How to convert a RDM disk from Physical Compatibility mode to Virtual Compatibility mode

Purpose

This article provides steps to switch a Raw Data Mapping (RDM) between physical and virtual compatibility modes without data loss.

VMware KB - 1006599

Resolution

To change an RDM from physical to virtual compatibility mode:

Note: VMware recommends that you backup your configuration before performing these steps.

Step 1: Power off the virtual machine.
Step 2: Right-click the virtual machine and click Edit Settings.
Step 3: Note the SCSI device that the RDM is using (for example, SCSI0:5).
Step 4: Remove the RDM hard disk from the virtual machine, ensuring that the Delete from Disk option is selected, and then click OK.

Note: Unlike VMDK files, the Delete from Disk option removes only the RDM pointer files. Data on the RDM remains intact.

Step 5: Right-click the virtual machine and click Edit Settings.
Step 6: Add the RDM back to the virtual machine as a new disk and select virtual compatibility mode. Ensure that you use the SCSI device that you noted in step 3.
Step 7: Power on the virtual machine.

Note: An RDM can also be changed from virtual compatibility mode to physical compatibility mode. To change from virtual to physical compatibility mode, ensure there are no snapshots and select physical compatibility mode when completing step 6.