3Com 4007, Getting Started Manual

Page: 70 / 92

70 A
PPENDIX
B: I
NTELLIGENT
P
OWER
S
UBSYSTEM
Operate the Switch 4007 in power fault-tolerant
mode to ensure that power that is equivalent to at
least one power supply is available to replace power
that is lost if a single power supply fails.
To set the Switch 4007 to power fault-tolerant mode
or to power non-fault-tolerant mode, enter the
set
power mode
command at the EME prompt.
When you attempt to set the Switch 4007 to power
fault-tolerant mode, EMEs determine if there is
sufficient unallocated power budget available to
place power that is equivalent to one power supply in
reserve.
■
If there is sufficient unallocated power budget, the
Switch 4007 sets to power fault-tolerant mode.
■
If there is insufficient unallocated power budget,
the Switch 4007 remains in power
non-fault-tolerant mode.
To prevent management modules from automatically
disabling power fault-tolerant mode in response to a
power supply failure, ensure that two power supplies
are installed. If a power supply failure occurs under
any condition, an alert is sent to the management
application.
Non-Fault Tolerant Mode
A user-selectable mode in which 100 percent of the
power that can be allocated to all modules is available
to them (no power is held in reserve). This is the
default mode for power supplies as shipped.
While the switch is running in power
non-fault-tolerant mode, the amount of power that is
available to modules is determined by the number
and type of power supplies that are installed.
If a power supply fails while the chassis is running in
power non-fault-tolerant mode:
■
Installed management modules may shut down
selected Switch 4007 interface modules and
switch fabric modules in an attempt to bring
installed module power consumption under the
now-reduced power budget.
■
Installed interface modules and switch fabric
modules continue to operate without interruption
if the output of remaining installed power supplies
is sufficient to provide adequate power to all
installed modules.