You configure virtual SCSI controllers on your virtual machines to attach virtual disks and RDMs to.

The choice of SCSI controller does not affect whether your virtual disk is an IDE or SCSI disk. The IDE adapter is always ATAPI. The default for your guest operating system is already selected.

If you create an LSI Logic SAS virtual machine and add a virtual disk that uses BusLogic or LSI Logic adapters, the virtual machine boots from the BusLogic adapters disk. LSI Logic SAS is available only for virtual machines with ESXi 4.x and later compatibility. Disks with snapshots might not experience performance gains when used on LSI Logic SAS, VMware Paravirtual, and LSI Logic Parallel adapters.


Changing the SCSI controller type might result in a virtual machine boot failure.


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, expand SCSI controller, and select a SCSI controller type from the Change Type drop-down menu.

The vSphere Web Client displays information about what will happen if you change the controller type. If you have selected a controller type that is not recommended for the virtual machine's guest operating system, a warning is displayed.


Select whether to change the controller type.

Click Change Type to change the controller type.

Click Don't change to cancel the change and keep the original controller type.


Click OK.