Memorex LOCK - VERSION 2-24 Información técnica Pagina 468

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Offload System
13-16 User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
Offload and Onload
Offload System
Description BIM-EPIC provides offload/onload, backup/restore, offload version
consolidation, and offload version copy functions for controlled
sequential disk dataset versions. These functions are only available on
BIM-EPIC systems supporting both disk and tape management. Control
statements identify the datasets processed by the offload, backup, version
consolidation, and version copy functions. The control statements are
created either manually or by the offload system itself.
The offload/onload function processes only controlled sequential disk
dataset versions identified in the BIM-EPIC Catalog. The offload
function copies a dataset version to tape and then deletes the disk VTOC
entry and changes the catalog entry for the version to show that it is
identified as residing on tape. The onload function copies the dataset
version residing on tape back to disk and changes the catalog entry for the
version to show that it is on disk. Performing an onload of a version
already identified as residing on disk will produce the same results as
RESTORE and should not be done.
BACKUP and RESTORE functions process controlled sequential disk
dataset versions identified in the BIM-EPIC Catalog as well as controlled
Start Track 1 sequential disk datasets.
BACKUP copies a dataset version to tape leaving the disk
version in place.
RESTORE copies a dataset to disk creating a new version for
generation files or replacing the current version for work files.
When copying a dataset to disk, the dataset characteristics currently in
effect will be recognized. Some changes may occur because of changes in
DASD architecture and geometry, for example, CKD to FBA, 3380 to
3390, etc. If specified in the BIM-EPIC pool definition, disk leveling is
done when writing multiple datasets as well as multiple extents for a
single dataset.
The Offload Version Consolidation function consolidates one or more
offload versions into a new version. This function can be useful for
offload versions that have most of their datasets in scratch status. For
example, an offload dataset may have version 5 consisting of four tapes
with 80% of the files on the tape in scratch status and version 7 consisting
of three tapes with 70% of the files in scratch status. These two versions
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