DS4400
Power
Power supply
Controller fan
Controller
Fast write cache
v
If
the
green
power
indicator
is
on
and
the
amber
fault
indicator
is
off,
go
to
Step
8.
v
If
the
green
power
indicator
remains
off
or
the
fault
indicator
is
on
after
a
few
seconds,
make
sure
that
the
controller
CRU
is
locked
into
place.
If
the
fault
indicator
remains
on,
go
to
Step
6.
6.
Use
the
storage-management
software
to
check
the
status
of
both
controllers.
If
applicable,
perform
the
recovery
procedures
required
by
the
software.
If
this
corrects
the
fault
and
the
DS4400
Storage
Server
is
operating
without
error,
go
to
Step
8.
If
not,
go
to
Step
7.
7.
Reinsert
the
controller
CRU.
Then,
if
there
are
no
error
messages
or
controller
faults,
go
to
Step
8
If
there
is
still
a
problem,
call
for
service.
8.
Replace
the
DS4400
Storage
Server
bezel,
as
shown
in
Figure
22
on
page
23.
Battery
The
battery
CRU
contains
rechargeable
batteries
and
a
battery-charger
board.
The
battery
CRU
plugs
into
the
front
of
the
DS4400
Storage
Server
(see
Figure
36
on
page
47)
where
it
provides
backup
power
to
the
cache
memory
in
both
controllers.
During
a
power
outage,
a
properly
charged
battery
CRU
maintains
electrical
current
to
the
controllers
for
up
to
five
days
with
1
Gb
cache
memory
installed.
All
data
stored
in
memory
is
preserved
as
long
as
the
batteries
can
sustain
power
to
the
cache
memory.
However,
the
battery
does
not
provide
power
to
the
rest
of
the
system
during
a
power
outage.
Therefore,
the
system
is
not
able
to
write
data
to
hard
disk
drives
without
a
backup
power
source.
Servicing
notes
Consider
the
following
when
servicing
the
battery
in
the
DS4400
Storage
Server:
v
The
battery
has
a
three-year
life
expectancy.
Replace
the
battery
every
three
years
or
whenever
it
fails
to
hold
a
charge.
Operating
the
DS4400
Storage
Server
in
an
unsupported
environment
(above
35°
C
or
95°
F)
lowers
the
life
expectancy
of
the
battery.
v
The
service
label
on
the
battery
provides
a
blank
line
for
recording
the
date
on
which
the
battery
was
last
serviced
(see
Figure
37
on
page
48).
Check
this
label
to
determine
when
to
replace
the
battery.
For
information
about
using
the
software
to
track
battery
age,
refer
to
the
IBM
DS4000
Storage
Manager
documentation
and
online
help.
v
When
a
battery
fails,
the
fault
light
on
the
battery
is
lit.
For
more
information
about
indicator
lights,
see
“Battery
indicator
lights”
on
page
31.
v
If
you
replace
the
battery
and
still
experience
battery
problems
(for
example,
loss
of
battery
power
to
the
controllers
or
batteries
not
charging
properly),
the
DS4400
Figure
35.
Indicator
lights
on
the
DS4400
Storage
Server
bezel
44
IBM
TotalStorage
DS4400
Fibre
Channel
Storage
Server:
User’s
Guide
Summary of Contents for TotalStorage DS4400
Page 1: ...IBM TotalStorage DS4400 Fibre Channel Storage Server User s Guide GC26 7730 00...
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Page 8: ...vi IBM TotalStorage DS4400 Fibre Channel Storage Server User s Guide...
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Page 124: ...Printed in USA GC26 7730 00...
