CA Dynam for VSE User Guide

Changing File Characteristics
CA Dynam/FI Operands
The remaining operands are as follows:
BLKSZ= Specifies the block size for the file. It is either a decimal number between 1
and 65535, or the keyword OPTIMIZE (or OPT). If you use OPTIMIZE, CA
Dynam/FI recalculates the block size for the physical unit on which the data
set resides.
When BLKSZ=OPT is specified, CA Dynam/FI uses the OPTBLKS value defined
in the DYNAM/FI option record for tape files during the installation procedure.
Before a file can be used as input with this specification, it must first be
created with the BLKSZ=OPT option. Indeed, if a file is created with CA
Dynam/FI OPT blocking, then when the file is processed for input, either OPT
or the correct numeric block size must be used. If you specify neither,
unpredictable results will occur.
Default: Block size defined in the Catalog or else block size in the user's
program.
CONCAT
Specifies that this file is to be concatenated with another file.
When CONCAT is specified, a single open can be used to read two (or more)
input files. Specify CONCAT on the label of each file to be concatenated,
except for the last one to be read.
CONCAT=ALL, CONCAT=nn
CONTACT=ALL may be specified to concatenate all versions of a data set. Use
CONCAT=nn to concatenate the first nn versions of a data set.
FIOPT=(options)
Specifies CA Dynam/FI options. Options may be listed in any order, separated
by commas and enclosed in parentheses.
AUDIT
NOCNTRL
NORELSE
NOTM
Instructs CA Dynam/FI to monitor processing of this file
even though nothing is to be changed (for information
about the processing of the file.)
Ignores CNTRL requests for this file. For more information
about CNTRL macro, see the IBM Supervisor And I/O
Macro manual.
Ignores RELSE requests for this file. For more information
about RELSE macro, see the IBM Supervisor And I/O
Macro manual.
Does not write tape mark at close. Default: Tape mark
written at close
6–12 User Guide