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Allowing you to implement fault-tolerant power,
which allows the chassis to reserve some of its
power capacity to protect against a power supply
failure.
To support redundancy, install one or more power
supplies beyond the minimum number that is
required to support the chassis and its modules
(n + 1 redundancy).
Power Supply Modes
The CoreBuilder 9000 Enterprise Switch runs in either
of two power supply modes:
Power Fault Tolerant
Power Non-Fault-Tolerant
For optimal power redundancy in either power mode,
run the CoreBuilder 9000 Enterprise Switch with at
least one power supply more than the minimum
number that is required to operate all installed
modules and all modules that you plan to install.
Fault-tolerant mode — A user-selectable mode in
which power that is equivalent to one power supply is
held in reserve. This reserve power is not available to
installed modules until a power supply fails, or until
you switch the power mode from power
fault-tolerant mode to power non-fault-tolerant
mode.
While the chassis is running in fault-tolerant mode:
All installed power supplies are functioning and
contributing power to the chassis and modules.
Power Supply Modes
No single power supply is a dedicated standby
power supply.
Rather, a factory-defined power limit (which is
based on the number of installed power supplies)
ensures that power that is equivalent to at least
one power supply is available to replace power
that is lost when a power supply fails.
The amount of power that installed modules in a
chassis require must not be greater than the
number of installed power supplies, minus one
(n-1). When you reserve power that is equivalent
to one power supply in power fault-tolerant mode,
the failure of a single power supply has no impact
on installed modules that are already powered on.
If a power supply fails while the Switch is running in
power fault-tolerant mode:
EMEs respond by automatically disabling power
fault-tolerant mode.
Power formerly reserved (unavailable to installed
modules) is made available by power class and slot
location to power-enabled CoreBuilder 9000
modules to prevent them from powering off (as an
attempt to bring power consumption under the
now-reduced power budget).
All modules that had power before the power
supply failure continue to receive power without
interruption.
Upon power supply recovery, the EME
automatically reenables power fault-tolerant
mode.
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