See
the
storage
management
software
documentation
for
information
on
how
to
set
cache
memory
options.
The
RAID
controller
has
a
Cache
active
LED
that
displays
the
current
status
of
the
cache.
The
LED
is
on
if
data
is
in
the
cache,
and
it
is
off
if
no
data
is
in
the
cache.
If
caching
is
enabled
and
the
Cache
active
LED
never
comes
on
during
I/O
activity,
it
indicates
that
the
cache
memory
failed
or
the
battery
failed
(the
green
Battery
LED
will
be
off).
Note:
Always
use
the
storage
management
software
to
check
your
cache
memory
settings
before
you
assume
a
hardware
failure.
On
the
DS4300
single-controller
storage
server
(model
6LU/6LX),
the
RAID
controller
cache
memory
is
used
for
storing
read
data
only.
The
controller
firmware
ignores
a
“write-cache
enabled”
setting.
This
protects
data
in
the
event
of
a
controller
failure,
which
would
cause
the
cache
to
be
inaccessible.
Figure
53
shows
the
location
of
the
Cache
active
LED
on
the
front
of
the
RAID
controller.
RAID
controller
cache
battery
Each
RAID
controller
contains
a
sealed,
rechargeable
4-volt
lead-acid
battery.
This
battery
provides
cache
backup
for
up
to
three
days
in
the
event
of
a
power
loss.
The
service
life
of
the
battery
is
three
years,
after
which
time
the
battery
must
be
replaced.
See
the
storage
management
software
for
information
on
how
to
view
and
set
the
battery
expiration
date.
Important:
The
replacement
RAID
controller
CRU
does
not
come
with
a
RAID
controller
cache
battery
installed,
nor
the
mounting
hardware
that
holds
the
battery
in
place
inside
the
RAID
controller.
You
must
remove
the
cache
battery
that
is
inside
the
existing
RAID
controller
that
you
are
replacing,
and
install
that
battery
inside
the
replacement
RAID
controller
CRU,
using
the
battery
unit
mounting
hardware
taken
from
the
existing
controller.
On
the
DS4300
model
6LU/6LX,
you
will
have
to
stop
all
I/O
to
the
storage
server
before
you
replace
the
battery.
The
steps
to
remove
and
replace
the
battery
are
included
in
the
IBM
TotalStorage
DS4300
Storage
Server
Installation
and
User’s
Guide
.
Each
RAID
controller
has
a
green
Battery
LED
on
the
back
that
indicates
the
following
battery
statuses:
v
The
LED
is
on
and
remains
steady
when
the
battery
is
fully
charged.
Cache
active
LED
Figure
53.
DS4300
storage
server
cache
active
LED
Chapter
9.
Type
1722
DS4300
Storage
Server
75
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