You can set the type of SCSI bus sharing for a virtual machine and indicate whether the SCSI bus is shared. Depending on the type of sharing, virtual machines can access the same virtual disk simultaneously on the same server or on any server.
You can change the SCSI controller configuration for a virtual machine on an ESXi host only.
Virtual Machine must be powered off
1. In the vSphere Client inventory, right-click the virtual machine and select Edit Settings.
2. Click the Hardware tab and select a SCSI Controller in the hardware list.
3. Select the type of sharing in the SCSI Bus Sharing from drop down list.
4. Click OK to save your changes and close the dialog box.