Users Guide

Server Power Reduction to Maintain Power Budget
CMC reduces power allocations of low-priority servers, when additional power is required to maintain the system power consumption
within the user-congured System Input Power Cap. For example, when a new server is engaged, CMC may decrease power to low-
priority servers to allow more power for the new server. If the amount of power is still insucient after reducing power allocations of the
lower priority servers, CMC lowers the performance of servers until sucient power is freed to power the new server.
CMC reduces server power allocation in two cases:
• Overall power consumption exceeds the congurable System Input Power Cap.
• A power failure occurs in a non-redundant conguration.
110V PSUs AC Operation
By default, the 110V PSU AC Operation feature is available. However, a combination of 110V and 220V operation is not supported. If CMC
detects that both voltages are input, one voltage value is selected and those power supplies connected to the other voltage level are
turned o and indicated as not functioning.
Remote Logging
Power consumption can be reported to a remote syslog server. Total chassis power consumption, minimum, maximum, and average power
consumption over a collection period can be logged. For more information about enabling this feature and conguring the collection or
logging interval, see Managing and Monitoring Power.
External Power Management
CMC power management is optionally controlled by the OpenManage Power Center (OMPC). For more information, see the OMPC User’s
Guide.
When external power management is enabled, OMPC manages:
• Server power of supported VRTX servers
• Server priority of supported VRTX servers
• System input power capacity
• Maximum power conservation mode
The CMC continues to maintain or manage:
• Redundancy policy
• Remote power logging
• Server performance over power redundancy
• Dynamic power supply engagement
OPMC then manages prioritization and power of supported VRTX server nodes in the chassis from the budget available after allocation of
power to chassis infrastructure and prior generation server nodes. Remote power logging is unaected by external power management.
After the Server Based Power Management Mode is enabled, the chassis is prepared for PM3 management. All supported VRTX server
priorities are set to 1 (High). PM3 manages the server power and priorities directly. Since PM3 controls compatible server power
allocations, CMC no longer controls the Maximum Power Conservation Mode. Hence, this selection is disabled.
Managing and Monitoring Power
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