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SYSn.IPLPARM is an optional partitioned data set that contains LOADxx members that point to I/O definition files (IODFs) that reside on the same volume as SYSn.IPLPARM. (Character "n" is a single numeral, 0 through 9.)

This volume should contain only one SYSn.IPLPARM data set and its associated IODFs.

If used, must reside on the same DASD as the IODF data set.

For allocation, specify the following DCB subparameters on the DD statement:
RECFM=FB
LRECL=80
BLKSIZE=0

SYSn.IPLPARM is particularly useful in a multi-system environment. You can use one SYSn.IPLPARM data set for each system. On each system, the SYSn.IPLPARM data set must be on the volume where the production IODF for that system resides.

You specify the name of your production IODF in a LOADxx member. You can place LOADxx members in either the SYSn.IPLPARM or SYS1.PARMLIB data set. Your choice determines the volume on which you can place that data set. Your choice also determines on which volume you place the production IODFs pointed to by the LOADxx members.

The LOADxx member must point to a production IODF. If you place the LOADxx members in SYSn.IPLPARM, you must place the production IODFs on the same volume as SYSn.IPLPARM. In this case, you can place SYS1.PARMLIB on any volume.