To
create
the
redundant
loop
shown
in
you
would
perform
the
following
steps:
1.
Make
two
Fibre
Channel
connections
from
the
First
expansion
enclosure
to
the
Second
expansion
enclosure
(connections
1
and
2).
2.
Make
two
Fibre
Channel
connections
from
the
Second
expansion
enclosure
to
the
Third
expansion
enclosure
(connections
3
and
4).
3.
Continue
making
Fibre
Channel
connections
in
this
manner
until
you
have
connected
all
new
expansion
enclosures
(connections
5
and
6
in
this
case).
You
can
connect
up
to
eight
EXP100s
together
in
a
redundant
drive
loop.
4.
Make
a
Fibre
Channel
connection
from
the
DS4000
drive
port
to
the
OUT
port
in
the
left
ESM
of
the
First
expansion
enclosure
in
the
redundant
drive
loop.
5.
Make
a
Fibre
Channel
connection
from
the
DS4000
drive
port
to
the
IN
port
in
the
right
ESM
of
the
Last
expansion
enclosure
in
the
redundant
drive
loop.
IBM
SATA
disk
drives
are
dual-ported,
providing
individual
access
from
two
Fibre
Channel
loops
to
the
same
disk
drive.
When
configuring
the
ESMs,
configure
the
second
ESM
the
same
way
that
you
configured
the
first
ESM.
Refer
to
the
Fibre
Channel
Cabling
Instructions
that
come
with
your
DS4000
storage
subsystem
for
more
information
about
dual-loop
support
and
implementation.
1
2
3
4
5
6
7
8
Left ESM board
Input
Last expansion unit
Third expansion unit
First expansion unit
DS4300 Storage Server
with two RAID controllers
Second expansion unit
Loop B Fibre Channel
interface cable
Loop A Fibre Channel
interface cable
Output
Output
Right ESM board
Figure
41.
EXP100
redundant
loop
configuration
Chapter
2.
Installing
the
EXP100
57
Summary of Contents for TotalStorage EXP100
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