Users Guide

Conguring power budget and redundancy
You can congure the power budget, redundancy, and dynamic power of the entire chassis (chassis, servers, I/O module, KVM, CMC, and
power supplies), which uses four power supply units (PSUs). The power management service optimizes power consumption and
reallocates power to dierent modules based on the requirement.
You can congure the following:
• System Input Power Cap
• Redundancy Policy
• Enable Dynamic Power Supply Engagement
• Disable Chassis Power Button
• Max Power Conservation Mode
• Remote Power Logging
• Remote Power Logging Interval
• Server Based Power Management
• Disable AC Power Recovery
Power Conservation and Power Budget
CMC conserves power when the user-congured maximum power limit is reached. When the demand for power exceeds the user
congured System Input Power Cap, CMC reduces power to servers in reverse-priority order to free power for higher priority servers and
other modules in the chassis.
If all or multiple slots in the chassis are congured with the same priority level, CMC decreases power to servers in the order of increasing
slot number. 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 of whichever set of two 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 message. The power budget is limited to 4800W.
Maximum Power Conservation Mode
This is enabled for Grid Redundancy or PSU Redundancy modes. 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.
184 Managing and Monitoring Power