Storage
expansion
enclosure
features
The
following
features
are
available
with
this
product.
Table
12.
Storage
expansion
enclosure
features
Power
supply
v
Two
400
W
hot-pluggable
power
supplies
v
Power
supplies
are
accessible
from
the
rear
using
camming
levers
or
latches.
v
Two
ac
line
cords
v
Two
9-ft
jumper
cords
v
On/off
switch
on
the
back
of
each
power
supply
v
14
disk
drives
run
continuously
from
a
single
power
supply.
Two
fan
units
v
Hot
pluggable
fan
units
accessible
from
the
rear
of
the
storage
expansion
enclosure,
one
on
each
side
v
Two
fan
units,
with
two
fans
per
unit,
for
a
total
of
four
fans.
The
fans
are
redundant,
meaning
that
if
one
fan
is
disabled
the
remaining
three
fans
continue
to
cool
the
storage
expansion
enclosure.
Environmental
service
module
(ESM)
v
Two
ESMs
are
accessible
from
the
back
of
the
storage
expansion
enclosure.
v
ESMs
are
hot
pluggable.
v
ESMs
are
redundant.
Heat
output,
airflow,
and
cooling
The
maximum
heat
output
of
the
storage
expansion
enclosure
is
390
watts
(1088
BTU/hr).
Each
rack-mounted
storage
expansion
enclosure
requires
an
airflow
of
2.5
m
3
(87
ft
3
)
per
minute.
The
input
air
temperature
to
all
racks
should
be
in
the
range
10°
C
-
35°
C
(50°
F
-
95°
F).
Note:
In
general,
storage
expansion
enclosure
reliability
tends
to
decrease
as
the
ambient
temperature
of
the
environment
in
which
it
is
being
used
increases.
The
ambient
temperature
in
the
immediate
area
of
the
storage
expansion
enclosure
should
be
kept
near
22
degrees
C
(72
degrees
F),
or
lower,
to
provide
better
reliability.
When
racks
that
contain
many
storage
expansion
enclosures
are
to
be
installed
together,
the
following
requirements
must
be
met
to
ensure
that
the
storage
expansion
enclosures
are
adequately
cooled:
v
Air
enters
at
the
front
of
the
rack
and
leaves
at
the
back.
To
prevent
the
air
that
is
leaving
the
rack
from
entering
the
intake
of
another
piece
of
equipment,
you
must
position
the
racks
in
alternate
rows,
back-to-back
and
front-to-front.
This
arrangement
is
known
as
“cold
aisle/hot
aisle”
and
is
shown
in
v
Where
racks
are
in
rows,
each
rack
must
touch
the
rack
that
is
next
to
it
to
reduce
the
amount
of
hot
air
that
can
flow
around
from
the
back
of
the
rack
into
the
intakes
of
the
storage
expansion
enclosures
that
are
in
that
rack.
You
should
use
Suite
Attach
Kits
to
completely
seal
any
gaps
that
remain
between
the
racks.
For
details
about
Suite
Attach
Kits,
contact
your
marketing
representative.
v
Where
racks
are
in
rows
front-to-front
or
back-to-back,
a
gap
of
at
least
1220
mm
(48
in.)
must
separate
the
rows
across
the
cold
aisle.
14
IBM
TotalStorage
DS4000
EXP700
and
EXP710
Storage
Expansion
Enclosures:
Installation,
User’s,
and
Maintenance
Guide
Summary of Contents for TotalStorage DS4000 EXP710
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