory=$true, HelpMessage="Cluster IP address")]
[string]$Cluster,
[parameter(Mandatory=$true, HelpMessage="Volume name")]
[string]$VolumeName,
[parameter(Mandatory=$true, HelpMessage="Storage Virtual Machine name")]
[string]$VserverName
)
Connect-WfaCluster $Cluster -Vserver $VserverName
Dismount-NcVol -Name $VolumeName
Set-NcVol -Name $VolumeName -Offline
##End code
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