CA Dynam for VSE User Guide

Using Cataloged Information
Limiting Tape Allocation
The tapes that can be allocated for a data set are limited by data set
ownership to a particular group of volumes, as follows:
• All active owned versions of a data set retain the ownership, even after
scratching. Ownership is specified on all data set reports. During AVR,
CA Dynam/T selects output scratch tapes with the same owner as the data
set for which they are required (if the data set has an established owner).
• If a scratch tape with the same owner is not available, the operator can
reinitialize another scratch tape to the requested owner.
Retaining Data Set Ownership
A volume's data set ownership code is not a physical part of the VOL1 or HDR1
of the tape. Thus, if a scratch volume is added to a data set which has a
certain owner code, the volume is immediately considered a member of that
owner group. You do not have to reinitialize the tape. When this volume is
scratched, it retains the ownership of the last data set of which it was a
member.
Verifying Tape Ownership
The Catalog owner ID enables CA Dynam/T to verify the ownership of tapes
during AVR. This prevents tapes received from other installations using
CA Dynam/T from being confused with your installation's tapes.
Most installations use numeric volume serial numbers; a tape received from
another CA Dynam/T user could easily contain a volume serial identical to one
in the Catalog as a scratch tape.
By placing a unique owner ID on the VOL1 label of tapes associated with a
particular Catalog, and specifying CATCHK(YES) in the DYNAM/T option record,
CA Dynam/T can be directed to require output scratch tapes to have an owner
ID matching that of the installation. If CATCHK(NO) is specified, the owner ID
will be placed in the VOL1, but no Catalog ownership checking will be
performed during AVR.
Use the DYNCAT INT, INTR, SCRPOOL, and ALTER volser commands to
establish an ownership code for a volume. These two-character ownership
attributes are maintained in the Catalog file.
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