System Startup, Configuration, and Shutdown Reference Manual (32650-90892)

126 Chapter5
Modifying Input/Output (I/O) Configurations
Using the SYSGEN I/O Configurator
Deleting Objects in SYSGEN
When you use SYSGEN to delete objects from the system configuration, there are four I/O
Configurator commands available to you: DCLASS, DDEV, DPATH, and DVOL. They are
defined in Table 5-5. and explained in the following sections.
Changing the Configuration Online
A new command file, DOIONOW, has been added to MPE/iX which allows the system
manager to immediately implement device configuration changes made with SYSGEN.
This command allows you to keep the system online and available to users more of the
time, and gives you the flexibility to change the configuration on an “as needed” basis.
To change the configuration while the system is online, do the following:
1. Make the necessary changes to the configuration with the I/O Configurator. (This
process is no different than it was before; for more information, read the previous
section of this chapter “Using SYSGEN’s I/O Configurator.”
2. Keep the configuration changes and exit SYSGEN. The information is saved in the file
LOG4ONLN.PUB.SYS, which is used by the DOIONOW command.
3. At the CI prompt, execute the DOIONOW command by entering:
:DOIONOW
4. DOIONOW passes the LOG4ONLN file, which contains the new configuration
information, to IOCONFIG, which begins making the changes. If LOG4ONLN is not
found, you will see the following error message displayed on the console:
Table 5-5. I/O Configurator Delete Commands
Command Definition Examples
DCLASS Removes one or more class names from the system. If
the class does not exist, or if you attempt to delete the
DISC, CONSOLE, or TAPE classes, SYSGEN displays
an error message
DCLASS EPOC
DCLASS
(EPOC,FASTLP)
DDEV Removes a specific device, range of devices, all
products of a given product identification, all devices of
a given type, or all devices of a given class name. You
cannot delete the system disk (LDEV 1) or the system
console (LDEV 20).
DDEV LDEV=123
DDEV ID=HP2932A
DPATH Deletes an I/O path and, optionally, all the I/O paths
below it in the configuration. If there are I/O paths
below the one you are deleting, SYSGEN prompts you
to confirm the action before deleting them. If an I/O
path is currently used by a configured device,
SYSGEN issues an error and does not delete the path.
DPATH 4.2
PATH 2/8.2
DVOL Deletes a volume member from the system
configuration. To implement the change, you must
create a system load tape with the new configuration
and then use it to do an INSTALL.
DVOL MEMBER2