For
maximum
performance,
multiple
SCSI
buses
may
be
required
(see
and
IBM
Ultrium
Tape
Drives
must
be
the
only
target
devices
that
are
active
on
the
bus.
Note:
For
maximum
performance,
the
quantity
of
tape
drives
that
you
can
attach
to
one
SCSI
bus
is
limited,
and
is
based
on
the
type
of
bus
that
you
have
and
the
amount
of
data
compression
achieved.
Ultra160
SCSI
buses
have
a
bandwidth
of
160
MB
per
second;
Ultra320
SCSI
buses
have
a
bandwidth
of
320
MB
per
second.
The
table
below
lists
the
types
of
SCSI
buses
and
gives
the
recommended
maximum
quantity
of
drives
that
you
can
attach.
Table
2-6.
Recommended
maximum
quantity
of
drives
per
SCSI
bus
Type
of
Drive
Type
of
SCSI
Bus
Ultra160
Ultra320
LVD
Ultrium
3
2
(1
drive
at
2:1
compression)
2
(1
drive
at
2:1
compression)
Using
Multiple
SCSI
Buses
The
library
has
two
SCSI
connectors
for
each
tape
drive
in
the
library.
Each
drive
can
be
daisy-chained
using
a
SCSI
bus
jumper
that
is
included
with
each
tape
drive.
Removal
of
any
jumpers
will
create
a
SCSI
bus
for
each
drive
installed
in
your
library
for
attachment
to
multiple
servers
or
to
multiple
SCSI
adapter
cards
on
one
server.
Multiple
SCSI
buses
may
be
required
for
maximum
performance,
depending
on
the
application
and
data
compression
ratio.
Note,
however,
that
library
(Medium
Changer)
control
is
required
on
at
least
one
SCSI
bus.
The
Medium
Changer
device
is
required
to
be
addressed
via
LUN
1
of
the
lowest-numbered
drive
position
of
each
logical
library.
The
Medium
Changer
device
may
additionally
be
addressed
via
LUN
1
of
other
drives
in
any
logical
library.
Any
bus
containing
a
Medium
Changer
device
via
LUN
1
of
a
drive
is
referred
to
as
a
control
and
data
path.
Any
other
bus
is
referred
to
as
a
data
path.
For
information
about
control
paths,
see
Terminating
the
Bus
The
SCSI
bus
and
all
of
the
wires
in
the
SCSI
cable
must
be
properly
terminated
according
to
the
SCSI
standard.
You
can
plug
an
external
terminator
into
one
of
the
SCSI
connectors.
A
terminator
must
be
installed
on
the
last
device
on
each
end
of
a
string
of
multiple
devices.
A
terminator
is
included
with
each
Ultrium
Tape
Drive.
SCSI
Connectors
and
Adapters
The
library
is
supported
by
a
wide
variety
of
servers
(hosts),
operating
systems,
and
adapters.
These
attachments
can
change
throughout
the
product’s
life
cycle.
To
determine
the
latest
supported
attachments,
visit
the
web
at
http://www.ibm.com/storage/lto
Or,
contact
your
IBM
Sales
Representative.
Fibre
Channel
Interface
Cables
and
Speeds
Ultrium
3
Fibre
Channel
tape
drives
use
LC
duplex
fiber
optics
cables.
Chapter
2.
Installation
Planning
2-9
Summary of Contents for System Storage TS3310
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