Attention:
Diagnostic
tests
can
temporarily
lock
the
transmit
and
receive
speed
of
the
links
during
diagnostic
testing.
For
information
about
specific
diagnostic
tests,
refer
to
the
Fabric
OS
Administrator’s
Guide
.
Customer
field
replaceable
units
(CRUs/FRUs)
In
addition
to
the
SFPs,
the
only
customer
field
replaceable
units
(CRUs/FRUs)
are
the
integrated
power
supply
fan
assemblies.
The
fans
are
fixed
inside
the
integrated
power
supply/fan
FRU
to
provide
necessary
airflow
to
cool
the
whole
system.
The
system
software
sets
fan
speed
and
measures
their
speeds
through
the
tachometer
interface.
The
two
power
supply/fan
assembly
FRU
units
are
hot-swappable
if
replaced
one
at
a
time.
They
are
identical
and
fit
into
either
slot
and
can
be
replaced
onsite
without
the
use
of
special
tools.
The
power
supplies/fan
assemblies
units
are
keyed
to
ensure
correct
orientation
during
installation.
When
either
the
power
supply
component
or
one
of
the
fans
fails,
the
entire
assembly
must
be
replaced.
Individual
components
cannot
be
replaced.
Attention:
Disassembling
any
part
of
the
power
supply
and
fan
assembly
voids
the
warranty
and
regulatory
certifications.
There
are
no
user-serviceable
parts
inside
the
power
supply
and
fan
assembly.
Because
the
cooling
system
relies
on
pressurized
air,
do
not
leave
any
of
the
fan
assembly
slots
empty
longer
than
two
minutes
while
the
switch
is
operating.
If
a
fan
assembly
fails,
leave
it
in
the
switch
until
it
can
be
replaced.
Maintain
all
fan
assemblies
in
operational
condition
to
provide
redundancy.
These
power
supply/fan
assemblies
are
redundant,
but
should
be
replaced
as
soon
as
possible
to
avoid
any
system
shutdown
or
data
loss.
Each
power
supply/fan
unit
contains
two
fans,
which
will
automatically
switch
to
high
speed
if
the
other
power
supply
unit
fails.
Refer
to
Table
8
on
page
25
for
interpreting
the
power
supply
LEDs
and
recommended
actions
before
replacing
the
unit.
Fabric
OS
identifies
the
fans
from
left
to
right
when
viewed
from
the
nonport
side
as
Fan
assembly
#2
and
Fan
assembly
#1.
Any
of
the
following
methods
can
be
used
to
determine
whether
a
power
supply
has
failed
and
requires
replacing:
v
Check
the
power
supply
status
LED
next
to
the
I/O
switch.
If
the
power
supply
status
LED
is
not
on,
verify
that
the
power
supply
is
on
and
seated
and
the
power
cord
is
connected
to
a
functioning
power
source.
If
the
light
does
not
turn
green,
the
power
supply
needs
to
be
replaced.
v
In
Web
Tools,
click
the
Power
Status
icon.
v
Type
the
psShow
command
at
the
command
prompt
to
display
power
supply
status
as
shown
below:
switch:admin>
psshow
Power
Supply
#1
is
OK
Power
Supply
#2
is
OK
Any
of
the
following
methods
can
be
used
to
determine
whether
a
fan
has
failed
and
requires
replacing:
v
Check
the
system
status
LED
(see
Figure
9
on
page
22).
If
the
system
status
LED
is
flashing
amber
and
green,
it
could
mean
the
fan
has
failed.
The
green
power
supply/fan
LED
will
also
flash
in
the
event
of
failure.
Check
the
management
interface
and
the
error
log
for
details
on
the
cause
of
status.
Chapter
3.
Operating
the
switch
31
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