This article provides steps to identify Raw Device Mappings (RDMs) attached to registered virtual machines using the vSphere Client.

To identify RDMs using the vSphere Client:

1. Determine which RDM LUNs are part of an MSCS cluster. From the vSphere Client, select a virtual machine that has a mapping to the MSCS cluster RDM devices.
2. Edit your virtual machine settings and navigate to your Mapped RAW LUNs. In this example, Hard disk 2:
   
   
3. In the Physical, there is the specification of the device in use as RDM (that is, the vml ID).
4. Take note of the vml ID, which is a globally unique identifier for your shared device.
5. Identify the naa.id for this vml through the command esxcli storage core device list

• Identifying disks when working with VMware ESXi
• Identifying virtual machines with Raw Device Mappings (RDMs) using PowerCLI
• Raw Device Mapping for local storage