DSM/Tape Catalog User's Guide

DSM/TC Tape Processing

DSM/Tape Catalog User’s Guide — 520233-008

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Copying a Volume Set Created by the BACKUP

Utility

You can check the value of the logical copy using one of the following:



MEDIACOM command: info tapefile <tapefile name>,detail



SQLCI command from the volume where the tapefile is present: select * from

tapefile

For example, assume that system \A contains a file id Test1 with gen 1. If you perform

a parallel backup from system \B which directs one copy of backup to system \A using

the file id Test1, then the file id Test1 also appears on system \A along with the earlier

entries. However, on system \A, the second entry would have a logical copy value of 2.

BACKCOPY of a BACKUP Volume Set

This represents the results of a volume set created by a file-mode run of the standard

BACKUP utility:

Another copy of the volume set is needed and is obtained by running a BACKCOPY of

the preceding volume set. BACKCOPY is a standard Backup Restore utility. This

shows how the BACKCOPY volume set is identified:

DSM/TC automatically tracks multiple copies of volume sets created by the

BACKCOPY utility as belonging to the same generation and version, but DSM/TC

enters a number in the physical copy portion of a tape file or disk file entry in the

DSM/TC database to uniquely identify each set. As in the previous two examples, the

first volume set created by the BACKUP run is considered physical copy 1. As more

copies are cataloged for the same volume set, the physical copy designation is

incremented with the next higher number.

Physical copies contain the same tape file of the same generation and version, but the

volume sets might not be identical with regard to the number of reels used or the

amount of data written per reel. Therefore, one volume set can be substituted for

another as an entire set, but individual reels cannot be swapped between sets.

The standard BACKCOPY utility cannot be used to copy data backed up using the

Backup Restore 2.0 BACKUP command.

Examples



These two DEFINEs describe the output scratch tapes for a parallel backup run

that produces two identical volume sets for the tape file PAYROLL_BACKUP:

3> ADD DEFINE =OUT1, CLASS TAPECATALOG,&

3> & USE OUT,&

3> & LABELS BACKUP,&

Generation Physical Logical

Volume Set 1 1 1

Generation Physical Logical

BACKCOPY of Volume Set 1 2