Most virtual machines have a SCSI controller by default, depending on the guest operating system. If you have a heavily loaded virtual machine with multiple hard disks, you can add up to three additional SCSI controllers to assign the disks to. When you spread the disks among several controllers, you can improve performance and avoid data traffic congestion. You can also add additional controllers if you exceed the 15-device limit for a single controller.

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

Required privileges: Virtual machine.Configuration.Add or remove device

1

Right-click the virtual machine and select Edit Settings.

a

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

b

Click the Related Objects tab and click Virtual Machines.

2

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

3

Expand New 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. Select Thick provision eager zeroed when you create the disk.

Physical

Virtual disks can be shared by virtual machines on any ESXi host. Select Thick provision eager zeroed when you create the disk.

4

Select the controller type from the drop-down menu.

5

Click OK.

You can add a hard disk or other SCSI device to the virtual machine and assign it to the new SCSI controller.