User's Manual

Power Management 261
Table 8-3 describes the firmware response to a PSU power down or removal as
it applies to various PSU redundancy configurations.
PSU Removals With Degraded or No Redundancy Policy
The CMC may begin conserving power when you remove a PSU or a PSU
AC cord. The 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, the 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 blade servers.
Table 8-3. Chassis Impact from PSU Failure or Removal
PSU Configuration Dynamic PSU
Engagement
Firmware Response
AC Redundancy Disabled CMC alerts you of loss of AC Redundancy.
Power Supply
Redundancy
Disabled CMC alerts you of loss of Power Supply
Redundancy.
No Redundancy Disabled Decrease power to low priority servers,
if needed.
AC Redundancy Enabled CMC alerts you 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 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.