New-DifferencingVm

New-DifferencingVm.ps1

function New-DifferencingVm
{
    param (
        [Parameter(Mandatory=$true)]
        [string]$VMName, 

        [Parameter(Mandatory=$false)]
        [string]$DiskName=$VMName, 

        [Parameter(Mandatory=$false)]
        [ValidateSet('Windows11-x64-24h2-BusinessEditions-112024.vhdx')]
        [string]$BaseDiskName, 

        [Parameter(Mandatory=$true)]
        [ValidateSet('light', 'medium', 'heavy', 'custom')]
        [string]$Memory, 

        [Parameter(Mandatory=$true)]
        [ValidateSet('Default Switch','LAB-INTERNAL', 'LAB-EXTERNAL')]
        [string]$vSwitch,

        [parameter (Mandatory = $true)]
        [switch]$StartVm
    )

    # Config
    $HPVBaseLocation= Get-VMHost | Select-Object VirtualHardDiskPath -ExpandProperty VirtualHardDiskPath

    $VmLocation = "$HPVBaseLocation\"
    $BaseDiskLocation = "$HPVBaseLocation\PARENTS\Virtual HardDrives"



    # get basedisks
    if ($null -eq $BaseDiskName)
    {
        $BaseDiskName = Get-ChildItem -Path $BaseDiskLocation -Filter "*vhdx" | Select-Object name -ExpandProperty name | Out-GridView -PassThru -Title "Select the Parent Disk for $vmname"
    } 

    $VMConfig =@{
        path = "$VmLocation"
        name = $VMName
        NoVHD = $true
        generation = 2
        switch = $vSwitch
    }

    $VHDConfig =@{
        parentPath = "$BaseDiskLocation\$basediskname"
        path = "$VmLocation\$VMName\Virtual Hard Disks\$vmname.vhdx"
    }

    #Create a differencing disk based on our base disk
    New-VHD @VHDConfig -Differencing -Verbose


    #Create our VM
    New-VM @vmconfig 


    #Add the disk to our vm
    Add-VMHardDiskDrive -Path $($VHDConfig.path) -VMName $VMName -Verbose

    #config our firmware
    Set-VMFirmware -VMName $VMName -EnableSecureBoot 'on' -FirstBootDevice (Get-VMHardDiskDrive -VMName $VMName)

    switch ($Memory) 
    {
        "light"
        {
            Set-VMMemory -VMName $VMName -MinimumBytes 1Gb -StartupBytes 2Gb -MaximumBytes 4Gb
        }

        "medium"
        {
            Set-VMMemory -VMName $VMName -MinimumBytes 2Gb -StartupBytes 4Gb -MaximumBytes 8Gb
        }

        "heavy"
        {
            Set-VMMemory -VMName $VMName -MinimumBytes 4Gb -StartupBytes 8Gb -MaximumBytes 6Gb
        }
        
        Default {}
    }

    if ($StartVm ){Start-VM -Name $VMName -Verbose}

}