The following information helps you to troubleshoot power supply
and power-related issues:
Problem: Configured the Power Redundancy Policy to Grid Redundancy, and a Power Supply Redundancy
Lost event was raised.
Resolution A: This configuration requires at least one
power supply in side 1 (the left two slots) and one power supply in
side 2 (the right two slots) to be present and functional in the modular
enclosure. Additionally the capacity of each side must be enough to
support the total power allocations for the chassis to maintain Grid redundancy. (For full Grid Redundancy operation,
make sure that a full PSU configuration of four power supplies is
available.)
Resolution B: Check if all power supplies are properly
connected to the two AC grids; power supplies in side 1 must be connected
to one AC grid, those in side 2 must be connected to the other AC
grid, and both AC grids must be working. Grid Redundancy is lost when one of the AC grids is not functioning.
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 A: 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.
Resolution B: Check that the PSU is connected to the same
voltage as the other PSUs. If CMC detects a PSU operating at a different
voltage, the PSU is turned off and marked Failed.
Problem: Dynamic Power Supply Engagement is enabled, but
none of the power supplies display in the Standby state.
Resolution A: There is insufficient surplus power. One
or more power supplies are moved into the Standby state only when
the surplus power available in the enclosure exceeds the capacity
of at least one power supply.
Resolution B: Dynamic Power Supply Engagement cannot be
fully supported with the power supply units present in the enclosure.
To check if this is the case, use the web interface to turn Dynamic
Power Supply Engagement off, and then on again. A message is displayed
if Dynamic Power Supply Engagement cannot be fully supported.
Problem: Inserted a new server into the enclosure with
sufficient power supplies, but the server does not power on.
Resolution A: Check for the system input power cap setting—it
might be configured too low to allow any additional servers to be
powered up.
Resolution B: Check for the maximum power conservation
setting. If this is set, then this issue occurs. For more details,
see the power configuration settings.
Resolution C: Check for the server slot power priority
of the slot associated with the newly-inserted server, and then ensure
it is not lesser than any other server slot power priority.
Problem: Available power keeps changing, even when the
modular enclosure configuration has not changed.
Resolution: CMC has 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: <number>W is reported as the Surplus
for Peak Performance.
Resolution: The enclosure has <number>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.
Problem: A subset of servers lost power after an AC Grid
failure, even when the chassis was operating in the Grid
Redundancy configuration with four power supplies.
Resolution: This can occur if the power supplies are improperly
connected to the redundant AC grids at the time the AC grid failure
occurs. The Grid Redundancy policy requires
that the left two power supplies be connected to one AC grid, and
right two power supplies be connected to other AC grid. If two PSUs
are improperly connected, such as PSU 2 and PSU 3 are connected to
the wrong AC grids, an AC grid failure cause loss of power to the
least priority servers.
Problem: The least priority servers lost power after a
PSU failure.
Resolution: To avoid a future power supply failure causing
servers to power off, make sure that the chassis has at least three
power supplies and is configured for the Power Supply Redundancy policy to prevent PSU failure from impacting server operation.
Problem: Overall server performance decreases when the
ambient temperature increases in the data center.
Resolution: This can occur if the System Input
Power Cap has been configured to a value that results
in an increased power need by fans having to be made up by reduction
in the power allocation to the servers. User can increase the System Input Power Cap to a higher value that allow for
additional power allocation to the fans without an impact on server
performance.
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