User's Manual
308 Troubleshooting and Recovery
•
Problem:
The PSU state is displayed as
Failed (No AC),
even when an AC
cord is connected and the power distribution unit is producing good AC
output.
–
Resolution:
Check and replace the AC cord. Check and confirm that
the power distribution unit providing power to the power supply is
operating as expected. If the failure still persists, call Dell customer
service for replacement of the power supply.
•
Problem:
Dynamic Power Supply Engagement is enabled, but none of the
power supplies display in the
Standby
state.
–
Resolution:
This will occur if there is a six power supply configuration
for
AC Redundancy
, and enclosure operation requires power capacity
of at least three power supplies. Only when the surplus power available
in the enclosure exceeds the capacity of at least one power supply that
a pair of power supplies, one power supply from each of the
Online
and
Redundant
power supply sets, is moved to the
Standby
state.
•
Problem:
Inserted a new server into the enclosure with six power supplies,
but the server won't power on.
–
Resolution A:
Check the system input power cap setting - it might be
configured too low to allow any additional servers to be powered up.
–
Resolution B:
Check the server slot power priority of the slot
associated with the newly inserted server, and ensure it is not lower
than any other server slot power priority.
•
Problem:
Available power keeps changing, even when the modular
enclosure configuration hasn't changed
–
Resolution:
CMC 1.2 and higher versions have dynamic fan power
management that reduces server allocations briefly if the enclosure is
operating near the peak user configured power cap; it causes the fans
to be allocated power by reducing server performance to keep the
input power draw below
System Input Power Cap
. This is normal
behavior.
•
Problem:
2000 W is reported as the
Surplus for Peak Performance
.
–
Resolution:
The enclosure has 2000 W of surplus power available in
the current configuration, and the
System Input Power Cap
can be
safely reduced by this amount being reported without impacting
server performance.