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Backing Up Migrated Data Sets

IP.com Disclosure Number: IPCOM000048870D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Beglin, TW: AUTHOR

Abstract

In a space management technique, migration of data sets can precede or be subsequent to a backing-up process, wherein "backing up" means making a duplicate copy of a data set residing in a primary storage volume in a backup storage volume. The primary storage volume can be a high performance DASD (direct-access storage device), while the backup storage volume can be a low-performance DASD, magnetic tape, or the like. A backup control data set (BCDS) and a migration control data set (MCDS) provide the control mechanism which enables a space management program to scan a relatively small set of entries in a data set for determining which migrated data sets need to be backed up.

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Backing Up Migrated Data Sets

In a space management technique, migration of data sets can precede or be subsequent to a backing-up process, wherein "backing up" means making a duplicate copy of a data set residing in a primary storage volume in a backup storage volume. The primary storage volume can be a high performance DASD (direct-access storage device), while the backup storage volume can be a low- performance DASD, magnetic tape, or the like. A backup control data set (BCDS) and a migration control data set (MCDS) provide the control mechanism which enables a space management program to scan a relatively small set of entries in a data set for determining which migrated data sets need to be backed up.

A plurality of hosts each contain identical copies of a space manager program. All copies of the space manager program cooperate to manage a common store consisting of a plurality of DASDs, magnetic tapes, random- access memories, and the like. The common store is divided into primary storage, backup storage and migration storage. Migration constitutes transfer of data sets from the primary to the migration store. Migrated data sets can be automatically recalled. Data sets can be migrated before being backed up. A separate queue for backup is generated in the BCDS each time a non backed up data set is migrated. This queue is scanned during backup processes for ensuring that migrated data sets, as well as primary data sets, are backed up.

Upon migration from prim...