User's Manual

Power Management 231
PSU Removals With a No Redundancy Policy
The CMC may begin conserving power when a user removes 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 a user
removes more than one PSU, the CMC evaluates power needs again when the
second PSU is removed to determine the firmware response.
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. The M1000e chassis ships with one of two configurations:
three PSUs or six PSUs. You can select any of the three PSU redundancy
configuration settings listed in "Redundancy Policies" on page 225.
However, some redundancy policies, such as AC Redundancy, are not
available for chassis with fewer than six PSUs (the maximum number
allowable per chassis).
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 8-4 below lists the SEL entries that are related to power supply changes.
No Redundancy Enabled Decrease power to low priority servers, if
needed.
Table 8-3. Chassis Impact from PSU Failure or Removal (continued)
PSU Configuration Dynamic PSU
Engagement
Firmware Response