You can add a VMware Paravirtual SCSI high performance storage controller to a virtual machine to provide greater throughput and lower CPU use.

VMware Paravirtual SCSI controllers are best suited for environments, especially SAN environments, running I/O-intensive applications.

For information about SCSI controller maximums and virtual device assignments, see SCSI Controller Configuration.

Verify that the virtual machine has a guest operating system with VMware Tools installed.

Verify that the virtual machine compatibility is ESXi 4.x and later.

Ensure that you are familiar with VMware Paravirtual SCSI limitations. See About VMware Paravirtual SCSI Controllers.

To access boot disk devices attached to a VMware Paravirtual SCSI controller, verify that the virtual machine has a Windows 2003 or Windows 2008 guest operating system.

In some operating systems, before you change the controller type, create a virtual machine with an LSI Logic controller, install VMware Tools, and then change to paravirtual mode.


Right-click the virtual machine and select Edit Settings.


To locate a virtual machine, select a datacenter, folder, cluster, resource pool, host, or vApp.


Click the Related Objects tab and click Virtual Machines.


On the Virtual Hardware tab, select SCSI Controller from the New device drop-down menu and click Add.

The controller appears at the bottom of the Virtual Hardware device list.


Expand SCSI controller and select VMware Paravirtual from the Change Type drop-down menu.


Click OK.