Users Guide
CMC reduces server power allocation in two cases:
• Overall power consumption exceeds the congurable System Input Power Cap.
• A power failure occurs in a non-redundant conguration.
110V PSUs AC Operation
Some PSUs support operation with 110V AC input. This input can exceed the allowed limit for the branch circuit. If any PSUs are connected
to 110V AC, the user needs to set CMC for normal operation of the enclosure. If it is not set and 110V PSUs are detected, all subsequent
server power allocation requests are denied. In this case, additional servers cannot be powered on, regardless of their priority. You can set
CMC to use 110 V PSUs using the Web interface or RACADM.
Power supply entries are logged to the SEL log:
• When 110V power supplies are detected or removed.
• When the 110V AC input operation is enabled or disabled.
The overall power health is at least in Non-Critical state when the chassis is operating in 110V mode and the user has not enabled the 110V
operation. The "Warning" icon is displayed on the Web interface main page when in Non-Critical state.
Mixed 110V and 220V operation is not supported. If CMC detects that both voltages are in use, then one voltage is selected and those
power supplies connected to the other voltage are powered o and marked as failed.
Server Performance Over Power Redundancy
When enabled, this option favors server performance and server powerup, over maintaining power redundancy. When disabled, the system
favors power redundancy over server performance. When disabled, then if the power 298 Managing and Monitoring Power supplies in the
chassis do not provide sucient power, both for redundancy, as well as full performance, then to preserve redundancy, some servers may
not be:
• Granted sucient power for full performance
• Powered on
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 on enabling this feature and conguring the collection and
logging interval, see the Executing Power Control Operations section.
External Power Management
CMC Power management is optionally controlled by the Dell OpenManage Power Center. For more information, see the Dell
OpenManage Power Center User’s Guide.
When external power management is enabled, Dell OpenManage Power Center manages:
• Server Power of supported M1000e servers
• Server Priority of supported M1000e servers
• System Input Power Capacity
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Managing and Monitoring Power