Can you try this.
function Get-VolCompression ($controllernames,$exportdetails){
$array = @()
$controllernamesdetails = Get-Content $controllernames
foreach ($control in $controllernamesdetails)
{
$controllerdetails = Connect-NaController $control -Credential (Get-Credential)
$props = Get-NaVol | Get-NaSis
$object = New-Object psobject -Property @{
'ControllerName' = $props.Name
'VolumeName' = $props.Path
'IsCompressionEnabled' = $props.IsCompressionEnabled
}
$array+=$object
}
$array
$array | Export-Csv -Path $exportdetails
}
#Example
#Get-VolCompression -controllernames "c:\filer.txt" -exportdetails "c:\data"
