Specifying LOAD information

From the system console facility of the hardware management console, operators can specify the device number of the volume for the input/output definition file (IODF), select a LOADxx member, and control the display of messages and system prompts during initialization.

The operator can specify the following values to initialize the system control program:

The device number of the volume where the IODF, a VSAM data set that manages system configuration data, resides. This is also the device on which the search for the LOADxx member of SYSn.IPLPARM or SYS1.PARMLIB begins. For information about IODF and SYSn.IPLPARM, see z/OS HCD Planning and z/OS MVS Initialization and Tuning Reference.
The LOADxx member of SYS1.PARMLIB or SYSn.IPLPARM (see z/OS MVS Initialization and Tuning Reference for a detailed description of LOADxx).
The initialization message suppression indicator (IMSI) that controls the suppression of messages and system prompts during initialization.
The alternate nucleus. (This specification overrides the value specified for the alternate nucleus in LOADxx.)

LOADxx allows you to specify I/O configuration data and information about the IODF data set, the nucleus, the master catalog, and the IEASYMxx and IEASYSxx parmlib members. For information about those parmlib members, see z/OS MVS Initialization and Tuning Reference. For information about the IODF data set, see z/OS HCD Planning.

Using LOADxx is a good way to automate the initialization procedure for your system and simplify the process for your operators.

The IMSI character tells the system whether or not to do the following during system initialization:

Display most informational messages.
Prompt for system parameters.
Prompt for the name of the master catalog.

See the topic on loading the system software in z/OS MVS System Commands for a table that shows the possible values for the IMSI character. The values indicate all possible combinations of the actions listed above.