
Rules for Dataset Retention Version Information
1-22 User Reference
Rules for Dataset Retention
BIM-EPIC’s retention rules for cataloged datasets are:
Tapes are not made available for reuse and disk space is not released until dataset versions are
scratched.
Non-temporary versions are not scratched until the SCRATCH function of the TSIDUTL
utility is executed. TSIDUTL does not scratch any versions until they are eligible. A version
is not eligible until ALL the retention criteria have been satisfied.
Any version can be scratched at any time using the SCRATCH function of Online Manager or
the TSIDMNT utility.
A previous work dataset version is scratched immediately when a new version is opened. A
previous tape work dataset version becomes eligible for scratch when a new version is opened.
Work dataset versions can be scratched at close (on input) or at end of job or job step using
JCL options. Disk space is freed and tapes become available for reuse immediately.
Multi-dataset tape volumes are not made available for reuse until all dataset versions on the
tape have been scratched.
Conditionally cataloged versions become eligible for scratch the day after their creation.
Common work dataset versions are always scratched at end of job.
Open versions become eligible for scratch according to the THLDOPEN and DHLDOPEN
parameters of the TSIDUTL utility’s SCRATCH function. The default is to retain open tape
versions for one day and open disk versions for two days after their creation dates.
Tapes in open status can be reused before they are actually scratched. They are accepted as
scratch tapes if they are accessed in the same partition with a different job name. While this
means that the tape is vulnerable to accidental reuse, it also means that these tapes are
immediately available as scratch. Please ensure that your operators are informed of this. Use
of tapes in open status can be modified by BIM-EPIC special options.
Cataloged Datasets
WARNING!
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