Configuring HP-UX For Peripherals

Chapter 1 27

Getting Started

Viewing the System Conﬁguration with ioscan

The length of these numerical sequences differ by system model and

architecture, but every hardware path leads you through the bus

structure, starting from the bus closest to the system processor and

ending at the output device.

ioscan -H

hardware_path

shows you the sequence of connection to or

from the speciﬁed location. In the following example, which displays

output from a Model 770, a disk attached to the GSC built-in Fast/Wide

SCSI Interface has the hardware address 8/0.5.0.

/usr/sbin/ioscan -H 8/0.5.0

H/W Path Class Description

====================================================

8 bc I/O Adapter

8/0 ext_bus GSC built-in Fast/Wide SCSI Interface

8/0.5 target

8/0.5.0 disk DEC DSP3210SW

The hardware path can be decoded as follows:

8 identiﬁes the bus adapter connecting the GSC+ bus to

the system bus.

0 identiﬁes the slot number of the Fast/Wide SCSI

interface. (See Figure B-3 in Appendix B, Bus

Architectures.)

5 represents the "target," or SCSI address, set on the

disk device itself.

0 indicates a unit number or SCSI LUN number.

Field separators slash (/) and dot (.) separate the numbers of the

hardware address and have no bearing on system administration. The

displayed classes are more meaningful in the context of instance

numbers, which are visible in ioscan -f listings, and will be discussed

shortly. Explanation of hardware addresses on multi-function cards is in

Appendix B , “Bus Architectures.”

Understanding the Description in ioscan

The description ﬁeld displayed by ioscan derives from the peripheral

device itself. Typically, a numeric description refers to the

manufacturer's vendor ID, and in some cases, this number corresponds

to more than one model number. If you are troubleshooting a peripheral’s

problem, the description is often useful information to an HP support