User's Manual

Power Management 221
• If enough power is freed by reducing power to the existing servers, the
freed power is allocated to the new server and the server is allowed to
power up.
Table 8-2 describes the actions taken by the CMC when a new server is
powered on in the scenario described above.
Table 8-3 describes the firmware response to a PSU power down or removal as
it applies to various PSU redundancy configurations.
Table 8-2. CMC Response When a Server Power-On is Attempted
Worst Case Power
is Available
CMC Response Server
Power On
Yes No power conservation is required Allowed
No Perform power conservation:
• Power required for new server is available Allowed
• Power required for new server is not available Disallowed
Table 8-3. Chassis Impact from PSU Failure or Removal
PSU Configuration Dynamic PSU
Engagement
Firmware Response
AC Redundancy Disabled User alerted of loss of AC Redundancy.
Power Supply
Redundancy
Disabled User alerted of loss of Power Supply
Redundancy.
No Redundancy Disabled Decrease power to low priority servers, if
needed.
AC Redundancy Enabled User alerted of loss of AC Redundancy. PSUs
in standby mode (if any) are turned on to
compensate for power budget lost from the
PSU failure or removal.
Power Supply
Redundancy
Enabled User alerted 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.