Cables and speeds, Sharing on a storage area network, Cables – Dell TL2000 User Manual
Page 49: Speeds, Using, Zoning, Isolate, Devices, Enhance, Security
v
LN
Port:
(default
setting)
-
an
automatic
configuration
that
tries
arbitrated
loop
first,
then
switched
fabric
v
L
Port
-
arbitrated
loop
v
N
Port
-
point
to
point
protocol
in
a
switched
fabric
topology
Cables
and
Speeds
Ultrium
3
and
Ultrium
4
Fibre
Channel
tape
drives
use
LC
duplex
fiber
optics
cables.
The
maximum
distances
that
the
library
supports
on
a
Fibre
Channel
link
is
determined
by
the
link
speed,
the
type
of
fiber
(50-micron
or
62.5-micron),
and
the
device
to
which
the
library
is
attached.
If
the
library
attaches
to
an
HBA
(Host
Bus
Adapter),
refer
to
the
distances
that
are
supported
by
the
HBA.
If
the
library
attaches
to
a
switch,
the
supported
distances
are:
v
For
a
50-micron
cable:
–
1-Gbit
link
speed
=
up
to
500
m
(1640
ft)
–
2-Gbit
link
speed
=
up
to
300
m
(984
ft)
–
4-Gbit
link
speed
=
up
to
150
m
(492
ft)
v
For
a
62.5-micron
cable:
–
1-Gbit
link
speed
=
up
to
175
m
(574
ft)
–
2-Gbit
link
speed
=
up
to
150
m
(492
ft)
–
4-Gbit
link
speed
=
up
to
70
m
(230
ft)
The
library
uses
50-micron
cables
internally.
Therefore,
you
must
use
a
50-micron
cable
to
attach
to
the
library’s
port.
To
attach
to
a
62.5-micron
SAN,
you
must
attach
the
50-micron
cable
to
an
active
port,
such
as
a
port
on
a
switch.
Using
Zoning
to
Isolate
Devices
and
Enhance
Security
For
security
reasons,
it
is
important
to
limit
the
devices
that
a
server
or
servers
can
recognize
or
access.
Also,
some
performance
configurations
and
SAN
configurations
can
result
in
a
device
being
seen
multiple
times
from
the
same
server.
For
example,
if
you
have
two
HBAs
from
the
same
server
connected
to
an
Ultrium
Tape
Drive
in
the
library,
the
drive
will
be
detected
and
appear
as
two
logical
devices.
That
is,
there
will
be
two
special
files
for
one
physical
device.
Zoning
can
address
these
issues.
Zoning
allows
you
to
partition
your
SAN
into
logical
groupings
of
devices
so
that
each
group
is
isolated
from
the
other
and
can
only
access
the
devices
in
its
own
group.
Two
types
of
zoning
exist:
hardware
zoning
and
software
zoning.
Hardware
zoning
is
based
on
physical
fabric
port
number.
Software
zoning
is
defined
with
a
World
Wide
Node
Name
(WWNN)
or
World
Wide
Port
Name
(WWPN).
While
zoning
can
be
reconfigured
without
causing
an
outage,
some
zoning
configurations
can
become
complicated.
The
advantage
of
the
library’s
WWNN
implementation
is
that
you
can
avoid
the
exposure
of
introducing
zoning
errors
because
you
do
not
have
to
change
the
zoning
configuration
if
a
drive
needs
service
or
replacement.
Sharing
on
a
Storage
Area
Network
With
Storage
Area
Network
(SAN)
components,
the
possibilities
for
connecting
multiple
systems
and
multiple
drives
have
increased.
Not
all
software
and
systems
are
designed
to
share
drives.
Before
you
install
a
drive
that
would
allow
two
systems
to
share
it,
check
that
the
systems
and
their
software
support
sharing.
If
your
software
does
not
support
sharing,
note
that
Fibre
Channel
switches
have
a
Chapter
3.
Installation
Planning
3-9