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#### World Wide Name Syntax

The Oracle Solaris OS now uses the World Wide Name (WWN) syntax in place of the locally unique `t` n (target ID) field in logical device names. This change affects how a target storage device is identified when downloading the operating system over a network. The following points are key to understanding the impact of this change:

- Before the change to WWN nomenclature, the Oracle Solaris OS would ordinarily identify the default boot device as `c0t0d0`.

- With the change, the device identifier for the default boot device is now referred to as `c0t` WWN `d0`, where WWN is a hexadecimal value that is unique to this device throughout the world.

- This WWN value does not map in a predictable way to the physical address of the device to which it refers.

To reliably specify a particular storage device for an OS download operation, you must determine the correspondence between the WWN value assigned to that device and its physical location.

You can find this correspondence using either OBP or Oracle Solaris commands:

- When in OBP, run `probe-scsi-all`. See Identify a Disk Slot Using `probe-scsi-all` (OBP) for instructions.

- When in Oracle Solaris, run `format`, followed by `prtconf -v`. See Identify a Disk Slot Using `prtconf` (Oracle Solaris, Onboard Controllers) or Identify a Disk Slot Using `prtconf` (Oracle Solaris, Single Initiator) for instructions.

These commands generate information about the SAS controllers and the storage devices that are connected to them. This information includes both logical and physical names, which you can analyze to determine these logical and physical address relationships.

Note - Refer to your service manual for a description of the physical drive slot organization on your system.

##### Related Information

- `probe-scsi-all` Output Example (SPARC T3-1, Eight-Disk Backplane)

- `probe-scsi-all` Output Example (SPARC T3-1, Sixteen-Disk Backplane)

- `probe-scsi-all` Output Example (SPARC T3-4)

- Identify a Disk Slot Using `probe-scsi-all` (OBP)

- Identify a Disk Slot Using `prtconf` (Oracle Solaris, Onboard Controllers)

- Identify a Disk Slot Using `prtconf` (Oracle Solaris, Single Initiator)

- WWN Syntax in an OS Installation on a Specific Device

- WWN Syntax in an OS Installation on a RAID Volume

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