Determine Hyper-V Logical to Physical Processor Ratio using Windows PowerShell

According to the Hyper-V team, the ideal logical to physical processor ratio is between 4 and 8. Many Hyper-V servers run well below this level. Use the following PowerShell script to determine the logical to physical ratio on your Hyper-V server/s:

try {
    $Virtual_Processors = (Get-WmiObject -Namespace root\virtualization MSVM_Processor -ErrorAction Stop).Count
    $Logical_Processors = (Get-WMIObject Win32_Processor -ErrorAction Stop | Measure-Object -Property NumberOfLogicalProcessors -Sum).Sum
    $Ratio = $Virtual_Processors / $Logical_Processors
    if ($Ratio -lt 4) {
        Write-Host "$Ratio Virtual Processor(s) per Logical Processor" -ForegroundColor Red
        Write-Host "Your Logical to Physical Processor ratio is lower than the recommended value."
    } elseif ($ratio -gt 8) {
        Write-Host "$Ratio Virtual Processor(s) per Logical Processor" -ForegroundColor Red
        Write-Host "Your Logical to Physical Processor ratio is higher than the recommended value."
    } else {
        Write-Host "$Ratio Virtual Processor(s) per Logical Processor" -ForegroundColor Green
        Write-Host "Your Logical to Physical Processor ratio is in the ideal range"
    }
}
catch {
    Write-Host "WMI call failed. This script must be run on a Hyper-V Server." -ForegroundColor Red
}



When you run this script on a Hyper-V server, you will get an output similar to:



image



This script could be easily modified to check a remote server or a list of remote servers. There is also some redundant code in the script that could be removed or reduced.

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