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

Chapter 5
Modifying Input/Output (I/O) Configurations
Using the IOCONFIG Utility
122
Deleting a Device with IOCONFIG
The system manager or operator may delete a device from the configuration using the DELETEDEVICE or DDEV
command. A device is considered to be completely deconfigured when all its system-related resources are
recovered. DDEV, at this time, can only deconfigure two kinds of devices completely: network printers and
disks that are attached to single-ended SCSI adapters.
The syntax of the DDEV command is identical to that of SYSGEN’s DDEV command in IO level. The command
syntax is as follows:
DELETEDEVICE {[LDEV =]#/#,#,...}
[[ID =]deviceid]
[[TYPE =]devicetype]
[[CLASS =]classname]
Adding a Device Class with IOCONFIG
To create a new device class in the system, the system manager or operator uses the ADDCLASS or ACLASS
command. The syntax of the ACLASS command is identical to that of ACLASS in SYSGEN. All devices that you
designate as members of the class (using the LDEV parameter) must be configured before issuing this
command.
NOTE With the release of version C.55.00 of MPE/iX, the maximum number of devices that you can
configure has substantially increased. When there is a large number of configured devices, you
may notice a slight delay in system response as you add more. For example, when the number
of devices configured exceeds approximately 2,000, the delay will be evident. It is not, however,
indicative of a system problem.
The syntax of the ADDCLASS command is as follows:
ADDCLASS {[CLASS =]classname}{[LDEV =]#/#,#,...}
[[MODE =]{IN
OUT
CIO
NCIO
RANDOM
DEFAULT}]
Modifying a Device Class with IOCONFIG
The system manager or operator can modify a device class by adding or deleting one or more devices in it or
by renaming it using the MODIFYCLASS or MCLASS command. The syntax of this command is identical to that of
MCLASS in SYSGEN. The command syntax is as follows:
MODIFYCLASS {[CLASS]=classname}
[[NEWCLASS]=classname]
[[ALDEV]=logical device #,...]