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 three slots) and one power supply
in side 2 (the right three 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, ensure that a full PSU configuration of six power supplies
is available.)
Resolution B: Ensure that all power supplies are properly
connected to the two AC grids. Power supplies in side 1 need to be
connected to one AC grid, those in side 2 need to 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 cable is connected and the power
distribution unit is producing good AC output.
Resolution A: Check and replace the AC cable. 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: Installed a new server into the enclosure with
sufficient power supplies, but the server does not power on.
Resolution A: Ensure that the system input power cap setting
is not configured too low to allow any additional servers to be powered
up.
Resolution B: Check for 110V operation. If any power supplies
are connected to 110V branch circuits, you must acknowledge this as
a valid configuration before servers are allowed to power on. For
more details, see the power configuration settings.
Resolution C: Check the maximum power conservation setting.
If this is set then servers are allowed to power on. For more details,
see the power configuration settings.
Resolution D: Ensure that the server slot power priority
of the slot associated with the newly installed server, is not lower
than any other server slot power priority.
Problem: Available power keeps changing, even when the
modular enclosure configuration has not changed
Resolution: CMC 1.2 and later 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 drawn 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.
Problem: A subset of servers lost power after an AC Grid
failure, even when the chassis was operating in the Grid
Redundancy configuration with six 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 three power supplies are connected to one AC Grid, and
right three power supplies are connected to other AC Grid. If two
PSUs are improperly connected, such as PSU3 and PSU4 are connected
to the wrong AC grids, an AC grid failure causes loss of power to
the least priority servers.
Problem: The least priority servers lost power after a
PSU failure.
Resolution: This is expected behavior if the enclosure
power policy was configured to No Redundancy. To avoid a future power supply failure causing servers to power off,
ensure that the chassis has at least four 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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