CA Dynam for VSE User Guide

Using Other Software with CA Dynam/T
CA Dynam/T offers various methods of dealing with LIBR's nonstandard tape
structure. It provides support for LIBR's BACKUP, RESTORE, or both, using the
following files:
• CA Dynam/T-controlled files, with either
−
−
The NOLABEL option, or
Forced label tape support
• Non-CA Dynam/T-controlled files
Using CA Dynam/T-controlled Files
With the NOLABEL
Option
CA Dynam/T supports most variations of LIBR backup tapes through use of
the NOLABEL option in conjunction with TDYNASN job control statements.
Multifile data sets under CA Dynam/T's control, however, are not supported.
We recommend that before creating CA Dynam/T-controlled data sets used for
LIBR backups, you include TAPEOPT=NOLABEL in their catalog definitions. This
lets you use TDYNASN, as shown in the JCL examples, to perform the
following:
• Multiple (sub)library backup/restores to CA Dynam/T-controlled data sets
• RESTORE=STANDALONE backups to CA Dynam/T-controlled data sets
The example job control shows that TDYNASN JCL statements have the
following properties:
• Include a TDYNASN preopen DUMMY assignment
• Use the OPEN file name SYSxxx,mode,U TDYNASN function. It is necessary
because standalone phases (if specified) will be written to tape by LIBR
before any OPEN, or preopen, logical unit assignment checking is done.
• Specify option U on the OPEN statement to identify the unlabeled DTF to
TDYNASN
Be sure to reinitialize the tape volume the next time it is used for output when
using TAPEOPT=NOLABEL; the VOL1 label has been overwritten by LIBR.
Exceptions
The information provided so far applies to both online and standalone LIBR
backups, with the following exceptions:
When specifying RESTORE=STANDALONE with a CA Dynam/T-controlled tape,
you must use the TDYNASN OPEN function, as the VOL1 label is overwritten
with the standalone phases prior to open by LIBR. The TDYNASN ASSGN
function only allows for preopen ASSGN checking, not actual I/O. This means
that you must use a different DTFNAME for TDYNASN than you do for LIBR,
thereby preventing a double OPEN and any ensuing problems.
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