User's Manual

Power Management 301
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 servers.
Limits
• The 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 296.
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.
Table 9-3. Chassis Impact from PSU Failure or Removal
(continued)
PSU Configuration Dynamic PSU
Engagement
Firmware Response