System Options under z/OS

FILEBLKSIZE(device-type)= System Option: z/OS

Specifies the default maximum block size for external files.

Default:	varies by device type
Valid in:	configuration file, SAS invocation, OPTIONS statement, OPTIONS window
Category:	File Control: EXTFILES
PROC OPTIONS GROUP=	EXTFILES
z/OS specifics:	all

Syntax
Details

Syntax

FILEBLKSIZE(device-type)=value

device-type

specifies any valid specific device number, as well as DASD, DISK, OTHER, SYSOUT, TAPE, and TERM.

DASD or DISK: indicates that the specified value is to be used as the default block size for all types of tape devices.
OTHER: specifies the value that SAS uses when it is unable to determine the exact device type.
SYSOUT: sets values for SYSOUT data sets.
TAPE: sets values for the 3400, 3480, 3490E, and 3590 device types.
TERM: sets values for data sets that are directed to the terminal.

value

specifies the default block size. Valid values are

number: specifies the block size that SAS is to use for the device.
OPT: tells SAS to choose an optimum block size for the device.
MAX or FULL: tells SAS to use the maximum permitted block size for the device.
HALF, THIRD, FOURTH, or FIFTH: instructs SAS to use the largest value that results in obtaining two, three, four, and five blocks per track, respectively (if a disk device), or the maximum permitted block size divided by two, three, four, and five, respectively (if not a disk device).
MIN: specifies the same as FIFTH above.

Details

The minimum value for FILEBLKSIZE(device-type)= is 5; the maximum value is device dependent and can be obtained by using the DEFINE option in the PROC OPTIONS statement. For example:

proc options option=fileblksize(3390) define;
run;

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