We don’t store or report on VMs currently, mainly because we were trying to keep track of total REAL disk used.  VMs often don’t use as much as they think they do, so that would skew the results, as well as the fact that we are reporting on the hosts. 

All of that is the reason that Patrick asked me to come up with some other tool to use for the VMs so I happened to find a few pieces of PowerShell script that I managed to put together to do a pretty good job of providing some of the info we wanted, and I thought I would share that with the 2 people who read my blog. 

$servers = Get-Content servers.txt

#Open Excel and create a new workbook and worksheet
$ExcelSheet=New-Object -comobject Excel.application   
$WorkBook=$ExcelSheet.WorkBooks.add(1)    
$WorkSheet=$WorkBook.WorkSheets.item(1)               

#Header row
$WorkSheet.cells.item(1,1)=”Computer Name”               
$WorkSheet.cells.item(1,2)=”Disk Device ID”              
$WorkSheet.cells.item(1,3)=”Volume Name”                 
$WorkSheet.cells.item(1,4)=”Size (GB)”        
$WorkSheet.cells.item(1,5)=”Free Space (GB)”
$WorkSheet.cells.item(1,6)=”Space Used (GB)”
$WorkSheet.cells.item(1,7)=”Percent Used”

$i=2

ForEach ($ComputerName in $servers)
{   
    echo "Server Name : ", $ComputerName
    $Disks = gwmi –computername $ComputerName win32_logicaldisk -filter "drivetype=3"

    foreach ($Disk in $Disks)
    {
        $Size = "{0:0.0}" -f ($Disk.Size/1GB)
        $FreeSpace = "{0:0.0}" -f ($Disk.FreeSpace/1GB)
        $Used = ([int64]$Disk.size – [int64]$Disk.freespace)
        $SpaceUsed = "{0:0.0}" -f ($Used/1GB)
        $Percent = ($Used * 100.0)/$Disk.Size
        $Percent = "{0:N0}" -f $Percent
               $WorkSheet.cells.item($i,1)=$ComputerName
            $WorkSheet.cells.item($i,2)=$Disk.deviceid
            $WorkSheet.cells.item($i,3)=$Disk.volumename
            $WorkSheet.cells.item($i,4)=$Size
            $WorkSheet.cells.item($i,5)=$FreeSpace
            $WorkSheet.cells.item($i,6)=$SpaceUsed
            $WorkSheet.cells.item($i,7)=$Percent

            $i=$i+1     
    }
}
#Show the results
$ExcelSheet.visible=$true

If you use Hyper-V, or any OS virtualization platform, you know that you can’t trust the Windows Task Manager from inside the VMs to tell you squat.  Basically, the virtualization layer pulls the rug out from under the guest OS when it comes to CPU and the guest is clueless and assumes that whatever was paused just ate CPU the whole time.

I was looking at a performance issue on Hyper-V and needed to investigate.  Searching the web I found Perfmon info but got sick of setting that up, and then having to do paper and pencil math to figure out what I wanted to know.  So I did what I always do — I wrote a tool!  The tool is called HyperV_Mon and is basically a GUI that does all the hard work for you.

HyperV_Mon: a new free tool if you use Hyper-V – Tim Mangan – BrianMadden.com