Identifying virtual machines with Raw Device Mappings (RDMs) using PowerCLI

1. Open the vSphere PowerCLI command-line. 

2. Run the command:

Get-VM | Get-HardDisk -DiskType "RawPhysical","RawVirtual" | Select Parent,Name,DiskType,ScsiCanonicalName,DeviceName | fl

This command produces a list of virtual machines with RDMs, along with the backing SCSI device for the RDMs.

An output looks similar to:

Parent	Virtual Machine Display Name
Name	Hard Disk n
DiskType	RawVirtual
ScsiCanonicalName	naa.60123456789abcdef0123456789abcde
DeviceName	vml.020000000060123456789abcdef0123456789abcde1234567890ab

3.  If you need to save the output to a file the command can be modified:

Get-VM | Get-HardDisk -DiskType "RawPhysical","RawVirtual" | Select Parent,Name,DiskType,ScsiCanonicalName,DeviceName | fl | Out-File –FilePath RDM-list.txt
 

        4. Identify the backing SCSI device from either  the ScsiCanonicalName or DeviceName identifiers. 

Source VMware KB