Users Guide

Maximum Power Conservation Mode
This is enabled only when AC redundancy is selected. CMC performs maximum power conservation when:
• Maximum conservation mode is enabled
• An automated command line script, issued by a UPS device, enables maximum conservation mode.
In maximum power conservation mode, all servers start functioning at their minimum power levels, and all subsequent
server power allocation requests are denied. In this mode, the performance of powered on servers may be degraded.
Additional servers cannot be powered on, regardless of server priority.
The system is restored to full performance when the maximum conservation mode is cleared.
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-configured 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
insufficient after reducing power allocations of the lower priority servers, CMC lowers the performance of servers until
sufficient power is freed to power the new server.
CMC reduces server power allocation in two cases:
• Overall power consumption exceeds the configurable System Input Power Cap .
• A power failure occurs in a non-redundant configuration.
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 off 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 configuring 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 12th generation servers
• Server priority of 12th generation servers
• System input power capacity
• Maximum power conservation mode
The CMC continues to maintain or manage:
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