Determining VM doing I/O on a Hyper-V host
Solution 1:
Open Performance Monitor (run as Admin) on your local workstation. Add counter, select counters from the hyper-v machine, Hyper-V Virtual IDE Controller or Hyper-V Virtual Storage Device, select counters and instances (VMs) as seems appropriate. You might have to fish around a bit to find the counter that makes the most sense to you.
There are some good hints as to which Counters to look for in Monitoring Hyper-V Performance
Solution 2:
Syneticon-dj, I wrote something for you this afternoon. I thought this problem was interesting, so this simple script will give you the read and write IO stats on each running VM on the Hyper-V host. As an added bonus it associates each VM to its vmwp.exe's Process ID.
You can run this on your Hyper-V server, because it doesn't need a GUI.
The downside is that while I was working on this, I noticed that the performance counters were working great for a while, and then for no discernible reason they decided to all stay on zero. Well maybe it's not a bug, like Chris S says... but these counters might unfortunately not be very useful after all. Regardless, it would be very easy to modify the script to use the Virt. Storage Device counters instead.
The output looks like this:
PID VMName ReadBytesPerSec WriteBytesPerSec
--- ------ --------------- ----------------
5108 DC02 483.90 0
2796 DC01 0 0
3348 ECA01 4782668.27 0
#Requires -Version 3
function Get-VMPidAndIO
{
<#
.SYNOPSIS
Gets the Process ID and I/O statistics of each virtual machine running on the Hyper-V host.
.DESCRIPTION
Gets the Process ID and I/O statistics of each virtual machine running on the Hyper-V host.
Currently only works for VMs using virtual IDE controllers.
Requires Powershell 3 at a minimum.
.LINK
http://myotherpcisacloud.com
.NOTES
Written by Ryan Ries, June 2013.
[email protected]
#>
BEGIN
{
Try
{
$VMProcesses = Get-CimInstance -Query "Select ProcessId,CommandLine From Win32_Process Where Name ='vmwp.exe'" -ErrorAction Stop
}
Catch
{
Write-Error $_.Exception.Message
Return
}
}
PROCESS
{
}
END
{
Foreach($_ In $VMProcesses)
{
$VMName = $((Get-VM | Where Id -EQ $_.CommandLine.Split(' ')[-1]).Name)
[PSCustomObject]@{PID=$_.ProcessId;
VMName=$VMName;
ReadBytesPerSec=[Math]::Round($(Get-Counter "\Hyper-V Virtual IDE Controller (Emulated)($VMName`:Ide Controller)\Read Bytes/sec").CounterSamples.CookedValue, 2);
WriteBytesPerSec=[Math]::Round($(Get-Counter "\Hyper-V Virtual IDE Controller (Emulated)($VMName`:Ide Controller)\Write Bytes/sec").CounterSamples.CookedValue, 2); }
}
}
}