When you add a SCSI device to a virtual machine, you select the physical device to connect to and the virtual device node.
Select a virtual machine.
In the virtual machines and templates inventory tree, select a group of virtual machines and select a virtual machine from the list on the right.
Search for a virtual machine and select it from the search results list.
In the VM Hardware panel, click Edit Settings.
Click Virtual Hardware.
From the Add a device drop-down menu, select SCSI Device and click Add Device.
The new SCSI device appears in the virtual devices list above.
Click the triangle next to the SCSI device to expand the device options.
From the Connection drop-down menu, select the physical SCSI device to connect to.
(Optional) From the Virtual Device Node drop-down menu, select the virtual device node.
Click OK.