Attention:
The
fans
in
your
expansion
enclosure
draw
in
fresh
air
and
force
out
hot
air.
These
fans
are
hot-swappable
and
redundant;
however,
when
one
fan
fails,
the
fan
unit
must
be
replaced
within
48
hours
to
maintain
redundancy
and
optimum
cooling.
When
you
remove
the
failed
unit,
be
sure
to
install
the
replacement
fan
unit
within
10
minutes
to
prevent
overheating.
v
Fan
CRUs:
The
two
fan
CRUs
are
located
at
the
back
of
the
expansion
enclosure.
These
fan
units
are
hot-swappable
and
redundant.
v
Latches
and
handles:
Use
the
latches
and
handles
to
remove
or
install
the
fan
CRUs.
v
Fault
LED:
The
amber
fan
Fault
LED
lights
if
a
fan
failure
occurs.
ESMs
and
user
controls
The
EXP100
has
two
hot-swappable
and
redundant
ESM
units.
The
ESMs
are
located
at
the
back
of
the
expansion
enclosure.
One
ESM
will
continue
to
operate
if
the
other
ESM
fails.
The
ESMs
contain
the
expansion
enclosure
control
logic,
interface
ports,
and
LEDs.
Each
ESM
has
two
SFP
module
ports
that
you
use
to
connect
the
expansion
enclosure
to
the
controller.
The
EXP100
ESMs
and
user
controls
are
shown
in
Attention:
v
With
the
combination
of
controller
firmware
version
05.41.5x.xx,
6.1x.xx.xx,
or
later,
and
ESM
firmware
versions
9554,
956x,
or
later,
the
EXP100
provides
full
failover
capability.
If
one
ESM
within
the
EXP100
expansion
enclosure
fails,
the
surviving
ESM
provides
data
paths
to
all
14
drives
in
the
EXP100
expansion
enclosures.
Therefore,
for
full
failover
capability,
ensure
that
you
have
the
latest
firmware
levels.
Keep
in
mind
that
R1
LHA
-
to
-
R3
FHA
firmware
upgrades
must
be
performed
when
there
are
no
I/Os
to
the
DS4000,
so
you
must
schedule
down
time
for
the
upgrade
process.
v
The
400
GB
SATA
drive
options
require
ESM
firmware
level
956x
or
later.
IBM
strongly
recommends
that
you
check
and
maintain
the
DS4000
storage
subsystem
controller
firmware
and
EXP100
ESM
firmware
at
the
latest
levels
posted
on
the
IBM
DS4000
storage
subsystem
support
Web
site.
This
ensures
compatibility
when
existing
SATA
hard
drives
need
to
be
replaced
with
the
new
drive
options
or
SATA
drive
CRUs.
See
for
a
more
detailed
explanation
of
the
failover
architecture.
Also,
see
for
the
latest
firmware
information.
1 Gb/s
2 Gb/s
X10
X1
Tray Number
Conflict
Fan CRU
Handle
Fault LED
Latch
Latch
Fault LED
Handle
Fan CRU
Figure
5.
Fan
controls
and
indicators
Chapter
1.
Introduction
19
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Summary of Contents for TotalStorage EXP100
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