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##### `probe-scsi-all` WWN Mapping Example (Netra SPARC T4-1)

The Netra SPARC T4-1 server uses only one of the two SAS2 RAID controllers on the motherboard. The controller connects to four slots on the disk backplane. The following table shows the PhyNum-to-disk slot mapping.

Table 10 SAS2 Controller Port Mapping for the Netra SPARC T4-1 Disk Backplane

SAS2 Controller | Controller Port (PhyNum) | Disk Slot |  | SAS2 Controller | Controller Port (PhyNum) | Disk Slot
--- | --- | --- | --- | --- | --- | ---
0 | Not Used |  | 1 | 01 | 0
|  |  | 1 | 1
|  |  | 2 | 2
|  |  | 3 | 3

1Default boot drive

The following example is based on a Netra SPARC T4-1 server with four hard drives. These hard drives are deployed as four individual storage devices. Controller 1 is attached to these storage devices in the following manner:

- Controller 1 is attached to Targets 9, b, c, and d (four individual storage devices).

- Target a (is a DVD drive).

Note - For Netra SPARC T4-1 servers, the second field of the device path specifies the controllers: `/pci@400/pci@2` = controller 1 and /pci@400/`pci@1` = controller 0.

    ok probe-scsi-all
    /pci@400/pci@2/pci@0/pci@f/pci@0/usb@0,2/hub@2/hub@3/storage@2
    Unit 0   Removable Read Only device    AMI     Virtual CDROM   1.00

    /pci@400/pci@2/pci@0/pci@4/scsi@0                 <---- SAS controller 1

    FCode Version 1.00.56, MPT Version 2.00, Firmware Version 9.00.00.00

    Target 9
    Unit 0   Disk HITACHI  H106030SDSUN300G A2B0    585937500 Blocks, 300 GB
    SASDeviceName 5000cca012b76b40  SASAddress 5000cca012b76b41  PhyNum 0<-HD slot 0
    Target a
    Unit 0   Removable Read Only device   TEAC     DV-W28SS-V       1.0B
    SATA device  PhyNum 6                                                           <- DVD
    Target b
    Unit 0   Disk   HITACHI  H103030SCSUN300G A2A8    585937500 Blocks, 300 GB
    SASDeviceName 5000cca00a4d2ff0  SASAddress 5000cca00a4d2ff1  PhyNum 2<-HD slot 2
    Target c
    Unit 0   Disk   SEAGATE  ST930003SSUN300G 0868    585937500 Blocks, 300 GB
    SASDeviceName 5000c50017871633  SASAddress 5000c50017871631  PhyNum 1 <- HD slot 1
    Target d
    Unit 0   Disk   SEAGATE  ST930003SSUN300G 0868    585937500 Blocks, 300 GB
    SASDeviceName 5000c5001cb42adf  SASAddress 5000c5001cb42add  PhyNum 3 <- HD slot 3

    /pci@400/pci@1/pci@0/pci@4/scsi@0             <---- SAS controller 0 (Not Used)

    FCode Version 1.00.56, MPT Version 2.00, Firmware Version 9.00.00.00

    ok

In this example, the controller ports are attached to the hard drives and the DVD in the following manner:

SAS2 Controller | Controller Port (PhyNum) | Disk Slot ID | Target |  | SAS2 Controller | Controller Port (PhyNum) | Disk Slot ID | Target
--- | --- | --- | --- | --- | --- | --- | --- | ---
0 | Not Used |  | 1 | 01 | 0 | 9
|  |  | 1 | 1 | b
|  |  | 2 | 2 | c
|  |  | 3 | 3 | d
|  |  | 6 | DVD | a

1Default boot drive

Note - Target values are not static. The same storage device can appear in two consecutive `probe-scsi-all` listings with different Target values.

The default boot device has the following values:

- Controller = 1

- Target = 9

- PhyNum = `0`

- SASDeviceName = `5000cca012b76b40`

- SASAddress = `5000cca012b76b41`

If you want to specify another drive to be the boot device, find its `PhyNum` value in the output and use the `SASDeviceName` assigned to that device. For example, if you want to use the hard drive in disk slot 2, it has the following values:

- Controller = `1`

- Target = `b`

- PhyNum = `2`

- SASDeviceName = `5000cca00a4d2ff0`

- SASAddress = `5000cca00a4d2ff1`

##### Related Information

- World Wide Name Syntax

- `probe-scsi-all` WWN Mapping Overview

- WWN Syntax in an OS Installation on an Individual Drive

- WWN Syntax in an OS Installation on a RAID Volume

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