HP 3000 Manuals HP 3000 Manuals
Configuring Devices
There are two general categories of devices that you configure on your
computer system, local and non-local devices.
* Local devices are "hard-wired" or connected via parallel cables to
your computer. These include tape and disk drives and some
printers. You configure local devices with SYSGEN's IO
configurator utility.
* Non-local devices are connected via Datacommunication and Terminal
Controllers, or DTCs. These include terminals, PCs in terminal
emulation mode, serial printers and Uninterruptible Power Supply
(UPS) units. You configure non-local devices with the Node
Management Services Configuration Manager (NMMGR) program.
This section explains how to configure local devices. It also explains
how to configure UPS devices (which are non-local devices) and how to use
the UPS Monitor/iX software. For more information about using NMMGR to
configure all other non-local devices, read Configuring Systems for
Terminals, Printers, and Other Serial Devices (32022-90001).
To identify local devices to the system
There are certain attributes of local devices that you are required to
configure because they identify the device to the system. These include
the device identification number (ID), the I/O path, and the logical
device number (LDEV). Each of these attributes is introduced below.
* The device identification is the product identification number
(for example HP7978B or HP2563A) of the device you are adding.
The file IODFAULT.PUB.SYS contains configuration information for
all devices supported by Hewlett-Packard. If your product ID
number is not listed in this file, you may wish to contact your
customer engineer. For nonsupported devices, the ID is always
USER and you must specify all attributes except class, class mode
and device name.
* An I/O path is the system address assigned to the device interface
hardware and software and the physical path used to reach an I/O
device. To add, change, or delete a path, you must correctly
identify the applicable device adapter interfaces and their
associated I/O devices.
At system power ON or RESET, the processor-dependent code (PDC)
and I/O-dependent code (IODC) hardware routines read and
initialize the I/O paths to boot or reboot the system. The I/O
paths that the system uses to load itself from disk or tape are
referred to as boot paths.
For more information about I/O paths, refer to the System Startup,
Configuration, and Shutdown Reference Manual (32650-90042).
* Each configured device is identified by a unique logical device
number, or LDEV. You assign logical device numbers to all system
devices except LDEV 1 (which is always the system master disk) and
LDEV 20 (which is always the console).
To configure default device attributes
There are additional attributes for local devices that you can or must
leave set to the default. They include device type, associated output
device, device mode and device class, which are described next. A number
of other attributes that you can configure are explained throughout this
chapter.
* A logical device is identified by its type, which you cannot
change. Device types names are standardized, and each logical
device may be only one type. Be careful not to confuse type with
class.
Standard device types are:
DISC disk drives
TAPE tape drives
TERM terminals
LP line printers
PP page printers
AC autochanger
* The output device tells where output from a device goes. It is
either a logical device (LDEV) number or a device class. Only
devices that can accept HELLO, JOB or DATA logons require an
output device.
For the console and terminals, the output device is the same as
its LDEV. All terminals are both input and output devices and are
referred to by one LDEV number. For the job tape (or streams
device), the output device is usually LP. For printers and disks,
the output device is zero.
* An I/O device may operate in one or more modes such as JOB (which
means it accepts job and session logons) or INPUT (which means
that input to the device is spooled).
* The device class is a name used to identify a group of devices by
location (for example, BLDG2) or ownership (for example, FINANCE).
They can also be used to call for a device when you do not know an
LDEV number or when it is okay to use any device in that class.
(For example, you can specify the printer class BONSAI if you want
a report printed on any HP 2688A printer.)
A device can simultaneously belong to as many as eight classes.
If you specify a class name that does not exist, it is assigned
default characteristics. Some functions require a device in
specific classes.