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Table
32.
DS4300
storage
server
fan
LED
LED
Color
Operating
states
1
Fault
Amber
v
Off
-
Normal
operation
v
On
-
The
fan
FRU
failed.
1
Always
use
the
storage
management
software
to
identify
the
failure.
Table
33.
DS4300
storage
server
power
supply
LEDs
LED
Color
Operating
states
1
Fault
Amber
v
Off
-
Normal
operation
v
On
-
One
of
the
following
situations
has
occurred:
–
The
power
supply
failed.
–
An
overtemperature
condition
has
occurred.
–
The
power
supply
is
turned
off.
Power
Green
v
On
-
Normal
operation
v
Off
-
One
of
the
following
situations
has
occurred:
–
The
power
supply
is
disconnected.
–
The
power
supply
is
seated
incorrectly.
–
The
storage
server
has
no
power.
1
Always
use
the
storage
management
software
to
identify
the
failure.
Cache
memory
and
RAID
controller
battery
Each
RAID
controller
contains
128
MB
of
cache
data.
It
also
contains
a
rechargeable
battery
that
maintains
data
in
the
cache
in
the
event
of
a
power
failure.
The
following
sections
describe
these
features
and
their
associated
LEDs.
Cache
memory
Cache
memory
is
memory
on
the
RAID
controller
that
is
used
for
intermediate
storage
of
read
and
write
data.
Using
cache
memory
can
increase
system
performance.
The
data
for
a
read
operation
from
the
host
might
be
in
the
cache
memory
from
a
previous
operation
(thus
eliminating
the
need
to
access
the
drive
itself),
and
a
write
operation
is
completed
when
it
is
written
to
the
cache,
rather
than
to
the
drives.
Power supply
fault LEDs
Power LED
Fan fault LED
Fan fault LED
Power LED
Figure
52.
DS4300
storage
server
fan
and
power
supply
LEDs
74
IBM
TotalStorage
DS4000:
Hardware
Maintenance
Manual
Содержание System Storage DS4000
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