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

128 Chapter5

Modifying Input/Output (I/O) Conﬁgurations

Using the IOCONFIG Utility

With the release of version C.55.00 of MPE/iX, system managers can now use a new utility,

IOCONFIG, to change the I/O conﬁguration and implement the changes immediately

without rebooting the system.

The IOCONFIG utility automatically updates SYSGEN’s base conﬁguration. IOCONFIG

can completely replace the use of SYSGEN for device conﬁguration, especially when you

need to make conﬁguration changes immediately; that is, without rebooting the system.

However, you should continue to use SYSGEN to conﬁgure devices to have the changes

take effect at the next reboot.

There is one occasion when you cannot use IOCONFIG in place of SYSGEN’s I/O

Conﬁgurator: when the current base conﬁguration group is BOOTUP. IOCONFIG cannot

modify conﬁguration ﬁles in the BOOTUP group, since these ﬁles are designed to maintain

a backup copy of the conﬁguration ﬁles used in the last successful START NORECOVERY

which includes INSTALL and UPDATE. Therefore, when BOOTUP is the current base

conﬁguration group, you must use SYSGEN to make the conﬁguration changes on the next

START NORECOVERY.

NOTE There is another new option for online device conﬁguration introduced with

Version C.55.00 of MPE/iX. The system manager can use the I/O Conﬁgurator

in SYSGEN, and then issue the DOIONOW command to immediately begin

making the changes online. This command is described earlier in this chapter.

You may use IOCONFIG in one of two ways: interactively or non-interactively which is

sometimes called “command mode”.

To use IOCONFIG interactively, you issue the IOCONFIG command, without command

parameters, at the CI prompt. This starts the IOCONFIG utility, at which point you may

enter any of the commands shown in Table 5-6. at the special prompt. When you are

through using IOCONFIG, you must explicitly exit the utility.