CA Dynam for VSE User Guide

Tape File Management Utilities
Normally, all ASSGNs can be made to the same dummy device by using UPSI
01. However, when performing the CA SORT MERGE function, you must use
different dummy devices to satisfy all of the checks of the MERGE function.
Note: Specifying S:nnn on the TLBL causes an assignment to a dummy device
at JCL time. This method would avoid the need, in some cases, of executing
TDYNASN.
Format Two
The second format of the ASSGN statement assigns the first SYS number to
the same device as the second SYS number.
// ASSGN SYS004,SYS005
Example:
This JCL assigns SYS004 to the same device as SYS005.
// EXEC TDYNASN
// ASSGN SYS004,SYS005
/*
Issuing the ASSGN Command
This command locates the proper tape and makes the logical unit assignment:
ASSGN filename,SYSxxx{,INPUT|OUTPUT}[,S|U]
You must include a TLBL for the file name before executing TDYNASN.
INPUT
OUTPUT
S
U
locates the data set specified in the TLBL statement and makes the logical unit
assignment to that drive.
locates a scratch tape and makes the assignment to that drive.
creates a DTF with standard labels for input or output. S is the default.
creates an unlabeled DTF for input or output.
Example:
// TLBL SORTOUT,'DSN'
// TLBL SORTIN1,'DSN'
// EXEC TDYNASN
ASSGN SORTOUT,SYS001,OUTPUT
ASSGN SORTIN1,SYS002,INPUT
/*
Chapter 3: Supporting Tape File Management 3–3