DSM/Tape Catalog User's Guide

Introduction to DSM/TC
DSM/Tape Catalog User’s Guide — 520233-008
1 - 14
CATALOGFILES Option of BACKUP and
BACKCOPY
CATALOGFILES Option of BACKUP and BACKCOPY
Backing up data is an essential task at most installations. Because BACKUP is often
run on a regular schedule for the same tape file name, there will be more than one
generation of a backup volume set.
Given that a backup volume set can comprise several tapes with hundreds of copied
disk files associated with its tape file name, it is difficult to track which disk file was
copied to which tape in the volume set when you want to recover a disk file. This is
further complicated when you must search through several generations of the same
tape file name of a backup tape.
Recovering a disk file is considerably easier when the backup data is cataloged at the
time it is created. To catalog, combine the BACKUP option CATALOGFILES with a
TAPECATALOG DEFINE.
You can catalog only the tape file name of the backup volume set, or the tape file name
and each disk file copied.
Volume-Mode Backup
HP recommends cataloging only the tape file name when you run the BACKUP utility
in volume mode. You can catalog the copied disk files too, but DSM/TC does not track
which tape a disk file entry belongs to for a volume-mode backup. You would clutter
the file catalog with disk file entries of minimal value. BACKUP ignores the
CATALOGFILES option for volume-mode backups.
This example shows a volume-mode run of BACKUP in which the disk files are not
cat
aloged when they are copied from the volume $OPS:
3> ADD DEFINE =VOLUME_OUTPUT, CLASS TAPECATALOG,&
3> & USE OUT,&
3> & LABELS BACKUP,&
3> & POOL OPERATIONS_TAPES,&
3> & VOLUME SCRATCH,&
3> & FILEID DAILY_DOUBLE
4> BACKUP =VOLUME_OUTPUT, VOLUMEMODE, $OPS, BLOCKSIZE 28
At the conclusion of the job, the file cat
alog has one tape file entry for
DAILY_DOUBLE. There are no disk file entries for DAILY_DOUBLE.
For more information on the BACKUP (T9074) utility and volume-mode backup
procedures, see the Guardian Disk and Tape Utilities Reference Manual.
Note. Unless otherwise stated, this manual discusses a TAPECATALOG DEFINE with the
assumption that the DEFINE is being used to access DSM/TC. To access DSM/TC, the
DEFINE specifies the CATALOG attribute as ON or does not use the CATALOG attribute, in
which case CATALOG defaults to ON.