CA Dynam for VSE User Guide

Using CA Dynam/T
• The automatic scratch option (TAPEOPT=AUTOSCR) is specified for the
data set (any expired versions are automatically scratched when a new
version is closed and cataloged)
• The TAPEOPT=ROTATE option is specified for the data set (the oldest
version is used for output when a new version is created)
In order to explain how the various retention schemes work, we will refer to
the following sample DATA SET NAME LISTING. An asterisk beside the version
number indicates that the version is eligible for scratch.
1. Notice the multifile data sets AR.DESC.1, AR.DESC.2 and, AR.DESC.3.
Retention criteria for these data sets are simply two cycles (NGEN). Zero
days retention and no AS-OF-DATE retention are specified. Version three is
eligible for scratch, because three cycles exist.
2. Also note data set AR.MASTER, which has retention criteria of zero cycles,
30 days, and three AS-OF-DATE cycles (PEDCYC). The current AS-OF-
DATE for the data set is 12/31/**. Also, the AS-OF-DATE for each version
is 12/31/20, as indicated on each version line (PED). All the version AS-
OF-DATES are considered members of the same AS-OF-DATE cycle,
because all the version AS-OF-DATES are identical. Therefore, only the
most current will be retained because of AS-OF-DATE. Only data set
versions less than 30 days old will be retained, because 30 days retention
has been specified.
3. Finally, note data set AR.BACKUP, which has 2 cycles and 4 AS-OF-DATE
cycles retention. Versions 1 and 2 will always be retained because of the
2-cycle retention; (Version 1 would also be retained because of AS-OF-
DATE retention). Version 3 is a member of a different AS-OF-DATE group
(12/31/20), so it will be retained.
Chapter 2: Maintaining Tape Files 2–11