System Options under z/OS

FILESEQDSNTYPE System Option: z/OS

Specifies the default value that is assigned to DSNTYPE when it is not specified with a FILENAME statement, a DD statement, or a TSO ALLOC command.

Default:	NONE
Valid in:	configuration file, SAS invocation, OPTIONS statement, SAS System OPTIONS window
Category:	File Control: EXTFILES
PROC OPTIONS GROUP=	EXTFILES
z/OS specifics:	all

Syntax

FILESEQDSNTYPE=BASIC | LARGE | EXTREQ | EXTPREF | NONE

BASIC: specifies that the system selects the BASIC format if the data set is sequential (DSORG=PS or PSU), or if DSORG is omitted from all sources and the data set is not VSAM. The data set cannot exceed 65535 tracks per volume.
LARGE: specifies that the system selects the LARGE format if the data set is sequential (DSORG=PS or PSU), or if DSORG is omitted from all sources and the data set is not VSAM. The data set can exceed 65535 tracks per volume.
EXTREQ: specifies that the data set is in the EXTENDED format if the data set is VSAM, sequential, or if DSORG is omitted from all sources. The assignment fails if the system cannot allocate an extended format data set.
EXTPREF: specifies that the data set is in the EXTENDED format if the data set is VSAM, sequential, or if DSORG is omitted from all sources. If extended format is not possible, then the system will select the BASIC format.
NONE: specifies that the default DSNTYPE of the system should be used when a new sequential file is allocated.

This option is valid for z/OS V1R7 systems and later.