HP (Hewlett-Packard) L700 (CTL700) ユーザーズマニュアル

Managing Tape Drives

L700 (CTL700) Installation and User’s Guide — 527338-004

Using SETMODE 162 to Control Compression Mode

This example for an unlabeled tape shows a BACKUP command that does not 
use a DEFINE. In this case, the tape drive writes data using the systemwide 
default compression specification. 

->BACKUP $TAPE, $DATA.*.*

This example for a labeled tape shows a File Utility Program (FUP) command 
that uses a CLASS TAPECATALOG DEFINE NAMED =FUPOUT to turn 
compression on (IDRC). The USE OUT attribute specifies to write the file to 
tape.

The FUP COPY command copies the contents of FILE1 record-by-record to 
volume IBM001.

->ADD DEFINE =FUPOUT, CLASS TAPECATALOG, LABELS IBM, &   

 VOLUME IBM001, COMPRESSION IDRC, USE OUT, CATALOG OFF

->FUP COPY FILE1, =FUPOUT

For more information about how to create DEFINES and use them in labeled 
tape processing, see the Guardian User's Guide and the Guardian Disk and 
Tape Utilities Reference Manual. For information on how to specify CLASS 
TAPECATALOG DEFINES, see the DSM/Tape Catalog User's Guide.  For more 
information on using the BACKUP and FUP utilities, see the Guardian Disk and 
Tape Utilities Reference Manual and the File Utility Program (FUP) Reference 
Manual.

If you do not want the systemwide default compression specification (default is 
normally compression off), you can use the SETMODE 162 procedure call to set 
compression mode on or off. 

Considerations:

•

Changes to compression using SETMODE 162 are allowed only at the 
beginning of tape (BOT). Otherwise, the tape drive returns an error.

•

BACKUP and FUP utilities do not support SETMODE operation.

No data compression

1

Data compression

2