Examine VMware CPU Ready Times with Powershell

admin — Fri, 12 Jun 2009 13:26:43 +0000

When your (VMware) consolidation ratios are becoming high, it might be smart to keep an eye on your vm’s CPU Ready Times. Unfortunately, by default, the VI Client will only show realtime ready time statistics. Plus you’d have to look at each vm individually. Thank ~~God~~ VMware for the PowerCLI! Read this document for more information on how to interpret the results.

# 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

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VMware Stats Oneliner

admin — Fri, 17 Oct 2008 13:53:42 +0000

Today’s oneliner is a nifty little function that reports the average CPU and Memory usage for one or more of your VMs, calculated over the last x hours:

function Get-VMStat
{
param( $VM,[Int32]$Hours = 1 )
$VM | Sort Name |
Select Name, @{N=”CPU”;E={[Math]::Round((($_ |
Get-Stat -Stat cpu.usage.average -Start (Get-Date).AddHours(-$Hours) -IntervalMins 5 -MaxSamples ($Hours*12) |
Measure-Object Value -Average).Average),2)}}, @{N=”MEM”;E={[Math]::Round((($_ |
Get-Stat -Stat mem.usage.average -Start (Get-Date).AddHours(-$Hours) -IntervalMins 5 -MaxSamples ($Hours*12) |
Measure-Object Value -Average).Average),2)}}
}

A great way to use it is like this:

Get-VMStat (Get-VM) -Hours 4 | Where {$_.CPU -gt 50 -or $_.MEM -gt 75}

I’m sure you can figure out what that does. Be the first to give the correct answer in the comments to win everlasting glory! (or at least until the next oneliner…)

Enjoy!

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PeetersOnline » Stat

Examine VMware CPU Ready Times with Powershell

VMware Stats Oneliner