System reliability guidelines, Working inside the server with the power on, System – Lenovo 6446 User Manual
Page 22: Reliability, Guidelines, Working, Inside, Server, With, Power
v
You
do
not
have
to
turn
off
the
server
to
install
or
replace
hot-swap
fans,
redundant
hot-swap
ac
power
supplies,
or
hot-plug
Universal
Serial
Bus
(USB)
devices.
However,
you
must
turn
off
the
server
before
performing
any
steps
that
involve
removing
or
installing
adapter
cables
or
non-hot-swap
optional
devices
or
components.
Attention:
In
a
dc
power
environment,
only
trained
service
personnel
other
than
Lenovo
service
technicians
are
authorized
to
connect
or
disconnect
power
to
the
dc
power
supply
and
to
install
and
remove
a
dc
power
supply.
See
the
documentation
that
comes
with
each
dc
power
supply.
v
Blue
on
a
component
indicates
touch
points,
where
you
can
grip
the
component
to
remove
it
from
or
install
it
in
the
server,
open
or
close
a
latch,
and
so
on.
v
Orange
on
a
component
or
an
orange
label
on
or
near
a
component
indicates
that
the
component
can
be
hot-swapped,
which
means
that
if
the
server
and
operating
system
support
hot-swap
capability,
you
can
remove
or
install
the
component
while
the
server
is
running.
(Orange
can
also
indicate
touch
points
on
hot-swap
components.)
See
the
instructions
for
removing
or
installing
a
specific
hot-swap
component
for
any
additional
procedures
that
you
might
have
to
perform
before
you
remove
or
install
the
component.
v
When
you
are
finished
working
on
the
server,
reinstall
all
safety
shields,
guards,
labels,
and
ground
wires.
v
For
a
list
of
supported
optional
devices
for
the
server,
see
System
reliability
guidelines
To
help
ensure
proper
cooling
and
system
reliability,
make
sure
that
the
following
requirements
are
met:
v
Each
of
the
drive
bays
has
a
drive
or
a
filler
panel
and
electromagnetic
compatibility
(EMC)
shield
installed
in
it.
v
If
the
server
has
redundant
power,
each
of
the
power-supply
bays
has
a
power
supply
installed
in
it.
v
There
is
adequate
space
around
the
server
to
allow
the
server
cooling
system
to
work
properly.
Leave
approximately
50
mm
(2.0
in.)
of
open
space
around
the
front
and
rear
of
the
server.
Do
not
place
objects
in
front
of
the
fans.
For
proper
cooling
and
airflow,
replace
the
server
cover
before
turning
on
the
server.
Operating
the
server
for
extended
periods
of
time
(more
than
30
minutes)
with
the
server
cover
removed
might
damage
server
components.
v
You
have
followed
the
cabling
instructions
that
come
with
optional
adapters.
v
You
have
replaced
a
failed
fan
within
48
hours.
v
You
have
replaced
a
hot-swap
drive
within
2
minutes
of
removal.
v
You
do
not
operate
the
server
without
the
air
baffles
installed.
Operating
the
server
without
the
air
baffles
might
cause
the
microprocessors
to
overheat.
v
Microprocessor
socket
2
always
contains
either
a
heat-sink
filler
or
a
microprocessor
and
heat
sink.
Working
inside
the
server
with
the
power
on
Attention:
Static
electricity
that
is
released
to
internal
server
components
when
the
server
is
powered-on
might
cause
the
server
to
halt,
which
could
result
in
the
loss
of
data.
To
avoid
this
potential
problem,
always
use
an
electrostatic-discharge
wrist
strap
or
other
grounding
system
when
working
inside
the
server
with
the
power
on.
8
ThinkServer
RD120
Types
6444,
6445,
6446,
and
6447:
Installation
Guide