You can add a paravirtual SCSI (PVSCSI) high performance storage adapter to provide greater throughput and lower CPU utilization.

PVSCSI adapters are best suited for environments, especially SAN environments, running I/O-intensive applications.

Windows 2003 and 2008 guest operating systems support boot disk devices attached to a PVSCSI adapter.

PVSCSI adapters do not support bootable disks on Red Hat Linux 5 virtual machines. You must configure such virtual machines with a primary SCSI adapter other than PVSCSI to support a disk where the system software is installed.

An existing virtual machine with a guest operating system and VMware Tools installed.


In the vSphere Client inventory, right-click the virtual machine and select Edit Settings.


Click the Hardware tab and click Add.


Select SCSI Device and click Next.


Select a SCSI device in the Connection panel.


Select an unused Virtual Device Node and click Next.

For device node SCSI (0:2), 0 is the controller number and 2 is the number of the device that is attached to the controller. If you select a node on which devices already exist (for example, SCSI 0:3) you will add a SCSI device to the existing adapter. To add a new adapter, you must select an unused device node (for example 1:0).


Review your selections and click Finish.

New SCSI Controller (adding) and New SCSI Device (adding) appear in the Hardware list.


Click OK to save your changes and exit the dialog box.


Reopen the Virtual Machine Properties Editor.


Select the new SCSI controller and click Change Type.


Select VMware Paravirtual and click OK.


Click OK to save your changes and close the dialog box.