Technical data

Using BACKUP
11.12 Understanding BACKUP Tape Label Processing
• Compares the volume label specified in the BACKUP command line (either
explicitly with the /LABEL qualifier or implicitly through the save-set name)
to the volume label of the tape to prevent you from creating a save set on
the wrong magnetic tape. BACKUP uses the following guidelines when
processing tape labels:
If you specify a label that is longer than six characters, BACKUP
truncates the label to six characters.
If the volume label is less than six characters long, BACKUP pads the
volume label with the blank character to six characters.
The first four characters of the volume label either must match the first
four characters of the label specified in the BACKUP command line
exactly, or must end with one or more underscore characters. If the first
four characters of the volume label end with one or more underscore
characters, and the label specified in the command line matches the
part of the volume label that appears before the underscore characters,
BACKUP accepts the match. (For example, the volume label ABN_
matches the command line label ABN but does not match the command
line label ABNE.)
If the fifth and sixth characters of the volume label are numbers
between 0 and 9, BACKUP does not compare these characters with
corresponding characters in the label specified in the BACKUP command
line. Otherwise, the fifth and sixth characters in the volume label must
exactly match the corresponding characters in the label specified in the
BACKUP command line.
If the labels match, you have the proper protection, and the tape is expired,
BACKUP performs the designated operation.
If you specify more than one label with the /LABEL qualifier and you do not
specify the /EXACT_ORDER qualifier, the BACKUP operation succeeds if any of
the labels you specify match the tape’s volume label. For example, if the tape’s
volume label is MA1686, the BACKUP operation will succeed if you specify the
following list of labels with the /LABEL qualifier:
/LABEL=(MA1684,MA1685,MA1686)
If the volume labels do not match, BACKUP displays the following error message:
%MOUNT-I-MOUNTED, DKA0 mounted on _SODAK$MUA0:
%BACKUP-W-MOUNTERR, volume 1 on _SODAK$MUA0 was not mounted because
its label does not match the one requested
%BACKUP-W-EXLABEER, volume label processing failed because
volume MB1684 is out of order, Volume label MA1684 was expected
specify option (QUIT, NEW tape, OVERWRITE tape, USE loaded tape)
BACKUP>
Depending on the option you specify, you can quit the backup operation (QUIT),
dismount the old tape and mount a new one (NEW), overwrite the data on the
tape (OVERWRITE), or USE the loaded tape.
If you specify more than one label with the /LABEL qualifier and you also specify
the /EXACT_ORDER qualifier, BACKUP compares the label of the loaded tape
with the first label that you specified with the /LABEL qualifier. If the labels
match, BACKUP begins the operation. If the labels do not match, BACKUP
prompts you with the previous message.
Using BACKUP 11–23