After
pressing
the
release
latch
on
the
information
panel,
you
can
slide
the
light
path
diagnostics
panel
out
to
view
the
lit
LEDs.
The
LEDs
indicate
the
type
of
error
that
has
occurred.
See
“MAP
5800:
Light
path”
in
the
IBM
System
Storage
SAN
Volume
Controller:
Service
Guide
for
more
detail.
To
retract
the
panel,
push
it
back
into
the
node
and
snap
it
into
place.
System-error
LED
When
it
is
lit,
the
system-error
LED
indicates
that
a
system-board
error
has
occurred.
This
amber
LED
lights
up
if
the
SAN
Volume
Controller
hardware
detects
a
fatal
error
that
requires
a
new
field
replaceable
unit
(FRU).
Note:
See
“MAP
5800:
Light
path”
in
the
IBM
System
Storage
SAN
Volume
Controller:
Service
Guide
to
help
you
to
isolate
the
faulty
FRU.
A
system-led
error
LED
is
also
on
the
rear
of
the
SAN
Volume
Controller.
Information-Error
LED
When
the
information-error
LED
is
lit,
a
non-critical
event
has
occurred.
Check
the
light
path
diagnostics
panel
and
the
error
log.
Light
path
diagnostics
are
described
in
more
detail
in
the
light
path
maintenance
analysis
procedure
(MAP).
Location
LED
The
SAN
Volume
Controller
does
not
use
the
location
LED.
Hard
disk
drive
activity
LED
When
it
is
lit,
the
green
hard
disk
drive
activity
LED
indicates
that
the
hard
disk
drive
is
in
use.
Hard
disk
drive
activity
is
shown
on
the
hard
disk
drive
activity
LED.
For
the
SAN
Volume
Controller
2145-8F2,
hard
disk
drive
activity
is
also
shown
on
the
hard
disk
drive
itself.
Power
control
button
The
power
control
button
switches
on
or
switches
off
the
main
power
to
the
SAN
Volume
Controller.
To
turn
on
the
power,
press
and
release
the
power
control
button.
To
turn
off
the
power,
press
and
release
the
power
control
button.
For
more
information
about
how
to
power
off
the
SAN
Volume
Controller
node,
see
“MAP
5350:
Powering
off
a
SAN
Volume
Controller
node”
in
the
IBM
System
Storage
SAN
Volume
Controller:
Service
Guide
.
Note:
When
the
node
is
operational
and
the
power
control
button
is
pressed,
the
SAN
Volume
Controller
indicates
on
its
front
panel
that
it
is
powering
off
and
writes
its
control
data
to
its
internal
disk.
This
can
take
up
to
five
minutes.
If
the
power
control
button
is
pressed
and
not
released,
an
immediate
power
off
is
performed
without
writing
the
SAN
Volume
Controller
control
data
to
disk.
Service
actions
are
then
required
to
make
the
SAN
Volume
Controller
operational
again.
Therefore,
when
powering
off,
you
should
not
press
and
hold
the
power
control
button
for
more
than
two
seconds.
70
IBM
System
Storage
SAN
Volume
Controller:
Hardware
Installation
Guide
Summary of Contents for 2145UPS-1U
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