Enabling multipathing on a Solaris host

This section describes how to enable multipathing on a Solaris host.

By default, multipathing is always enabled.

If multipathing is disabled on a Solaris host, perform the following steps to enable multipathing:

Open the /kernel/drv/iscsi.conf file.
Set the mpxio-disable parameter to yes.
```
mpxio-disable=”yes”
```
Verify that the parameter was modified.
For each candidate SCSI target device, the scsi_vhci variable must identify a failover module to support the device. If a failover module cannot be identified, the device cannot operate under scsi_vhci(7D) multipathing control. A product-specific override mechanism is available. You can use the scsi_vhci.conf base mechanism to direct a device to a specific failover module.
1. Add a third-party (non-Sun) symmetric storage device to run under scsi_vhci. This action takes advantage of scsi_vhci multipathing.
2. Add the vendor ID and product ID for the device to the /kernel/drv/scsi_vhci.conf file. The SCSI Inquiry command returns those strings.
```
device-type-scsi-options-list ="IBM     2145", "symmetric-option";
symmetric-option = 0x1000000;
```
  where <IBM> is the vendor ID, and <2145> is the product ID.
3. Save the file.
Reboot the system.
```
reboot --- -r
```
The -r option is the boot argument for reconfiguration boot. The system searches all attached hardware devices and configures the logical namespace in /dev.

Use the format command to find the device:

c2t6005076801A9027E6000000000000006d0<IBM-2145-0000 cyl 
10238 alt 2 hd 32 sec  64>
 /scsi_vhci/ssd@g6005076801a9027e6000000000000006