A quick way to find all the hosts that have a portgroup with a specific name is the following

$pgName = "MyPG"
Get-VMHost | %{
	if($_ | Get-VirtualPortGroup -Name $pgName -ea SilentlyContinue){
		$_.Name
	}
}

Note the -ea (-ErrorAction) parameter. It avoids error messages for those host where the portgroup is not present.

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Blog: LucD notes

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