v
Sufficient
room
in
front
of
the
front
EIA
flange
to
provide
bezel
clearance.
EIA-310-D
requires
this
space
to
be
a
minimum
of
49
mm
deep
v
Sufficient
room
behind
the
rear
of
the
rear
EIA
flanges
to
provide
room
for
cable
management
arms
and
cable
routing.
v
Rack
should
provide
an
adequate
flow
of
cooling
air
and
prevent
recirculation
of
warm
air
from
the
rear
to
the
front.
v
Racks
must
have
perforated
front
and
rear
doors.
v
Rack
weight
handling
capacity
should
be
sufficient
for
the
aggregate
weight
of
the
BladeCenter
units,
blade
servers,
power
distribution
units
and
power
cables.
v
Racks
need
to
be
stabilized
so
that
the
rack
does
not
become
unstable
when
fully
loaded.
Power
considerations
BladeCenter
units
have
redundant
power
modules.
AC
power
resources
must
be
adequate
to
not
only
supply
the
required
voltage
and
amperage,
but
should
also
be
designed
to
take
advantage
of
the
power
redundancy
provided
by
the
BladeCenter
unit.
Table
5
shows
how
power
is
provided
to
the
BladeCenter
components.
Table
5.
BladeCenter
power
modules
Component
Power
module
bays
Blade
Server
Bays
1
through
6
Ethernet
Switch
Modules
Management
Modules
Media
Tray
Fibre
Channel
Switch
Modules
Blowers
1,
2
Blade
Server
Bays
7
through
14
3,
4
To
take
advantage
of
the
BladeCenter
power
redundancy,
power
modules
1
and
3
should
be
connected
to
different
AC
power
sources
than
power
modules
2
and
4
including:
v
Building
AC
power
sources
v
Front
end
PDUs
v
Rack
PDUs.
Rack
requirements
Depending
on
how
many
BladeCenter
units
are
installed
in
a
rack
and
the
total
number
of
power
modules,
two
to
sixteen
power
distribution
units
(PDUs)
are
required.
Power
distribution
units
(PDUs)
Each
BladeCenter
unit
has
a
minimum
of
2
or
a
maximum
of
4
power
modules.
When
planning
for
AC
rack
power
distribution
be
sure
to
plan
for
enough
individual
power
feeds
and
PDUs
to
take
advantage
of
the
redundant
BladeCenter
power
supplies.
Chapter
4.
Installation
considerations
45
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