Memorex LOCK - VERSION 2-24 Especificaciones descargar pdf (Pagina 399)

Offload System Introduction

Chapter 13. Disk Space Management 13-15

Offload System

Introduction

BIM-EPIC provides offload/onload, backup/restore, offload version consolidation, and

offload version copy functions for controlled sequential disk datasets versions; and is only

available on BIM-EPIC systems supporting both disk and tape management. The dataset

population to be processed by the offload, backup, version consolidation, and version copy

functions are identified by control statements created either manually or by the offload system

itself.

The offload/onload function only processes 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 leaving the version identified as residing on tape only. The

onload function copies a dataset version identified as residing on tape only back to disk

identifying the version as residing on disk only. Onloading a version already identified as

residing on disk only will function the same as the restore function.

The backup/restore function processes controlled sequential disk dataset versions identified in

the BIM-EPIC catalog as well as controlled start-track-1 sequential disk datasets. The backup

function copies a dataset version to tape leaving the disk version in place. The restore

function 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 reflecting

changes in DASD architecture and geometry (i.e., CKD to FBA, 3380 to 3390, etc.) will be

honored. Disk leveling is also honored 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 can be useful for offload versions that have most of their datasets in scratch

status. As an example: An Offload Dataset has Ver 5 with 4 tapes (80% of its files in scratch

status) and Ver 7 with 3 tapes (70% in scratch status). These two versions could be

consolidated into a new version of perhaps 1 or 2 tapes, - freeing 5 tapes for other uses.

The Offload Version Copy function copies an offload version into BIM-EPIC backup format.

It will copy an existing backup version or an existing offload version.

Description

1 2 ... 394 395 396 397 398 399 400 401 402 403 404 ... 488 489

Sin comentarios

Memorex LOCK - VERSION 2-24 Especificaciones Pagina 399