Chapter
15.
Replacing
the
Myrinet
2000
Gigabit
switch
The
2
Gb
Myrinet
switch
is
an
option
that
provides
high-speed
communication
between
the
storage
nodes
and
cluster
nodes,
over
an
optical
cable.
It
requires
a
Myrinet
switch
chassis
in
the
primary
cabinet
and
a
Myrinet
PCI
adapter
in
each
storage
node
and
cluster
node.
Myrinet
PCI
board
The
Myrinet
PCI
board
resides
in
the
cluster
and
storage
nodes.
Use
the
installation
procedures
in
the
applicable
server
documentation
to
replace
a
Myrinet
PCI
board.
The
GM
software
for
running
the
Myrinet
board
resides
in
the
cluster
and
storage
nodes,
so
no
new
installation
of
software
is
required
when
a
Myrinet
PCI
board
is
replaced.
Myrinet
switch
chassis
The
Myrinet
switch
contains
the
following
replaceable
components:
8-port
line
card
Provides
the
connections
to
the
storage
and
cluster
nodes.
The
line
cards
plug
into
slots
in
the
switch
chassis.
Management
Module
Manages
and
routes
the
Myrinet
traffic,
polling
the
ports
and
building
tables
to
control
the
addressing
of
messages.
Blower
module
Cools
the
Myrinet
Switch
Chassis
All
of
these
components
can
be
hot-swapped.
The
Myrinet
documentation
discusses
installation
of
these
components.
The
three
Myrinet
Chassis
sizes
available
are
described
in
Table
22.
Myrinet
Chassis
Sizes
and
Capacities
Slots
in
switch
Line
cards
Nodes
supported
EIA
slots
consumed
5
1-4
4-32
4
9
1-8
4-64
6
17
1-16
4-128
10
If
the
backplane
fails
in
the
Myrinet
switch,
you
must
replace
the
entire
switch
chassis.
Use
the
following
steps
to
replace
the
chassis:
1.
Make
sure
that
the
cluster
is
not
running
critical
applications.
2.
If
the
optical
cables
connected
to
the
switch
are
not
labeled,
place
labels
on
the
cables
so
they
can
be
located
to
their
respective
connectors
when
the
new
chassis
is
installed.
3.
Disconnect
the
optical
cables
from
the
connectors
on
the
Myrinet
switch.
You
do
not
need
to
power
down
or
change
the
configuration
of
the
switch
before
doing
this.
Note:
Be
sure
to
install
dust
caps
on
all
the
connectors
after
the
cables
are
removed.
©
Copyright
IBM
Corp.
2004
67
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