Memorex LOCK - VERSION 2-24 Technical Information Seite 116

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Understanding Retention Concepts
2-52 User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
Retaining and Scratching Datasets
Understanding Retention Concepts
Description Retention is the amount of time a dataset is kept before the dataset is
scratched. Retention is one of the most critical areas of information
control. Scratching or making a tape available for reuse, occurs when a
dataset version’s retention criteria have been met. Retention criteria for
automated tape management systems must be monitored and controlled
by users in order to protect their information.
Implementing
Retention
BIM-EPIC maintains a variety of retention criteria. A version is scratched
only when all criteria are met.
BIM-EPIC commands DELETE and SCRATCH are used for scratching
versions. Single-file tape volumes associated with scratched dataset
versions become valid scratch tapes immediately after using either of
these commands. Multi-file tape volumes become valid scratch tapes
when all associated datasets are scratched. Scratched disk versions are
immediately removed from the VTOC.
DELETE removes a dataset definition and all associated versions from
the DSN Catalog and from BIM-EPIC control. All tape volumes
associated with the dataset definition become scratch tapes according to
the rules for single-file and multi-file tape volumes and are listed in the
DSN Catalog under the dataset name ** DSN DELETED **. See
Managing Dataset Definitions” for additional information. All disk
versions are removed from the VTOC.
SCRATCH scratches one or more versions of a specific dataset. You can
use associated tape volumes immediately as output tapes. BIM-EPIC
resequences version numbers as you scratch each version. For example, if
you scratch version number 1, version 2 now becomes version 1, version
3 now becomes version 2, and so on.
Initiating the
Scratch
Process
You must run a scratch process before BIM-EPIC expires a dataset or
allows a tape to be reused. Scratch processes can be performed manually
using either Online Manager or TSIDMNT.
TSIDUTL SCRATCH searches the entire DSN Catalog for all dataset
versions which have satisfied their retention criteria and scratches them.
You can limit the scratch process to tape only, disk only, or to certain user
IDs or system IDs.
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