By
using
the
built-in
data-compression
capability
of
the
tape
drive,
greater
data
rates
than
the
native
data
transfer
rate
can
be
achieved.
However,
the
actual
throughput
is
a
function
of
many
components,
such
as
the
host
system
processor,
disk
data
rate,
block
size,
data
compression
ratio,
SAS
bus
capabilities,
and
system
or
application
software.
Cartridge
compatibility
The
TS2240
uses
the
IBM
TotalStorage
®
LTO
Ultrium
800
GB
Data
Cartridge
and
is
compatible
with
the
cartridges
of
its
predecessor,
the
IBM
TS2340
Tape
Drive.
The
drive
performs
the
following
functions:
v
Reads
and
writes
Generation
4
cartridges
to
Generation
4
format
v
Reads
and
writes
Generation
3
cartridges
to
Generation
3
format
v
Reads
Generation
2
cartridges
v
Does
not
write
Generation
4
cartridge
to
Generation
3
format
v
Does
not
write
Generation
3
cartridges
to
Generation
2
format
v
Does
not
write
Generation
2
cartridges
v
Does
not
read
or
write
Generation
1
cartridges
The
drive
reads
tapes
that
have
been
written
by
other
licensed
Ultrium
4
drives.
It
also
writes
to
tapes
that
can
be
read
by
other
licensed
Ultrium
4
drives.
In
addition
to
using
the
IBM
TotalStorage
LTO
Ultrium
Data
Cartridge
with
up
to
800
GB
capacity,
the
drive
also
offers
read/write
capability
for
certified
LTO
Ultrium
tape
cartridges.
Speed
Matching
To
improve
system
performance,
the
drive
uses
a
technique
called
speed
matching
to
dynamically
adjust
its
native
(uncompressed)
data
rate
to
the
slower
data
rate
of
a
server.
With
speed
matching,
the
drive
operates
at
different
speeds
when
reading
or
writing
the
Ultrium
3
or
Ultrium
4
cartridge
format.
Native
data
rates
are
as
follows:
v
Ultrium
4
(Read/Write):
31,
40,
52,
67,
85,
105
and
120
MB/s
v
Ultrium
3
(Read/Write):
30,
40,
50,
60,
70,
or
80
MB/s
v
Ultrium
2
(Read
only):
15,
19,
22,
26,
or
30
MB/s
If
the
server’s
net
(compressed)
data
rate
is
between
two
of
the
preceding
native
data
rates,
the
drive
calculates
the
appropriate
data
rate
at
which
to
operate.
Speed
matching
dramatically
reduces
backhitch,
the
condition
that
occurs
when
a
tape
stops,
reverses,
and
restarts
motion.
A
backhitch
is
usually
the
result
of
a
mismatch
between
the
data
rates
of
the
server
and
the
drive.
Channel
Calibration
System
performance
is
further
optimized
by
a
feature
called
channel
calibration
,
in
which
the
drive
automatically
customizes
each
read/write
data
channel
to
compensate
for
variations
in
such
things
as
the
recording
channel’s
transfer
function,
the
media,
and
characteristics
of
the
drive
head.
Chapter
1.
Product
description
1-3
Содержание System Storage TS2240
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