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

Chapter 5
Modifying Input/Output (I/O) Configurations
Using the IOCONFIG Utility
123
[[DLDEV]=logical device #,...]
[[MODE =]{IN
OUT
CIO
NCIO
RANDOM
DEFAULT}]
Currently, the system allows any device in the system to belong to only one associated class at any time. For
example, if a device X belongs to a class Y and Y is associated to some user, then the MODIFYCLASS command
prevents you from adding X to another class Z which is also associated to any user at the time.
Listing One or More Device Classes with IOCONFIG
The system manager or operator can list all device classes in the system, or one or more specified device
classes, with their configuration information using the LISTCLASS or LCLASS command. When no parameter
is used with this command, all device classes currently configured in the system are listed. By providing the
names of those device classes with the CLASS keyword, you can view information about particular device
classes.
The command syntax is as follows:
LISTCLASS [[CLASS]= classname,...]
[[DEST]= OFFLINE]
Deleting a Device Class with IOCONFIG
The system manager or operator can use the DELETECLASS or DCLASS command to delete a device class that is
not currently associated to a user. To disassociate the device class from the user, the user must execute the
DISASSOCIATE command at the Command Interpreter prompt.
The command syntax is as follows:
DELETECLASS {[CLASS =] classname,...]
Configuring a Device Adapter with IOCONFIG
It is often necessary to configure intermediate paths before a device can be configured into the system. For
example, you must configure a SCSI device adapter before the first device on that SCSI bus can be configured.
Intermediate path configuration is done just like in SYSGEN. At this time, the command to delete a path is
only supported for the single-ended SCSI adapter. All other cases will fail with an error.
The command syntax is as follows:
ADDPATH {[PATH =] devicepath}{[ID =] productid]
[[PMGR =]physicalmgrname]
[[PMGRPRI =]physicalmgrpri]