Cabling
the
EXP100
The
EXP100
supports
two
redundant
drive
loops.
A
redundant
EXP100
drive
loop
consists
of
one
or
more
expansion
enclosures
that
are
connected
to
a
DS4000
storage
subsystem
using
two
sets
of
Fibre
Channel
cables.
If
one
Fibre
Channel
drive
loop
fails,
the
storage
subsystem
uses
the
other
drive
loop
to
maintain
input/output
(I/O)
to
the
EXP100
drives.
Usually,
there
are
two
redundant
array
of
independent
disks
(RAID)
controllers
in
a
DS4000
storage
subsystem.
Use
the
Fibre
Channel
Cabling
Instructions
that
ships
with
your
storage
subsystem
for
the
specific
information
about
cabling
the
EXP100.
Before
cabling
the
expansion
enclosure,
read
the
following
information:
v
Fibre
Channel
loop:
A
Fibre
Channel
loop
consists
of
EXP100
storage
expansion
enclosures
that
are
connected
to
each
other
and
to
one
or
more
RAID
controllers.
A
loop
can
support
multiple
RAID
controllers,
multiple
EXP100
expansion
enclosures,
and
other
addressable
entities
such
as
system-management
logic
chips.
Refer
to
your
storage
subsystem
documentation
for
information
about
controller-dependent
hardware
configuration.
Some
controllers
might
have
restrictions
on
the
maximum
number
of
disk
drives
that
can
be
supported
on
a
loop,
cabling
restrictions,
and
other
requirements.
v
SFP
module
ports:
The
EXP100
supports
large,
complex,
and
redundant
disk
drive
loop
configurations.
Each
ESM
has
two
SFP
module
ports.
Each
SFP
module
has
an
input
and
output
port.
A
loop
is
created
by
connecting
one
or
more
EXP100
expansion
enclosures
to
one
or
more
RAID
controllers.
v
Fibre
Channel
cable
restrictions:
RAID
controllers
use
specific
IBM
Fibre
Channel
options.
Refer
to
the
IBM
TotalStorage
DS4000
Hardware
Maintenance
Manual
and
Problem
Determination
Guide
or
your
IBM
representatives
or
resellers
for
the
cable
option
that
is
required
for
your
configuration.
v
Power
cabling:
The
EXP100
uses
two
standard
power
cables.
You
can
connect
the
power
cables
to
a
primary
power
unit
inside
the
rack,
such
as
a
properly
grounded
ac
distribution
unit
or
uninterruptible
power
supply.
You
can
also
connect
the
power
cable
to
an
external
source,
such
as
a
properly
grounded
electrical
outlet.
Note:
To
ensure
maximum
availability
of
power
to
your
EXP100,
do
not
connect
both
the
left
and
right
power
supplies
to
the
same
power
circuit
or
power
source.
46
IBM
TotalStorage
DS4000
EXP100
Storage
Expansion
Enclosure:
Installation,
User’s
and
Maintenance
Guide
Summary of Contents for TotalStorage EXP100
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