User's Manual

Carrier Grade Chassis Management Controller User’s Guide Addendum 21
Table 1-2 describes the actions taken by CMC when a new server is powered
on in the scenario described earlier.
If a PSU fails, it results in a non-critical health state and a PSU failure event is
generated. The removal of a PSU results in a PSU removal event.
If either event results in a loss of redundancy, based on power allocations, a
loss of redundancy event is generated.
If the subsequent power capacity or the user power capacity is greater than
the server allocations, servers have degraded performance or, in a worse case,
servers may be powered down. Both conditions are in reverse-priority order,
that is, the lower priority servers are powered down first.
Table 1-3 describes the firmware response to a PSU power down or removal as
it applies to various PSU redundancy configurations.
Table 1-2. 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
• Power required for new server is
not available
Allowed
Not Allowed
Table 1-3. Chassis Impact from PSU Failure or Removal
PSU Configuration Dynamic PSU Engagement Firmware Response
Grid Redundancy Disabled CMC alerts you of loss of
Grid Redundancy.
Power Supply
Redundancy
Disabled Decrease power to low
priority servers, as
required.