MAGTAPE/VOLID -- Automatic volume id generation for labeled tapes 82/03/26
The RWMT (READ_WRITE_MAGTAPE) and WBAK (WRITE_BACKUP) commands provide three
ways to generate the volume id for labeled tapes:
1. The id may be supplied explicitly with the -VID option.
2. It may be generated automatically, as described below.
3. If no id is supplied, and if automatic volume id generation has not
been enabled, then the default volume id of spaces is used.
To enable automatic volume id generation, create a directory called /SYS/TAPE.
In /SYS/TAPE, use the DM editing capabilities to create a file called
NEXT_VOLUME_ID. Place a 1-6 character alphanumeric text string in this file.
This is the string which will be used as the volume id the next time a tape is
to be labeled. When a labeling operation occurs, the string is automatically
updated by adding 1 to the right-most non-space character of the string, and
carrying to the left if the character was "9" or "Z".