Memorex LOCK - VERSION 2-24 Informations techniques Page 284

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Multi-Dataset Processing
7-16 User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
Explicitly (using JCL)
If the datasets are associated using TLBL statements, the length of the
prime dataset name is limited to 17 characters. However, the subdataset
names can be a maximum of 44 characters. This type of association is
made by specifying the prime dataset name when the subdataset names
are defined to the catalog.
If the datasets are associated using DD statements, the length of the prime
dataset name can be up to 44 characters. This type of association is made
by having the subdataset reference the prime dataset name on the DD
statement. Therefore, the DD statement for the prime dataset name is also
required to be in the same JCL stream as the subdataset that is being
created. This method allows the additional flexibility of associating the
same subdatasets with different prime datasets, depending on job
requirements.
Subdatasets 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
Scratching
Multi-Dataset
Tapes
Multi-dataset tape volumes are scratched when all active datasets on the
volume 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 have been scratched.
DSN Catalog If you want to write a group to a particular tape pool with a particular
density or you want to specify any other physical property or handling of
the tape, you must specify the parameters in the prime definition.
Applicable parameters on the TSIDMNT CATALOG or Online Manager
statement include:
Density (MOD)
Label type (LBL)
Owner ID (OWN)
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