Appendix B 145
SCSI Connections
Assigning SCSI Device IDs
Assigning SCSI Device IDs
Before assigning a SCSI device ID to a new SCSI device, you need to determine which
SCSI device IDs are available. To view the SCSI IDs already in use, type the following
command at the prompt and press [Enter]:
/usr/sbin/ioscan -f
After a few moments, the ioscan utility lists all of the I/O devices it could find. The list
appears similar to the following:
Class I H/W Path Driver S/W State H/W Type Description
============================================================================
bc 0 root CLAIMED BUS_NEXUS
bc 1 10 ccio2 CLAIMED BUS_NEXUS I/O Adapter
ba 0 10/0 ROPEtoPCI CLAIMED BUS_NEXUS PCI Bus Bridge - ROPEtoPCI
graphics 0 10/0/1/0 graph3 CLAIMED INTERFACE PCI(103c1005)
lan 0 10/0/12/0 btlan3 CLAIMED INTERFACE PCI(10110019)
audio 0 10/0/13/0 audio CLAIMED INTERFACE Built-in Audio
ext_bus 0 10/0/14/0 side CLAIMED INTERFACE PCI(100b0002)
target 0 10/0/14/0.0 tgt CLAIMED DEVICE
disk 0 10/0/14/0.0.0 sdisk CLAIMED DEVICE HITACHI CDR-8435 CDROM
target 0 10/0/14/0.7 tgt CLAIMED DEVICE
ctl 0 10/0/14/0.7.0 sctl CLAIMED DEVICE Initiator
ba 1 10/0/14/1 superio CLAIMED BUS_NEXUS PCI Core I/O Adapter
tty 0 10/0/14/1/1 asio0 CLAIMED INTERFACE Built-in RS-232C
tty 1 10/0/14/1/2 asio0 CLAIMED INTERFACE Built-in RS-232C
ext_bus 1 10/0/14/1/3 SCentIf CLAIMED INTERFACE Built-in Parallel Interface
pc 0 10/0/14/1/4 siofdc CLAIMED INTERFACE Built-in Floppy Drive
floppy 0 10/0/14/1/4.1 sioflop CLAIMED DEVICE HP_PC_FDC_FLOPPY
usb 0 10/0/14/2 hcd CLAIMED INTERFACE Built-in USB Interface
usbhub 0 10/0/14/2.1 hub CLAIMED DEVICE USB Root Hub
ext_bus 2 10/0/15/0 c720 CLAIMED INTERFACE Ultra2 Wide SCSI Dual Port
target 1 10/0/15/0.7 tgt CLAIMED DEVICE
ctl 1 10/0/15/0.7.0 sctl CLAIMED DEVICE Initiator
ext_bus 3 10/0/15/1 c720 CLAIMED INTERFACE Ultra2 Wide SCSI Dual Port
target 2 10/0/15/1.6 tgt CLAIMED DEVICE
disk 0 10/0/15/1.6.0 sdisk CLAIMED DEVICE SEAGATE ST39102LC
target 3 10/0/15/1.7 tgt CLAIMED DEVICE
ctl 2 10/0/15/1.7.0 sctl CLAIMED DEVICE Initiator
ba 2 10/1 ROPEtoPCI CLAIMED BUS_NEXUS PCI Bus Bridge - ROPEtoPCI
ba 3 10/2 ROPEtoPCI CLAIMED BUS_NEXUS PCI Bus Bridge - ROPEtoPCI
ba 4 10/4 ROPEtoPCI CLAIMED BUS_NEXUS PCI Bus Bridge - ROPEtoPCI
ba 5 10/6 ROPEtoPCI CLAIMED BUS_NEXUS PCI Bus Bridge - ROPEtoPCI
processor 0 32 processor CLAIMED PROCESSOR Processor
processor 1 34 processor CLAIMED PROCESSOR Processor
Assigning External SCSI Device IDs
You can determine which SCSI devices are currently in use by looking under the H/W Path
heading in the output from the ioscan command. The entry 10/0/15/0 is the built-in SCSI
bus. For devices connected to the built-in SCSI bus, such as disks, the number between the
two decimals and after the third “/” in the hardware path specifies the SCSI ID for that
device. For example, a hardware path of 10/0/15/0.2.0 specifies an SCSI device at SCSI ID
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