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Understanding Retention Concepts Retention and Scratching

2-46 User Reference

Retention and Scratching

Understanding Retention Concepts

Retention is how long a dataset is kept before it can be discarded. Retention is one of the

most critical areas of information control. Scratching, or making a tape available for reuse, is

the physical storage consequence of the expiration of a tape dataset’s retention. All automated

tape management systems must ensure that retention is monitored and controlled in order to

protect information assets.

BIM-EPIC maintains a variety of retention criteria. Retention can expire only when all

criteria are met. This implementation protects your datasets against inadvertent scratching.

There are two BIM-EPIC functions for removing datasets: DELETE and SCRATCH. Single-

file tape volumes associated with scratched dataset versions become valid scratch tapes

immediately after using either of these functions. Multi–file tape volumes become valid

scratch tapes when all associated datasets are scratched.

Use the DELETE function to remove a dataset definition and all its 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 the section on

"Managing Dataset Definitions" for further information.

Use the SCRATCH function to scratch versions of a specific dataset. Associated tape

volumes can be used immediately as output tapes if all datasets on the affected tape have been

scratched. BIM-EPIC resequences version numbers as you scratch each version. So if you

scratch version number 1, what used to be 2 becomes 1, 3 becomes 2, and so on.

You must run a scratch before BIM-EPIC expires a dataset or allows a tape to be reused.

Scratches can be performed by manual catalog management, using either the Online Manager

or the TSIDMNT utility.

The TSIDUTL scratch process searches the entire DSN Catalog for all dataset versions which

have satisfied their retention criteria and expires them. However, you can limit the scratch to

certain user IDs or system IDs.

Introduction

How BIM-EPIC

Implements

Retention

The DELETE

Function

The SCRATCH

Function

Initiating the

Scratch Process

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Memorex LOCK - VERSION 2-24 Especificaciones Pagina 104