User's Guide

220
Power management
Configure the items for power redundancy mode, power control policy, and Power Unit Wait Time in
each enclosure
1. Power redundancy mode:
This specifies the power redundancy mode for the EM card‟s power management.
 N+N redundant mode: This mode achieves redundancy by separating each Power Unit
(PSU) into two groups. For example, PSU1, PSU2 and PSU3 constitute AC System 1, while
PSU4, PSU5 and PSU6 AC System 2.
 N+1 redundant mode: While treating each PSU as an independent component, this mode
achieves redundancy by exploiting one more PSUs than necessary to supply enough power.
The default is “N+1 redundant mode.”
2. Power control policy:
This specifies the policy of maximum electric power consumption for the EM card‟s power
management.
Three modes can be specified for the policy: CPU Performance Mode, Maintain Redundancy
Mode, and Recover Redundancy Mode.
The default is “CPU Performance Mode.”
 CPU performance mode: This mode prioritizes the performance of the CPU Blades.
When the power system cannot meet an additional power
requirement from a CPU Blade while maintaining power
redundancy, this mode cancels power redundancy to permit
the CPU Blade‟s additional power requirement.
IMPORTANT:
If the power units fail while redundancy is cancelled, the system may be forced to stop.
 Maintain redundancy mode: This mode manages additional power requirements from
CPU Blades within a limited amount of power available in a
redundant system. Any additional power requirement from a
CPU Blade that the power system cannot meet while
maintaining power redundancy is not permitted. This mode
does nothing when a power redundancy becomes void due
to a Power Unit failure.