Operating System Device Drivers
9
SDLT Tape Drives Reference Guide
HP Tru64 UNIX
The HP Tru64 UNIX operating system uses Dynamic Device Recognition (DDR)
which allows the operating system to recognize the SDLT drive.
If the Tru64 UNIX system does not have a DDR entry to identify the SDLT drive,
the system defaults to a generic SCSI device and to the default settings of the tape
drive.
DDR Recognition
Note:
Starting with UNIX 5.1, the syntax for tape related commands changed. The
examples included below show the new syntax.
The SDLT drive provides compression so that the storage capability for tapes can
be effectively doubled when the tape drive has been instructed to turn on
compression. This is known as hardware compression. Hardware compression is
controlled by the drive firmware and should be used instead of the software
compression that is sometimes provided by software products. Check the software
application manual to understand the interaction of the application with regard to
hardware compression. The drive is instructed by the user to turn on hardware
compression through use of switches in utilities such as tar. (Additional
information is available online. See the man pages for tz, file, tar, dump and cpio.
Additionally the man page for ddr.dbase can be useful. It is the derivation for the
integers associated with compression below).
201412-003.book Page 9 Thursday, October 3, 2002 9:05 AM
Содержание StorageWorks SDLT 320
Страница 6: ...Contents vi SDLT Tape Drives Reference Guide 201412 003 book Page vi Thursday October 3 2002 9 05 AM ...
Страница 58: ...Specifications 46 SDLT Tape Drives Reference Guide 201412 003 book Page 46 Thursday October 3 2002 9 05 AM ...
Страница 70: ...Density Select 58 SDLT Tape Drives Reference Guide 201412 003 book Page 58 Thursday October 3 2002 9 05 AM ...
Страница 74: ...Index 62 SDLT Tape Drives Reference Guide 201412 003 book Page 62 Thursday October 3 2002 9 05 AM ...