User's Manual

Power Management 297
No Redundancy
Power from up to three PSUs is used to power the entire chassis. So in
a 6-PSU chassis, a chassis continues to operate at full capacity if
any 3 PSUs fail.
CAUTION: The No Redundancy mode uses only a minimum number of PSUs
without a backup. Failure of one of the active PSUs could cause servers to lose
power and data.
Power Conservation and Power Budget Changes
The CMC performs power conservation when the user-configured maximum
power limit is reached. When the demand for power exceeds the user
configured System Input Power Cap, the 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 configured with the same priority
level, the 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 of the servers in the chassis by giving
each server a number from 1 through 9. The default priority level for all servers is 1.
The lower the number, the higher the priority level.
For instructions on assigning server priority levels, see "Using RACADM" on
page 318.
You can assign server priority using the GUI:
1
Click Servers in the system tree 
2 Click Power  Priority .
Power Conservation and Max Conservation Mode
The CMC performs maximum power conservation when:
• The user selects maximum conservation mode using the Web interface or
RACADM.
• An automated command line script, issued by a UPS device, selects
maximum conservation mode.