$vCenterServerName = "MyVC1.domain.local", "myVC2.domain.local" # Enter your vCenter server name here. In case of multiple vCenter servers, separate using a comma.
 
$ErrorActionPreference = "Stop"
 
# Connect to vCenter(s)
Write-Host "Connecting..."
$VC = Connect-VIServer $vCenterServerName
 
Write-Host "Counting physical cpu's and vRAM in your environment. Please be patient..."
# Gather information
$pCpu = (Get-VMHost | Get-View | Select -ExpandProperty Hardware | Select -ExpandProperty CpuInfo | Measure-Object -Property NumCpuPackages -Sum).Sum
$vRAM = [Math]::Round((Get-VM | Where {$_.PowerState -eq "PoweredOn"} | Measure-Object -Property MemoryMB -Sum).Sum/1024,0)
Write-Host "======"
"pCpu Count: {0}" -f $pCpu
"vRAM (GB):  {0}" -f $vRAM
Write-Host "======"
# Disconnect
Disconnect-VIServer $vCenterServerName -Confirm:$false
 
# Calculate required licenses
$licCol = @()
$licObj = "" | Select Edition, Entitlement, Licenses
$licObj.Edition = "Essentials/Essentials Plus/Standard"
$licObj.Entitlement = "1 pCpu + 32 GB vRAM"
If (($vRAM/32) -gt $pCpu)
{
	$licObj.Licenses = "{0} with {1} pCpu overhead" -f [Math]::Ceiling($vRAM/32), ([Math]::Ceiling($vRAM/32) - $pCpu)
}
Else
{
	$licObj.Licenses = "{0} with {1} GB vRAM overhead" -f $pCpu, ((32 * $pCpu) - $vRAM)
}
$licCol += $licObj
$licObj = "" | Select Edition, Entitlement, Licenses
$licObj.Edition = "Enterprise"
$licObj.Entitlement = "1 pCpu + 64 GB vRAM"
If (($vRAM/64) -gt $pCpu)
{
	$licObj.Licenses = "{0} with {1} pCpu overhead" -f [Math]::Ceiling($vRAM/64), ([Math]::Ceiling($vRAM/64) - $pCpu)
}
Else
{
	$licObj.Licenses = "{0} with {1} GB vRAM overhead" -f $pCpu, ((64 * $pCpu) - $vRAM)
}
$licCol += $licObj
$licObj = "" | Select Edition, Entitlement, Licenses
$licObj.Edition = "Enterprise Plus"
$licObj.Entitlement = "1 pCpu + 96 GB vRAM"
If (($vRAM/96) -gt $pCpu)
{
	$licObj.Licenses = "{0} with {1} pCpu overhead" -f [Math]::Ceiling($vRAM/96), ([Math]::Ceiling($vRAM/96) - $pCpu)
}
Else
{
	$licObj.Licenses = "{0} with {1} GB vRAM overhead" -f $pCpu, ((96 * $pCpu) - $vRAM)
}
$licCol += $licObj
# Displaying output
Write-Host "Resulting license options:"
$licCol
Write-Host "======"
Write-Host "NOTE: vRAM only counts memory allocated to vm's that are POWERED ON." -ForegroundColor Red 
Write-Host "NOTE: Please double check the results of this script, since hosts may have been omitted due to errors." -ForegroundColor Red 
Write-Host "Disclaimer: No rights can be deduced from this calculation." -ForegroundColor Red
Write-Host "======"

# Variables
$OutFile = "D:\Scripts\ReadyTimes.csv"
$VIServer = "MyVIServer.domain.local"
 
# Connect to Virtual Center
$VI = Connect-VIServer $VIServer
 
$myCol = @()
ForEach ($VMHost in (Get-VMHost | Sort Name))
	{
	ForEach ($VM in ($VMHost | Get-VM | Sort Name))
		{
		# Gather Stats
		$Ready = $VM | Get-Stat -Stat Cpu.Ready.Summation -RealTime
		$Used = $VM | Get-Stat -Stat Cpu.Used.Summation -RealTime
		$Wait = $VM | Get-Stat -Stat Cpu.Wait.Summation -RealTime
		For ($a = 0; $a -lt $VM.NumCpu; $a++)
			{
			$myObj = "" | Select VMHost, VM, Instance, %RDY, %USED, %WAIT
			$myObj.VMHost = $VMHost.Name
			$myObj.VM = $VM.Name
			$myObj.Instance = $a
			$myObj."%RDY" = [Math]::Round((($Ready | Where {$_.Instance -eq $a} | Measure-Object -Property Value -Average).Average)/200,1)
			$myObj."%USED" = [Math]::Round((($Used | Where {$_.Instance -eq $a} | Measure-Object -Property Value -Average).Average)/200,1)
			$myObj."%WAIT" = [Math]::Round((($Wait | Where {$_.Instance -eq $a} | Measure-Object -Property Value -Average).Average)/200,1)
			$myCol += $myObj
			}
		Clear-Variable Ready -ErrorAction SilentlyContinue 
		Clear-Variable Wait -ErrorAction SilentlyContinue 
		Clear-Variable Used -ErrorAction SilentlyContinue 
		Clear-Variable myObj -ErrorAction SilentlyContinue
		}
	}
 
Disconnect-VIServer -Confirm:$false
 
# Export and launch output
$myCol | Export-Csv $OutFile
Invoke-Item $OutFile