# Jonathan Medd, Alan Renouf 
# http://jonathanmedd.blogspot.com/2009/01/using-powershell-to-monitor-vmware.html
# check the cpu.usage.average statistic of a period of the last few minutes (watch out for the -IntervalMins parameter it can produce a period slightly different to what you would expect) and if its over 99% run the CheckHighCPU function and send the results by email.
# Requires: VI Toolkit

Function EmailWarning ()
{
	param ($ServerName,$Attachment)
	#Email warning
	Write-Output "Creating E-Mail Structure"
	
	$smtpServer = "servername"
	
	$msg = new-object Net.Mail.MailMessage
	$att = new-object Net.Mail.Attachment($attachment)
	$smtp = new-object Net.Mail.SmtpClient($smtpServer)
	
	$msg.From = "sender"
	$msg.To.Add("recipient")
	$msg.Subject = "Server Warning - High CPU on $Servername"
	$msg.Body = "$Servername has a CPU value of $HighCPU %"
	$msg.Attachments.Add($att)
	
	Write-Output "Send E-Mail"
	$smtp.Send($msg)
	
	$att.Dispose();
}

Function CheckHighCPU ()
{
	param ($Target)
	
	$procs_total = Get-WmiObject -Class Win32_PerfRawData_PerfProc_Process -Filter 'name="_total"' -ComputerName $Target
	$procs = Get-WmiObject -Class Win32_PerfRawData_PerfProc_Process -Filter 'name<>"_total"' -ComputerName $Target
	
	[int64]$totalpercentuser = 0
	foreach ($proc in $procs_total)
	{
		$totalpercentuser = $totalpercentuser + $proc.PercentUserTime}
		
		[decimal] $perc = [System.Convert]::ToDecimal($totalpercentuser)
		
		$myCol = @()
		foreach ($proc in $procs)
		{
			$proc_perct = (($proc.PercentUserTime / $perc) * 100)
			if ($proc_perct -gt 1){
			$Process = Get-WmiObject win32_process -ComputerName $target | where {$_.ProcessID -eq $proc.IDProcess}
			$MYInfo = "" | select-Object Name, CPUUsage,Owner, ProcessID
			$MYInfo.Name = $proc.name
			$MYInfo.ProcessID = $proc.IdProcess
			$MYInfo.CPUUsage = [Math]::Round($proc_perct, 0)
			$MYInfo.Owner = $process.GetOwner().user
			$myCol += $MYInfo
		}
	}

	$myCol | Sort-Object CPUUsage -Descending | Out-File $file
	EmailWarning $VMname $file
}

Connect-VIServer servername
$vms = Get-Cluster | where {$_.name -eq "ClusterName"} | get-vm
$time = Get-Date

do 
{
	foreach ($vm in $vms)
	{
		$VMname = $vm.name
		$filename = $VMname + '.txt'
		$file = "C:\Scripts\$filename"
		$stats = Get-Stat -entity $vm -IntervalMins 2 -stat cpu.usage.average -MaxSamples 1
		write-host $VMname
		$stats
		
		if ($stats.value -ge 99)
		{
			$HighCPU = $stats.value
			Write-Host "Warning!" -ForegroundColor red
			CheckHighCPU $VMname
		}
		else
		{
		}
	}

	Start-Sleep -Seconds 30
} until ($time.hour -ge 17)