IBM RS/6000 7025 manual Environments, Tape Cartridge Data Efficiency, Operating, Mm Data

Operating in		Harsh	Environments
The 8-mm tape drive is ideally suited				to streaming operations, as opposed to tap
movement operations involving multiple stop/starts					and random searches. When the
tape	is used for frequent stop and			start	operations, streaming movement	is	benef
and	should be used whenever possible.			This	can be accomplished by ensuring that
any	save	or	restore operation is the	only	active operation performed	by	a devi

connected	to this	SCSI I/O controller.
Any tape that has been used outside the				ranges	specified in the table on 2-2
extended	period	of time (50 passes in	40	hours of nonstop operation) should not
used as	an archival tape. Exposure to		the	environment will deteriorate the magnet
and physical strength of the tape. Do			not	store important data on a tape that
been used outside the specified ranges;				transfer	the data to a new tape for
archiving.

8-mm Data

Cartridge

Erasure

Most

bulk

eraser

devices

do

not

have the

capability

to

erase 8-mm data cartridg

To properly erase an 8-mm

data cartridge

with a

bulk

eraser

device,

the erasur

rating must be

at

least

1500

oersted.

The 2.3GB and the 5.0GB

8-mm

tape

drives

erase

residual

data

before

writing new

data

on

the

data

tape.

Tape Cartridge Data Efficiency

The 8-mm tape cartridge efficiency is defined as the amount of data that can stored on the cartridge. The following variables affect the amount of data that stored on a tape cartridge:

Ÿ Size of the data file

Ÿ Number of file marks per file

Ÿ File mark size used

Ÿ Compatibility mode (2.3GB or 5.0GB)

ŸMedia rewrites.

Chapter 2. Using the System2-23Unit