Owner's Manual

file:///T|/htdocs/SOFTWARE/smdrac3/cmc/cmc1.20/en/readme/CMC_120_A00_README_final.txt[10/26/2012 2:28:35 PM]
Chassis Infrastructure. The value for surplus for peak performance is indicated
in both the watts and BTU/h units.
Redundancy Policy: Displays the current redundancy configuration: AC Redundancy,
Power Supply Redundancy, or No Redundancy.
* AC Redundancy: Power input is load-balanced across all supplies. Three of the
power supplies are connected to one AC grid, while the other three are connected
to another AC grid. When the system is running optimally in AC Redundancy
mode, power is load-balanced across all active supplies. In case of failure,
the power supplies on the functioning AC grid take over at 100% capacity.
NOTE: In AC Redundancy mode, a difference in the number of power supplies between
the two AC circuits (for example, three power supplies on one AC circuit and
two on the other AC circuit) will cause degradation in the redundancy.
* Power Supply Redundancy: The capacity of the highest-rated power supply in the chassis
is kept as a spare, ensuring that a failure of any one power supply will not cause the
server modules or chassis to power-down.
Power Supply Redundancy mode does not use all six power supplies; it uses a maximum
of four power supplies. Power supplies in excess of four do not participate in Power
Supply Redundancy unless there is a failure or removal of one of the power supplies.
* No Redundancy: Power from all three power supplies on one AC circuit (grid) is used
to power-on the entire chassis, including the chassis, servers, I/O modules, iKVM,
and CMC.
NOTE: The No Redundancy mode uses only three power supplies at a time,
without backup. Failure of one of the three power supplies being used could cause the
server modules to lose power and data.
Dynamic Power Supply Engagement: Displays whether Dynamic Power Supply Engagement
is enabled or disabled. Enabling this feature allows the CMC to put under-utilized
power supplies into standby mode based on the redundancy policy that is set and the
power requirements of the system. Putting under-utilized power supplies into standby
mode increases the utilization of active power supplies and thus the efficiency of the
online supplies, saving power. (234463)
* The help for the Chassis - Power Management - Configuration - Configuring Power Budget
and Redundancy section in the localized languages should read as follows:
* Surplus for Peak Performance: The surplus for peak performance value is the
difference between the System Input Power Cap and the Power Required for Peak
Performance (sum of the Maximum Input Power Allocated to Servers and the Maximum
Input Power Allocated to Chassis Infrastructure). The value for surplus for peak
performance is indicated in both the watts and BTU/h units.
* Power Required for Peak Performance: The power required for peak performance value
is the sum of the Maximum Input Power Need of Servers that are powered on and the
Input Power Allocated to Chassis Infrastructure. The value for power required for
peak performance is indicated in both the watts and BTU/h units. If System Input
Power Cap is set to less than Power Required for Peak Performance, some servers
may throttle under extreme load.