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

Setting Up Labeled-Tape Operations Using SCF

If you plan to use labeled-tape operations, use the ALTER SUBSYS command 
to set this option:

•

To turn on labeled-tape processing, enter at a TACL prompt:

-> SCF

-> STOP TAPE $* (Stops all tape operation)

-> ALTER $ZZSTO, LABELTAPE ON

-> START TAPE $*

-> EXIT

-> ZSERVER /NAME $ZSVR, NOWAIT, CPU primary-cpu / backup-cpu

•

To turn off labeled-tape processing, at a TACL prompt:

-> STOP $ZSVR (Stops the tape server process $ZSVR)

-> SCF (Starts SCF)

-> STOP TAPE $* (Stops all tape operation)

-> ALTER $ZZSTO, LABELTAPE OFF

-> START TAPE $*

For complete details about the ALTER SUBSYS command, including command 
syntax, see the SCF Reference Manual for the Storage Subsystem.

Data compression is a standard feature on the 9840 and 5259 tape drives. The 
tape drives write uncompressed data (unless compression mode is turned on).   
When activated for the tape drives, compression allows the drives to store up to 
three times as much data on a cartridge tape. However, the amount of 
compression varies with the data being written. Typically cartridge capacities 
can be expected to triple with the 9840 and 5259 tape drives.

Note. The system does not detect any difference in writing or reading compressed or 
uncompressed data. A disk file of 200 kilobytes written to tape in compressed mode is still a 
200-kilobyte file on the tape, but it consumes less tape than the same file with uncompressed 
data.