Examine VMware CPU Ready Times with Powershell

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.

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VMware Stats Oneliner

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…)


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