Changing active I/O software configuration for z/OS virtual server instances
The Hardware Configuration Definition (HCD) component of z/OS consolidates the hardware and software I/O configuration processes under a single interactive user interface. The output of HCD is an I/O definition file (IODF), which contains I/O
configuration data. An IODF is used to define multiple software configurations to the z/OS virtual server instance. The IODF
PROV.IODF00 exists in the z/OS stock image. The corresponding data sets are on volume
OPEVS1 with device
If you want to change the active I/O configuration, you need to use one of the following methods to activate the IODF.
Note: z/OS stock images always IPL with
LOADK2 found in
SYS0.IPLPARM. The IODF statement identifies the I/O definition file that contains information about the I/O configuration,
which means you need to specify the IODF statement so that the corresponding I/O configurations will be used at IPL. You must follow the IODF statement policies for the z/OS virtual server instance:
- The IODF suffix is part of the IODF name. The range value is a two-digit hexadecimal number (X'00-FF').
- Asterisks (**), pluses (++), minuses (--), and equals (=) in IODF suffix are not supported for z/OS virtual server instances.
- The IODF high-level qualifier needs to be specified explicitly.
- The subchannel set indicator needs to be specified as
- The specified IODF needs to reside on the IODF disk device
For more information, see Statements and parameters for LOADxx .