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

The SPARC T4-1 server has two SAS2 RAID controllers on the motherboard. Each controller is connected to four slots on the disk backplane. The following table shows the PhyNum-to-disk slot mapping for the eight-slot SPARC T4-1 backplane.

Table 4 SAS2 Controller Port Mapping for the SPARC T4-1 Disk Backplane

SAS2 Controller | Controller Port (PhyNum) | Disk Slot |  | SAS2 Controller | Controller Port (PhyNum) | Disk Slot
--- | --- | --- | --- | --- | --- | ---
0 | 0 | 01 |  | 1 | 0 | 4
| 1 | 1 |  |  | 1 | 5
| 2 | 2 |  |  | 2 | 6
| 3 | 3 |  |  | 3 | 7

1Default boot drive

This table shows that ports 0-3 of controller 0 are connected to backplane slots 0-3 and ports 0-3 of controller 1 are connected to slots 4-7.

The following example is based on a SPARC T4-1 server with eight hard drives. These hard drives are deployed as six individual storage devices and a virtual drive. The virtual drive consists of two hard drives configured as a RAID volume. Controllers 0 and 1 are attached to these storage devices in the following manner:

- Controller 0 is attached to Targets 9 and b (two individual storage devices).

- Controller 0 is also attached to Target 523 (a RAID volume).

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

- Controller 1 is also attached to Target a (a DVD unit).

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

    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   SEAGATE  ST930003SSUN300G 0B70    585937500 Blocks, 300 GB
      SASDeviceName 5000c5001d33fba7  SASAddress 5000c5001d33fba5  PhyNum 0
    Target a
      Unit 0   Removable Read Only device   TEAC    DV-W28SS-R      1.0C
      SATA device  PhyNum 6
    Target b
      Unit 0   Disk   HITACHI  H103030SCSUN300G A2A8    585937500 Blocks, 300 GB
      SASDeviceName 5000cca00a76e380  SASAddress 5000cca00a76e381  PhyNum 1
    Target c
      Unit 0   Disk   SEAGATE  ST930003SSUN300G 0B70    585937500 Blocks, 300 GB
      SASDeviceName 5000cca00a76ddcc  SASAddress 5000cca00a76ddcd  PhyNum 2
    Target d
      Unit 0   Disk   HITACHI  H106060SDSUN600G A2B0    1172123568 Blocks, 600 GB
      SASDeviceName 5000cca01201e544  SASAddress 5000cca01201e545  PhyNum 3

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

    FCode Version 1.00.56, MPT Version 2.00, Firmware Version 9.00.00.00

    Target 9
      Unit 0   Disk   HITACHI  H103030SCSUN300G A2A8    585937500 Blocks, 300 GB
      SASDeviceName 5000cca00a75dcac  SASAddress 5000cca00a75dcad  PhyNum 0
    Target a
      Unit 0   Disk   SEAGATE  ST930003SSUN300G 0B70    585937500 Blocks, 300 GB
      SASDeviceName 5000c5001d33eb5f  SASAddress 5000c5001d33eb5d  PhyNum 1
    Target 523 Volume 0
      Unit 0   Disk   LSI     Logical Volume   3000   583983104 Blocks,   298 GB
      VolumeDeviceName 3ce534e42c02a3c0   VolumeWWID 0ce534e42c02a3c0

    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 | 0 | 01 | 9 |  | 1 | 0 | 4 | 9
| 1 | 1 | a |  |  | 1 | 5 | b
| 2 | 2 | RAID Target 523 |  |  | 2 | 6 | c
| 3 | 3 | RAID Target 523 |  |  | 3 | 7 | 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 = 0

- Target = 9

- PhyNum = `0`

- SASDeviceName = `5000cca00a75dcac`

- SASAddress = `5000cca00a75dcad`

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 5, it has the following values:

- Controller = `1`

- Target = `b`

- PhyNum = `1`

- SASDeviceName = `5000cca00a76e380`

- SASAddress = `5000cca00a76e381`

##### 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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