Memorex LOCK - VERSION 2-24 Especificações Página 235

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Processing Tape Datasets Multi-Dataset Processing
Chapter 7. Running Jobs With BIM-EPIC 7-15
Each subdataset has its own EDD, but some subdataset attributes cannot be specified because
they are always inherited from the prime dataset. These attributes are:
Density
Tape labeling
Tape size
Tape pool
Owner ID
Vaulting method
Multi-dataset tapes are scratched when all active datasets on the tape are scratched. None of
the volumes in a multi-dataset/multi-volume group is eligible for scratch until all active
datasets on all active volumes are scratched.
1. If you want the group to be written to a particular tape pool, or with a particular density, or
you want to specify any other physical property or handling of the tape, these characteristics
must be specified in the prime definition. Applicable parameters on the TSIDMNT
CATALOG statement include:
density (MOD)
label type (LBL)
owner ID (OWN)
tape size (SIZ)
vaulting method (VLT)
tape pool (TPL)
2. Several important limitations apply when creating a subdataset EDD.
You must catalog the subdatasets using Online Manager (or TSIDMNT), or autocatalog them
using DD statements. You cannot use TLBL statements to autocatalog subdatasets.
You must enter the prime dataset name correctly the first time for a subdataset EDD, because
you cannot change the prime dataset name field in an existing subdataset EDD.
You can supply independent retention criteria, passwords, and block sizes for each subdataset.
You may find it helpful to give all the datasets in each multi-dataset group a single, unique
user ID or system ID. This makes it easier to report or scratch them as a group, rather than as
individual datasets.
1. Inhibit LUB allocation for all datasets using either of the following:
option "64" in a TLBL statement
SYSnnn option in a DD statement
Subdatasets
Scratching Multi-
Dataset Tapes
DSN Catalog
JCL Requirements
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