Param (
    [Parameter(
        Mandatory = $true,
        ValueFromPipeline = $true,
        ValueFromPipelineByPropertyName = $true, 
        ValueFromRemainingArguments = $false, 
        Position=0,
        ParameterSetName='VM Name'
    )]$vcServer,
    [Parameter(
        Mandatory = $true,
        ValueFromPipeline = $true,
        ValueFromPipelineByPropertyName = $true, 
        ValueFromRemainingArguments = $false, 
        Position=0,
        ParameterSetName='VM Name'
    )]$vmName
)

Begin {
    Add-PSSnapin VMware.VimAutomation.Core
    Add-PSSnapin VMware.VimAutomation.License
    Add-PSSnapin VMware.DeployAutomation

    $cred = Get-Credential
    Connect-VIServer -Server $vcServer -Credential $cred
    $Disks = @()
    $VmView = Get-View -Viewtype VirtualMachine | ? {$_.Name -eq $vmName}
    $Controllers = $VmView.Config.Hardware.Device | ? {$_.DeviceInfo.Label -like "SCSI controller *"}
    Foreach ($Controller in $Controllers) {
        $VDisks = $VmView.Config.Hardware.Device | ? {$_.ControllerKey -eq $Controller.Key}
        Foreach ($VDisk in $VDisks) {
            $Disk = New-Object PSObject -Property @{
                SCSIController = $Controller.DeviceInfo.Label
                DiskName = $VDisk.DeviceInfo.Label
                IscsiId = "$($Controller.BusNumber):$($VDisk.UnitNumber)"
                DiskFile = $VDisk.Backing.FileName
                DiskSize = $VDisk.CapacityInKB * 1KB / 1GB
            }
            $Disks += $Disk
        }
    }
    $Disks | FT -AutoSize
    Disconnect-VIServer -Server $vcServer -Confirm:$false
}