Defining a PDSE

This topic shows how to define a PDSE. The DSNTYPE keyword defines either a PDSE or PDS. The DSNTYPE values follow:

LIBRARY (defines a PDSE)
PDS (defines a partitioned data set)

To define PDSE data set types, specify DSNTYPE=LIBRARY in a data class definition, a JCL DD statement, the LIKE keyword, the TSO ALLOCATE command, or the DYNALLOC macro.

Your storage administrator can assign DSNTYPE=LIBRARY in the SYS1.PARMLIB member IGDSMSxx as an installation default value. If the installation default is DSNTYPE=LIBRARY, specify DSORG=PO or DIR space in the JCL or data class definition to allocate the data set as a PDSE (you do not need to specify DSNTYPE in this case).

The following parameters are both required to allocate a PDSE:

Specify DIR space (greater than zero) or DSORG=PO (partitioned organization) in the JCL, in the DYNALLOC macro, in the data class, or in the TSO ALLOCATE command.
Specify DSNTYPE=LIBRARY in the JCL, in the data class, in the TSO ALLOCATE command, using the LIKE keyword, or as the installation default specified in SYS1.PARMLIB.

Recommendation: If you do not want to allocate the data set as a PDSE, but the data class definition set up in the ACS routine specifies DSNTYPE, override it in one of two ways:

By specifying a data class without the DSNTYPE keyword (in the JCL DD statement or ISMF panel).
By specifying DSNTYPE=PDS in the JCL DD statement, data class, LIKE keyword, or ALLOCATE command.

When you create a data set and specify the number of directory entries or DSORG=PO or the data class has DSORG=PO without being overridden, SMS chooses whether it will be a PDS or PDSE. SMS uses the first source of information in the following list:

DSNTYPE=PDS or DSNTYPE=LIBRARY (for a PDSE) in JCL or dynamic allocation.
DSNTYPE of PDS or LIBRARY in data class.
Installation default (in IGDSMSxx member if SYS1.PARMLIB).
PDS.

An error condition exists and the job is ended with appropriate messages if the DSNTYPE keyword was specified in the JCL, but the job runs on a processor with a release of MVS that does not support the JCL keyword DSNTYPE. Message IEF630I is issued.