User's Manual

306 Power Management
PSU Removals With Degraded or No Redundancy Policy
CMC may begin conserving power when you remove a PSU or a PSU
AC cord. CMC decreases power to the lower priority servers until power
allocation is supported by the remaining PSUs in the chassis. If you remove
more than one PSU, CMC evaluates power needs again when the second PSU
is removed to determine the firmware response. If power requirements are
still not met, CMC may power off the lower priority servers.
Limits
• CMC does not support automated power-down of a lower priority server to
allow power up of a higher priority server; however, you can perform user-
initiated power-downs.
• Changes to the PSU redundancy policy are limited by the number of PSUs
in the chassis. You can select any of the three PSU redundancy
configuration settings listed in "Redundancy Policies" on page 298.
Power Supply and Redundancy Policy Changes in System Event Log
Changes in the power supply state and power redundancy policy are recorded
as events. Events related to the power supply that record entries in the system
event log (SEL) are power supply insertion and removal, power supply input
insertion and removal, and power supply output assertion and de-assertion.
Table 9-4 lists the SEL entries that are related to power supply changes.
Power Supply
Redundancy
Enabled CMC alerts you of loss of Power Supply
Redundancy. PSUs in standby mode (if any) are
turned on to compensate for power budget lost
from PSU failure or removal.
No Redundancy Enabled Decrease power to low priority servers, if needed.
Table 9-3. Chassis Impact from PSU Failure or Removal (continued)
PSU
Configuration
Dynamic PSU
Engagement
Firmware Response