CA Dynam for VSE User Guide

Processing Predefined Multifile Volume Data Sets
• Suppose file three ends on volume one. When you create file four,
CA Dynam/T calls for volume one and correctly positions the tape.
You can issue the ACCEPT override for multifile data sets in response to the
CADT004D MOUNT message (not the CADT005D WRONG TAPE message):
ACCEPT DSN='data set name',VER=nnn
ACCEPT DSN='data set name',VOL=nnnnnn
This ensures that the correct multifile version is read. Correct positioning can
be performed only through the Catalog definition for multifile versions.
Processing Without Additional Positioning
When opening tape files that are members of a multifile set, CA Dynam/T
modifies the DTF to NOREWIND. The file can subsequently be processed
without additional positioning, so that you can process files as multifile data
sets even if they were not originally so intended. Use any of the tape
positioning options on the TLBL or in the Catalog to override the default
specification.
Assure maximum efficiency by carefully planning multifile data set processing
and applying the appropriate TLBL options. Although CA Dynam/T makes sure
that the tape is correctly positioned and the proper file read when requested,
excessive time may be spent rewinding and forward-spacing the tape.
Example:
Creating a multifile-volume data set
BG // JOB ARDESCUP
DATE 01/22/00,CLOCK 20/34/09
BG // TLBL TAPEOUT,'AR DESC 1',,,,,,24
BG // TLBL TAPEOUT,'AR DESC 2',,,,,,2
BG // EXEC MSTROUT
BG CADT007I **** LABEL TAPEOUT SYS011=299 100723 1 *AR DESC 1*
BG CADT031I *CLOSED* TAPEOUT SYS011=299 100723 AR DESC 1 BLK=12
BG // EXEC MSTROUT
BG CADT023I **** DSN 'AR DESC 2' FILE NO. 2 BEING CREATED ON TAPE
100723 299
BG CADT031I *CLOSED* TAPEOUT SYS011=299 100723 AR DESC 2 BLK=5
BG EOJ ARDESCUP
DATE 01/22/00,CLOCK 20/34/32,DURATION 00/00/22
BG // JOB ARDESCUP
DATE 01/22/00,CLOCK 20/35/25
BG // TLBL TAPEOUT,'AR DESC 3',,,,,,1
BG // EXEC MSTROUT
BG CADT020D MOUNT VOLUME 100723 FOR FILE NO. 3 DSN='AR DESC 3' SYS011
BG CADT023I **** DSN 'AR DESC 3'FILE NO. 3 BEING CREATED ON TAPE
Chapter 2: Maintaining Tape Files 2–65