DFSMShs Term

CA Disk Term

Description

Aggregate backup

Backup, including XCOPY

Copy data and control information from a user-defined group of data sets.

Alternate tape volume

Duplicate copy tape

Copy of original tape volume, created simultaneously or subsequent copy process.

Auto-recall

Auto-Restore (DMSAR)

Recall initiated automatically, transparent to the requesting task.

Backup

Backup

Copy a data set residing on a primary disk to a backup volume.

Backup control data set (BCDS)

Files data set (DSNINDEX)

Control file containing information about data set backup versions.

Expiration

IXMAINT

The removal of a user data set from a primary volume or the deletion of a migrated data set version.

Full Volume Dump

VBACKUP

Process using DFSMSdss that backs up the allocated space on a disk volume.

Level 0

Primary disk (DASD)

Online disk volume containing data directly accessible by the user.

Level 1

Disk archive

Disk volume under DFSMShsm control containing data sets migrated from Level 0.

Level 2

Tape

Volume (usually tape) under DFSMShsm control containing data sets migrated from Level 0 or level 1.

Migrate

Archive

Move a cataloged data set from primary disk to ML1 or ML2.

Migration control data set (MCDS)

Files data set (DSNINDEX)

Control file containing information about data sets that scratched after backup.

Offline control data set (OCDS)

Files data set (ARCHVOL)

Control file containing information about migration and backup tapes and about each data set on these tapes.

Recall

Restore

Moving a migrated data set back to Level 0 from Level 1 or 2.

Recover

Restore/Recover

Recovering a single or multiple data sets to level 0 from backup volumes.

Recycle

Merge

Copies all valid data on a tape to a tape spill backup or ML2 volume.