System Startup, Configuration, and Shutdown Reference Manual (32650-90907)

Chapter 5
Modifying Input/Output (I/O) Configurations
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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.