param([ValidateSet('KB','GB','TB')]$SizeUnitName = 'GB')
$local:zpool_cmd =  $null
$local:excludeType = ''

$script:SizeUnit = Invoke-Expression "1$SizeUnitName"
$script:SizeRound = 2
$SizeUnit /= 1KB

function NewDataRow{param($Size,$Used,$Available,$Percent,$Source,$FSType,$Target)
    [PSCustomObject]@{
        "Size$SizeUnitName"      = [Math]::Round($Size     /$SizeUnit, $SizeRound)
        "Used$SizeUnitName"      = [Math]::Round($Used     /$SizeUnit, $SizeRound)
        "Available$SizeUnitName" = [Math]::Round($Available/$SizeUnit, $SizeRound)
        'Used%'                  = [int]($Percent -replace '%$','')
        Source                   = $Source
        FSType                   = $FSType
        Target                   = $Target
    }
}

$local:df = @()
& df '--output=size,used,avail,pcent,source,fstype,target' | 
    Select-Object -Skip 1 | ForEach-Object {
        $local:df = $_.Split(' ', [StringSplitOptions]::RemoveEmptyEntries) 
        NewDataRow $df[0] $df[1] $df[2] $df[3] $df[4] $df[5] $df[6]
    } | Where-Object {
        -not ($_.FSType -eq 'zfs' -and $_.Source -match '/')
    } | Sort-Object -Property Target

#$zpool_cmd = get-command zpool | Where-Object CommandType -eq 'Application' | Select-Object -ExpandProperty Source
#if( $zpool_cmd ) {
#   $excludeType = '--exclude-type=zfs'
#}