List RDM Disks in a Cluster Using PowerCLI

Hello everyone! Earlier today, I was looking for a way to list the RDM disks that are currently attached and in use by VMs within a specific cluster. See, we’re in the process of decommissioning an old SAN array, and I needed to verify that specific LUNs and RDMs were no longer in use. I came across this post over on the VMware Communities portal, but needed made a minor tweak, as I only wanted to search a specific cluster. By the way… HUGE thanks to user LucD for posting the original script! After running this script, I was then able to search the output to ensure that the LUN WWNs I needed to decommission weren’t in the list.

$report = @()
$vms = Get-Cluster -name "Cluster01" | Get-VM | Get-View
foreach($vm in $vms){
     foreach($dev in $vm.Config.Hardware.Device){
          if(($dev.gettype()).Name -eq "VirtualDisk"){
               if(($dev.Backing.CompatibilityMode -eq "physicalMode") -or 
               ($dev.Backing.CompatibilityMode -eq "virtualMode")){
                    $row = "" | select VMName, VMHost, HDDeviceName, HDFileName, HDMode, HDsize, HDDisplayName
                    $row.VMName = $vm.Name
                    $esx = Get-View $vm.Runtime.Host
                    $row.VMHost = ($esx).Name
                    $row.HDDeviceName = $dev.Backing.DeviceName
                    $row.HDFileName = $dev.Backing.FileName
                    $row.HDMode = $dev.Backing.CompatibilityMode
                    $row.HDSize = $dev.CapacityInKB
                    $row.HDDisplayName = ($esx.Config.StorageDevice.ScsiLun | where {$_.Uuid -eq $dev.Backing.LunUuid}).DisplayName
                    $report += $row
               }
          }
     }
}
$report

First blog post

Hello, everyone! I’m launching this new web site as a way to share technology-related information and experiences that others might find useful. My goal is to focus mainly on virtualization, but I hope to include other consumer-level tech content as well. For those of you that know me already, I’ve talked about all these various ideas I’ve had for a while now. Starting this web site is the first step in turning some of these ideas in to action. Let’s see how this goes!