Raid controller cache battery, Raid, Controller – IBM Partner Pavilion DS4100 User Manual
Page 108: Cache, Battery, Active
Note:
Always
use
the
DS4000
Storage
Manager
client
to
check
your
cache
memory
settings
before
assuming
a
hardware
failure.
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
DS4000
Storage
Manager
client
for
information
on
how
to
view
and
set
the
battery
expiration
date.
Each
RAID
controller
has
a
green
Battery
LED
on
the
back
that
indicates
the
battery
status,
as
follows:
v
The
LED
is
on
and
remains
steady
when
the
battery
is
fully
charged.
v
The
LED
flashes
when
the
battery
is
charging
or
performing
a
self-test.
v
The
LED
is
off
if
the
battery
or
the
battery
charger
has
failed.
The
battery
performs
a
self-test
at
startup
and
every
25
hours
thereafter
(during
which
time
the
Battery
LED
flashes).
If
necessary,
the
battery
begins
recharging
at
that
time.
If
the
battery
fails
the
self-test,
the
Battery
LED
turns
off,
indicating
a
battery
fault.
Data
caching
starts
after
the
battery
completes
the
startup
tests.
shows
the
location
of
the
Battery
LED
on
the
front
of
the
RAID
controller.
Cache
active
LED
f10ug036
Figure
60.
Cache
active
LED
76
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