#Function to generate wait time progress bar
function Start-Sleep($seconds) {
    $doneDT = (Get-Date).AddSeconds($seconds)
    while($doneDT -gt (Get-Date)) {
    $secondsLeft = $doneDT.Subtract((Get-Date)).TotalSeconds
    $percent = ($seconds - $secondsLeft) / $seconds * 100
    Write-Progress -Activity "Sleeping" -Status "Sleeping..." -SecondsRemaining 
    $secondsLeft -PercentComplete $percent
    [System.Threading.Thread]::Sleep(500)
    }
Write-Progress -Activity "Sleeping" -Status "Sleeping..." -SecondsRemaining 0 - 
Completed
}

#Variables
$HotAddVMs = Import-CSV c:\temp\hot_add_disabled_vms.csv
$vmConfigSpec = New-Object VMware.Vim.VirtualMachineConfigSpec
$vmConfigSpec.CpuHotAddEnabled = "True"
$vmConfigSpec.MemoryHotAddEnabled = "True"

Foreach ($VM in ($HotAddVMs)) {
    
    #Shutdown Guest OS / Power off VM
    Get-VM $VM.Name | Shutdown-VMGuest -Confirm:$false

    #Wait for VM to power off before executing config cmd  
    section – in which case the config cmd will fail 
    while((Get-VM $VM.Name).PowerState -ne 'PoweredOff') {

    Start-Sleep -Seconds 10
    }
    
    #Execute config cmd
    $VMConfig = Get-View -VIObject $VM.Name
    $VMConfig.ReconfigVM($vmConfigSpec)

    #Power on VM
    Get-VM $VM.Name | Start-VM   
}