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##### `probe-scsi-all` WWN Mapping Example (SPARC T4-2)

The SPARC T4-2 server has one SAS2 RAID controller on the motherboard. This controller is connected to six slots on the disk backplane.

The following table shows the PhyNum-to-disk slot mapping for the six-slot SPARC T4-2 backplane.

Table 6 SAS2 Controller Port Mapping for the SPARC T4-2 Disk Backplane

SAS2 Controller | Controller Port (PhyNum) | Disk Slots and DVD
--- | --- | ---
0 | 0 | 01
| 1 | 1
| 2 | 2
| 3 | 3
| 4 | 4
| 5 | 5
| 6 | Not connected
| 7 | DVD

1Default boot drive

The following example is based on a SPARC T4-2 server with six hard drives. These hard drives are deployed as four individual storage devices and a virtual drive that consists of two hard drives configured as a RAID volume. The controller is attached to these devices in the following manner:

- Targets 9, d, e, and f (four individual storage devices).

- Target 389 (a RAID volume).

- Target a (a DVD unit).

    ok probe-scsi-all
    /pci@400/pci@2/pci@0/pci@4/scsi@0                        <---- SAS controller

    FCode Version 1.00.56, MPT Version 2.00, Firmware Version 9.00.00.00

    Target 9
      Unit 0   Disk   SEAGATE  ST930003SSUN300G 0868 585937500 Blocks, 300 GB
      SASDeviceName  5000c5001cb4a637  SASAddress  5000c5001cb4a635  PhyNum 0
    Target a
      Unit 0   Removable Read Only device   TEAC    DV-W28SS-R      1.0C
      SATA device  PhyNum 7
    Target d
      Unit 0   Disk   HITACHI  H103030SCSUN300G A2A8    585937500 Blocks, 300 GB
      SASDeviceName  5000c5001cb477cb  SASAddress  5000c5001cb477c9  PhyNum 1
    Target e
      Unit 0   Disk   SEAGATE  ST930003SSUN300G 0B70    585937500 Blocks, 300 GB
      SASDeviceName  5000c5001cb47f93  SASAddress  5000c5001cb47f91  PhyNum 2
    Target f
      Unit 0   Disk   SEAGATE  ST930003SSUN300G 0B70    585937500 Blocks, 300 GB
      SASDeviceName  5000c5001cb47f7f  SASAddress  5000c5001cb47f7d  PhyNum 3
    Target 389 Volume 0
      Unit 0   Disk   LSI     Logical Volume   3000   583983104 Blocks,   298 GB
      VolumeDeviceName 3ce534e42c02a3c0   VolumeWWID 0ce534e42c02a3c0

    /pci@400/pci@1/pci@0/pci@b/pci@0/usb@0,2/hub@2/hub@3/storage@2
      Unit 0   Removable Read Only device    AMI     Virtual CDROM    1.00

    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
--- | --- | --- | ---
0 | 0 | 01 | 9
| 1 | 1 | d
| 2 | 2 | e
| 3 | 3 | f
| 4 | 4 | RAID Target 389
| 5 | 5 | RAID Target 389
| 6 | Not connected | --
| 7 | 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 = 0

- Target = 9

- PhyNum = `0`

- SASDeviceName = `5000c5001cb4a637`

- SASAddress = `5000c5001cb4a635`

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 3, it has the following values:

- Controller = `0`

- Target = `f`

- PhyNum = `3`

- SASDeviceName = `5000c5001cb47f7f`

- SASAddress = `5000c5001cb47f7d`

##### 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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