HP 3000 Manuals HP 3000 Manuals
Overview
SYSGEN is an MPE XL program that creates configuration files for a target
system. The configuration can be an image of the current system, a
partial image, or a new or modified base system for generating a boot
tape. The utility requires that the user has system supervisor (OP)
capability to view system configuration data and system manager (SM)
capability to save changes or create a boot tape. SYSGEN contains a
global module, a primary menu, and four configurators:
* Input/Output (I/O) 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 a boot tape. In addition, the SYSFILE configurator changes a copy
of the Compatibility Mode Segmented Library (CMSL), which can then be
dumped in place of the original Segmented Library (SL).
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
identifiable. 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. The 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 via 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.
SYSGEN stores modified or newly created disk resident configuration
groups in the SYS account. When KEEP is used to save changes to a new
group name, SYSGEN stores the modified basegroup files in a group in the
SYS account. The changes take effect once the system is regenerated or
rebooted.
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, used to start a system. For more information on the
START utility, refer to chapter 2, "System Startup."