Change the SCSI Controller Configuration

You can specify the SCSI controller type and you can set the type of SCSI bus sharing for a virtual machine.

The choice of a SCSI controller type 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.

The choice of a SCSI bus sharing option determines whether virtual machines on different hosts can access the same virtual disk.

Prerequisites

• Verify that you are familiar with the limitations and conditions for configuring SCSI controllers. See SCSI and SATA Storage Controller Conditions, Limitations, and Compatibility.
• Verify that you have the Virtual machine.Configuration.Modify device settings privilege on the virtual machine.

Procedure

1. Right-click a virtual machine in the inventory and select Edit Settings.
2. On the Virtual Hardware tab, expand SCSI controller, and select a SCSI controller type from the Change Type drop-down menu.

   Client	Steps
   vSphere Client	The vSphere 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.
   vSphere Web Client	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. You must confirm or discard the change. Click the Change Type button to change the controller type. Click the Don't change button to cancel the change and keep the original controller type.

   Caution: Changing the SCSI controller type might result in a virtual machine boot failure.
   The vSphere Client displays information about what happens if you change the SCSI controller type. If you select a controller type that is not recommended for the virtual machine's guest operating system, a warning is displayed.

   Do not select a BusLogic Parallel controller for virtual machines with disks larger than 2TB. This controller does not support large capacity hard disks.

3. On the Virtual Hardware tab, expand SCSI controller, and select the type of sharing in the SCSI Bus Sharing drop-down menu.

   Option	Description
   None	Virtual disks cannot be shared by other virtual machines.
   Virtual	Virtual disks can be shared by virtual machines on the same ESXi host.
   Physical	Virtual disks can be shared by virtual machines on any ESXi host.

   For virtual or physical bus sharing, select Thick provision eager zeroed when you create the disk.
4. Click OK.