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

Chapter 5 117
Modifying Input/Output (I/O) Configurations
5 Modifying Input/Output (I/O)
Configurations
With the introduction of version C.55.00 of MPE/iX, there are two ways to define input and
output devices on a system: using SYSGEN’s I/O Configurator or using the IOCONFIG
utility. Both methods provide information about the input and output devices configured
on a system and let you make changes to the configuration as necessary. The key difference
is that using IOCONFIG changes the configuration while the system remains online,
whereas to activate configuration changes made with SYSGEN, you must issue a separate
command (DOIONOW) after making the changes, or reboot the system with the START
NORECOVERY option, or generate a new System Load Tape to update this (or another)
system.
SYSGEN’s I/O configurator and the IOCONFIG utility configure the local devices of the
system only. Remote devices, such as terminals on a distributed terminal subsystem and
remote serial printers, are configured through the network management configurator.
This chapter begins with a general discussion of I/O paths and then explains how to
configure devices using SYSGEN and the IOCONFIG utility. For additional information,
read Chapter 3 of the Performing System Manager Tasks manual.