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##### `probe-scsi-all` WWN Mapping Overview

The output displayed by `probe-scsi-all` lists all SCSI devices in the server and provides a basic set of information about each device. When analyzing the `probe-scsi-all` output, look for the following data fields:

Entity Name | Definition
--- | ---
Target | Each SAS or SATA drive is assigned a unique Target ID.
SASDeviceName | This is the WWN value assigned to a SAS drive by the manufacturer. The Oracle Solaris OS recognizes this name.
SASAddress | This is the WWN value assigned to a SCSI device that is recognized by the OBP firmware.
PhyNum | This is a hexidecimal ID of the controller port that is attached to the target drive.
VolumeDeviceName (when a RAID volume is configured) | This is the WWN value assigned to a RAID volume that is recognized by Oracle Solaris OS. The `VolumeDeviceName` replaces the `SASDeviceName` of every SCSI device contained in the RAID volume. Use the `VolumeDeviceName` entitiy to determine the correct target in a RAID volume, or when the server is configured with an optional internal RAID HBA controller.
VolumeWWID (when a RAID volume is configured) | This is the WWN-based value assigned to a RAID volume that is recognized by the OBP firmware. `VolumeWWID` replaces the `SASAddress` of every SCSI device contained in the RAID volume.

At a high level, the WWN mapping process consists of the following stages:

- Identify the physical location of the hard drive that is to be the target of the operation.

- Then identify the controller port that is attached to that physical location.

- Finally, find the WWN-based device name of the drive attached to that controller port.

Examples of this process are provided for each of the SPARC T4 server models:

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

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

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

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

- SPARC T4-4 with four CPUs -- `probe-scsi-all` WWN Mapping Example (SPARC T4-4 With Four CPUs)

- SPARC T4-4 with two CPUs -- `probe-scsi-all` WWN Mapping Example (SPARC T4-4 With Two CPUs)

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

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

##### Related Information

- World Wide Name Syntax

- Identify a Disk Slot Using `prtconf` (Oracle Solaris OS)

- WWN Syntax in an OS Installation on an Individual Drive

- WWN Syntax in an OS Installation on a RAID Volume

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