NEC N8405-019, User Manual

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Power Control Policy
Specify the control policy on the maximum power consumption in the power management provided
by the EM card. The power control policy includes three modes, or "CPU performance", "maintain
redundancy" and "recover redundancy" modes. The default setting is the [CPU performance mode].
NOTE:
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.
(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.)
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. (When a
power supply unit is defected further in no power redundancy status,
the system may be shut down forcibly.)
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. (However, depending on operations of
CPU blades, the EM card cannot reduce the power consumption to the
value allowing the power redundancy to be recovered.)