Dell POWEREDGE M1000E User Manual
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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