© Copyright Lenovo 2018
Chapter 2: Installing and Removing the NE2552E
17
System Reliability Guidelines
To
help
ensure
proper
cooling,
performance,
and
system
reliability,
make
sure
that
the
following
requirements
are
met:
Each
of
the
bays
on
the
rear
of
the
Lenovo
Flex
System
chassis
contains
either
a
module
or
a
filler
module.
A
removed
hot
‐
swap
module
is
replaced
with
an
identical
module
or
filler
module
within
one
minute
of
removal.
A
removed
hot
‐
swap
compute
node
is
replaced
with
another
compute
node
or
filler
node
within
one
minute
of
removal.
The
ventilation
areas
on
the
sides
of
the
compute
node
are
not
blocked.
You
have
followed
the
reliability
guidelines
in
the
documentation
that
comes
with
the
Lenovo
Flex
System
chassis.
Handling Static-Sensitive Devices
Attention:
Static
electricity
can
damage
the
switch
and
other
electronic
devices.
To
avoid
damage,
keep
static
‐
sensitive
devices
in
their
static
‐
protective
packages
until
you
are
ready
to
install
them.
To
reduce
the
possibility
of
electrostatic
discharge,
observe
the
following
precautions:
Limit
your
movement.
Movement
can
cause
static
electricity
to
build
up
around
you.
The
use
of
a
grounding
system
is
recommended.
For
example,
wear
an
electrostatic
‐
discharge
wrist
strap,
if
one
is
available.
Handle
the
device
carefully,
holding
it
by
its
edges
or
its
frame.
Do
not
touch
solder
joints,
pins,
or
exposed
printed
circuitry.
Do
not
leave
the
device
where
others
can
handle
and
damage
it.
While
the
device
is
still
in
its
static
‐
protective
package,
touch
it
to
an
unpainted
metal
part
of
any
unpainted
metal
surface
on
a
grounded
rack
component
in
the
rack
in
which
you
are
installing
the
device,
for
at
least
two
seconds.
This
drains
static
electricity
from
the
package
and
from
your
body.
Remove
the
device
from
its
package
and
install
it
directly
into
the
switch
without
setting
it
down.
If
it
is
necessary
to
set
down
the
device,
put
it
back
into
its
static
‐
protective
package.
Do
not
place
the
device
on
a
switch
cover
or
on
a
metal
surface.
Take
additional
care
when
you
handle
devices
during
cold
weather.
Heating
reduces
indoor
humidity
and
increases
static
electricity.
Some
types
of
Lenovo
Flex
System
chassis
come
with
electrostatic
discharge
(ESD)
connectors.
If
your
unit
is
equipped
with
an
ESD
connector,
see
the
documentation
that
comes
with
the
Lenovo
Flex
System
chassis
for
using
the
ESD
connector.
