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.
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 | 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 “System Startup Functions”. |
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