Users Guide

• System Input Power Cap
• Redundancy Policy
• Extended Power Performance
• Server Performance Over Power Redundancy
• Dynamic Power Supply Engagement
• Disable Chassis Power Button
• Allow 110 VAC Operation
• Max Power Conservation Mode
• Remote Power Logging
• Remote Power Logging Interval
• Server Based Power Management
• Disable AC Power Recovery
Related concepts
Power Conservation and Power Budget
Maximum Power Conservation Mode
Server Power Reduction to Maintain Power Budget
110V PSUs AC Operation
Server Performance Over Power Redundancy
Remote Logging
External Power Management
Related tasks
Configuring Power Budget and Redundancy Using CMC Web Interface
Configuring Power Budget and Redundancy Using RACADM
Power Conservation and Power Budget
CMC conserves power when the user-configured maximum power limit is reached. When the demand for power exceeds the user
configured System Input Power Cap, CMC reduces power to servers in reverse-priority order. This allows power for higher priority servers
and other modules in the chassis.
If all or multiple slots in the chassis are configured with the same priority level, CMC decreases power to servers in increasing slot number
order. For example, if the servers in slots 1 and 2 have the same priority level, the power for the server in slot 1 is decreased before that of
the server in slot 2.
NOTE:
You can assign a priority level to each server in the chassis assigning a number from 1 through 9 for each server.
The default priority level for all servers is 1. The lower the number, the higher the priority level.
The power budget is limited to a maximum value equal to that of the set of three PSUs that is the weakest. If you attempt to set an AC
power budget value that exceeds the System Input Power Cap value, CMC displays a failure message. The power budget is limited to
16685 Watts.
Maximum Power Conservation Mode
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.
NOTE:
If the Maximum Power Conversation Mode (MPCM) is enabled on the chassis, all power requests from a blade
server are denied. The blade server is not powered on if there is any action in the iDRAC or blade server requiring the
host to start the power cycle.
Managing and Monitoring Power 203