HP 3000 Manuals HP 3000 Manuals
Chapter 4 Using the System Generator (SYSGEN)
SYSGEN is a utility used to modify the system configuration. System
configuration changes are kept to disk in a configuration group or to a
tape called a system load tape (SLT). The SYSGEN utility requires system
supervisor (OP) capability to view system configuration and system
manager (SM) capability to save changes or create an SLT.
SYSGEN contains a global module and four configurators:
* Input/Output (IO) Configurator. Configures the local devices for
the target system.
* Logging (LOG) Configurator. Changes the attributes of the user
logging and system logging processes.
* Miscellaneous (MISC) Configurator. Focuses on system limits and
startup values, especially those related to jobs, sessions, and
processes.
* System File (SYSFILE) Configurator. Changes the list of files
dumped to an SLT.
Each configurator provides an interface to make changes to an independent
portion of the configuration data and offers a menu of commands and
online syntax help. Command names and abbreviations are easily
identified. For example, the command to add a device is ADEV
(abbreviated AD), while the command to delete a device is DDEV
(abbreviated DD).
The configurators operate on information contained in the base
configuration group. This basegroup is the group used to begin making
changes to the system configuration. The basegroup includes a permanent
set of configuration files that contain information on device classes,
assigned I/O paths, assigned logical device (LDEV) numbers, current
volume names, and various other system parameters.
Activating SYSGEN creates a set of temporary configuration files that
correspond to the permanent file set specified with the BASEGROUP
command. Configuration changes are made to the temporary configuration
files. Once the changes are complete, the system manager uses the KEEP
command to overwrite the permanent file set with the temporary file set
or to save the temporary files to another permanent file set.
When KEEP is used to save changes to a new group name, SYSGEN stores the
modified base group files in a group in the SYS account. The changes
take effect once the system is rebooted with START NORECOVERY.
SYSGEN also provides a CLEAR command to erase changes made through one or
more of the configurators.
NOTE When SYSGEN generates a boot tape, it writes the current
configuration data as the group CONFIG.SYS, regardless of the group
name on disk. CONFIG is the group selected by default by the START
utility and used to start a system. For more information on the
START utility, refer to Chapter 3 .