NEC N8405-019, User Manual

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CPU performance mode
The "CPU performance" mode makes the EM card prioritize the operation performance
of CPU blades. In this mode, if the EM card cannot accept a new power request from a
CPU blade with the power redundancy maintained, the EM card releases the power
redundant configuration and permits the new power request from the CPU blade. Note,
however, this mode is not supported in [4+0] status in the power supply system
configured with four power supply units.
In the [N+N redundant mode], the electric power is not secured across the two power
supply systems. With the power system in which two power supply units are installed
in each system, the power shortage will occur if a new power request from the CPU
blade exceeds the capability of two power supply units. The EM card does not secure
the power equivalent to three power supply units across the two systems.
IMPORTANT:
If a power supply unit is defected during operation
under the release of the power redundant configuration, then the system
may be forcibly shut down.
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Maintain redundancy mode
The "maintain redundancy" mode makes the EM card accept a new power request from
a CPU blade within the range allowing the power redundancy to be maintained. If the
EM card cannot accept a new power request from a CPU blade with the power
redundancy maintained, the EM card denies the request. In the "maintain redundancy"
mode, any measures is not taken if the power redundancy is lost due to an event such as
a failure of a power supply unit.
IMPORTANT:
When a power supply unit is defected further in no
power redundancy status, the system may be shut down forcibly.
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Recover redundancy mode
The "recover redundancy" mode makes the EM card accept a new power request from
a CPU blade within the range allowing the power redundancy to be maintained and
limit the operation performance of CPU blades to suppress the power consumption for
recovery of the power redundancy if the redundancy is lost due to an event such as a
failure of a power supply unit.
IMPORTANT:
Depending on operations of CPU blades, the EM card
cannot reduce the power consumption to the value allowing the power
redundancy to be recovered.