You can use the OpenBoot probe-scsi-all command to probe the SCSI buses and to display information about the attached devices. The command displays the device path, device type, target, unit numbers, and the unique WWN.
Example:
{0} ok probe-scsi-all /pci@300/pci@2/usb@0/hub@4/storage@2 Unit 0 Disk smiMICRON eUSB DISK 1111 /pci@300/pci@2/usb@0/hub@3/storage@1 Unit 0 Removable Read Only device SUNRemote ISO CDROM1.01 /pci@300/pci@2/usb@0/hub@8/device@1/storage@0 Unit 0 Removable Read Only device TEAC DV-W28S-A 9.2A /pci@301/pci@2/scsi@0 FCode Version 1.00.64, MPT Version 2.05, Firmware Version 5.00.00.00 Target 9 Unit 0 Disk HITACHI H109060SESUN600G A606 1172123568 Blocks, 600 GB SASDeviceName 5000cca043d8bdf0 SASAddress 5000cca043d8bdf1 PhyNum 0 Target a Unit 0 Disk HITACHI H109060SESUN600G A606 1172123568 Blocks, 600 GB SASDeviceName 5000cca043daf4d8 SASAddress 5000cca043daf4d9 PhyNum 4