How to Manage Multipathing for Virtual SCSI HBAs in a Guest Domain

Copy the /platform/sun4v/kernel/drv/vhba.conf file to the /etc/driver/drv directory.
```
# cp /platform/sun4v/kernel/drv/vhba.conf /etc/driver/drv
```
Configure multipathing by modifying the /etc/driver/drv/vhba.conf file.

You can configure virtual HBA initiator port (port) multipathing on a per-port or global basis. Per-port settings have priority over the global setting.
- Enable multipathing for all vhba instances in a guest domain.
  
  Add only the following line to the vhba.conf file:
```
mpxio-disable="no"
```
- Disable multipathing for all vhba instances in a guest domain.
  
  Add only the following line to the vhba.conf file:
```
mpxio-disable="yes"
```
- Enable all vhba instances except vhba@1.
  
  Add the following lines to the vhba.conf file:
```
mpxio-disable="yes"
compatible="/virtual-devices@100/channel-devices@200/scsi@1/iport@0" mpxio-disable="no";
```
  Note that vhba@1 is what is shown in the ldm list -o hba command output, but scsi@1 is how vhba@1 is known to the operating system.
- Disable all vhba instances except vhba@1.
  
  Add the following lines to the vhba.conf file:
```
mpxio-disable="no"
compatible="/virtual-devices@100/channel-devices@200/scsi@1/iport@0" mpxio-disable="yes";
```
Reboot the guest domain.