VMware PowerCLI script to get VM's virtual and RDM disk information

I have been tasked to migrate several VMs with RDM disks between storage arrays / datastores. The data LUNs have been migrated/copied and all was left is the migration of the VM configuration files and RDM pointers. To make matter even worse, VMs in question were Oracle RAC clustered VMs therefore is was imperative to migrate the disks and SCSI IDs in “like it was before” way.

Let me start with a script that lists VM’s virtual and RDM disks, SCSI IDs and Disk Device Name and files names:

$DiskInfo= @()
foreach ($VMview in Get-VM node001, node002 | Get-View){
foreach ($VirtualSCSIController in ($VMView.Config.Hardware.Device | where {$_.DeviceInfo.Label -match "SCSI Controller"})) {
foreach ($VirtualDiskDevice in ($VMView.Config.Hardware.Device | where {$_.ControllerKey -eq $VirtualSCSIController.Key})) {
$VirtualDisk = "" | Select VMname, SCSIController, DiskName, SCSI_ID, DeviceName, DiskFile, DiskSize
$VirtualDisk.VMname = $VMview.Name
$VirtualDisk.SCSIController = $VirtualSCSIController.DeviceInfo.Label
$VirtualDisk.DiskName = $VirtualDiskDevice.DeviceInfo.Label
$VirtualDisk.SCSI_ID = "$($VirtualSCSIController.BusNumber) : $($VirtualDiskDevice.UnitNumber)"
$VirtualDisk.DeviceName = $VirtualDiskDevice.Backing.DeviceName
$VirtualDisk.DiskFile = $VirtualDiskDevice.Backing.FileName
$VirtualDisk.DiskSize = $VirtualDiskDevice.CapacityInKB * 1KB / 1GB
$DiskInfo += $VirtualDisk
}}}
$DiskInfo | sort VMname, Diskname | Export-Csv -Path 'd:DiskInfo.csv'
# You can also use FT -AutoSize or Out-GridView if it helps

The script output shows everything you need to complete the migration successfully:

To migrate both VMs to another Datastore you just need to (BTW, please refer to ‘Migrating virtual machines with Raw Device Mappings (RDMs) (1005241)‘ VMware KB article for more info):

1. Using vCenter Web Client you migrate Node001 to the new datastore (this will move the RDM pointers as well);
2. Remove RDM disk from the Node002;
3. Migrate Node002 to the new datastore;
4. Add cluster RDM disks to Node002 using the information provided by the script.

Job done.

You may also play with where command:

# Find VM with a specific RDM disk name or LUN ID :

Get-VM | Get-View | where {$_.Config.Hardware.Device.Backing.DeviceName -match "514f0c511580009f"}

# Find VM with a RDM disk on s specific storage array – c5cc2 is the LUN ID prefix :

Get-VM | Get-View | where {$_.Config.Hardware.Device.Backing.DeviceName -match "c5cc2"}

I hope this will help.