http://www.lucd.info/2011/04/22/get-the-maximum-iops/
$metrics = "disk.numberwrite.summation","disk.numberread.summation"
$start = (Get-Date).AddMinutes(-5)
$report = @()
$vms = Get-VM | where {$_.PowerState -eq "PoweredOn"}
$stats = Get-Stat -Realtime -Stat $metrics -Entity $vms -Start $start
$interval = $stats[0].IntervalSecs
$lunTab = @{}
foreach($ds in (Get-Datastore -VM $vms | where {$_.Type -eq "VMFS"})){
$ds.ExtensionData.Info.Vmfs.Extent | %{
$lunTab[$_.DiskName] = $ds.Name
}
}
$report = $stats | Group-Object -Property {$_.Entity.Name},Instance | %{
New-Object PSObject -Property @{
VM = $_.Values[0]
Disk = $_.Values[1]
IOPSMax = ($_.Group | `
Group-Object -Property Timestamp | `
%{$_.Group[0].Value + $_.Group[1].Value} | `
Measure-Object -Maximum).Maximum / $interval
Datastore = $lunTab[$_.Values[1]]
}
}
$report
