power
supplies
are
required
to
run
a
completely
loaded
chassis.
Therefore,
if
one
ac
input
fails,
and
all
power
supply
modules
are
populated,
the
chassis
continues
to
run
uninterrupted.
If
a
power
supply
module
fails,
the
remaining
power
supply
modules
continue
to
provide
uninterrupted
power
to
the
chassis.
The
power
supplies
are
plugged
directly
into
their
power
bays
to
an
internal
blind
connector.
Each
blade
assembly
has
separate
dc-dc
converter
bricks
for
each
voltage
that
is
required.
This
allows
local
regulation
at
the
blade
assembly,
and
provides
for
future
flexibility
to
match
voltage
needs
with
blade
assembly
type.
To
maximize
system
availability
when
the
switch
blade
assembly
is
plugged,
it
is
initially
powered
off
by
the
hardware.
This
ensures
that
adding
a
blade
assembly
does
not
bring
the
whole
switch
down
if
inadequate
power
is
available.
The
system
confirms
sufficient
power
for
the
new
module
and
then
applies
power.
If
sufficient
power
is
not
available
(for
example,
if
only
one
of
the
possible
four
power
supplies
are
installed),
the
system
does
not
allow
more
than
four
switch
blade
assemblies
plus
two
CP
blades
to
be
powered
up.
2N
power
architecture
The
2N
power
architecture
is
designed
to
protect
against
the
loss
of
ac
power.
The
M12
and
M14
switches
offers
four
power
supply
modules
to
assure
maximum
availability.
Under
normal
operating
conditions,
only
two
power
supplies
are
needed
for
full
system
operation.
However,
to
ensure
redundancy,
two
additional
power
supplies
are
available
and
are
added
in
pairs,
one
per
ac
source.
Table
3
shows
various
supported
power
supply
configurations
and
their
respective
levels
of
redundancy.
Table
3.
Power
supply
configurations
Number
of
power
supplies
Number
of
power
cords
Number
of
switch
blades
Number
of
CP
blades
Number
of
blowers
Redundancy
1
1
4
2
3
No
2
1
4
or
8
2
3
Partial
3
2
4
2
3
Yes
4
2
8
2
3
Yes
4
2
8
2
3
Yes
Note:
A
single
power
cord
results
in
the
lack
of
ac
source
redundancy.
12
IBM
TotalStorage
SAN
Switch:
2109
Model
M12
and
Model
M14
User’s
Guide
Summary of Contents for TotalStorage 2109 M12
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