entry-sequenced file can remain in the same partition, then the file is converted; otherwise, it
is skipped.
•
To convert a DP1 disk file in which the records of a relative or entry-sequenced file are split
into different partitions:
1.
Back up the entire partitioned file using the DP2FORMAT option and omitting the
PARTONLY option.
2.
Restore the file to a DP1FORMAT disk.
3.
Back up the file again by using DP2FORMAT and omitting PARTONLY.
•
If BACKUP returns file-system error 45 (file is full) for a key-sequenced file, back up that file in
a separate BACKUP procedure and specify larger extent sizes for the file with the EXT option.
Error 45 can appear for a key-sequenced file when the specified slack values significantly
increase the size of the converted file.
Backing Up With Labeled Tapes
You can perform labeled-tape backup and restore procedures using either file mode or volume
mode. BACKUP, RESTORE, and BACKCOPY send a labeled-tape request through a CLASS TAPE
DEFINE to the labeled-tape server process ($ZSVR). The $ZSVR labeled-tape server process passes
messages about labeled-tape operations to the operator console ($0) and the MEDIACOM console
(if one exists).
For more information, see
Backing Up or Converting DP1 and DP2 Files (page 76)
. For a description
of MEDIACOM, see the DSM/Tape Catalog Operator Interface (MEDIACOM) Manual.
Three types of labeled tapes can be used with BACKUP, BACKCOPY, and RESTORE: ANSI, IBM,
and BACKUP.
•
BACKUP can write to scratch ANSI, scratch IBM, and BACKUP labeled tapes.
•
RESTORE can accept only IBM and BACKUP labeled tapes.
Because RESTORE can only read data, it is unable to use scratch tapes. The volume label on
an IBM labeled tape conforms to IBM standards. The BACKUP data is accessible only on the
NonStop operating system. After the data on the tape expires, the tape can be reused on a
NonStop system or IBM system.
Do not use labeled backup tapes as a medium of exchange between NonStop systems and other
types of systems. NonStop operating system backup tapes contain physical image copies of Enscribe
files and unstructured files in a proprietary archive tape format. If you need to exchange data
between a NonStop system and another type of operating system, use blocked records on standard
labeled tapes (for example, ANSI or IBM labeled tapes) that can be read and written by FUP or
other programs.
Only BACKUP and RESTORE can access NonStop operating system labeled backup tapes.
BACKUP Guidelines and Examples
77