Owner's Manual

428 Troubleshooting and Recovery
• 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
AC 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
AC Redundancy policy requires that the left three power
supplies to be connected to one AC Grid, and right three power
supplies to be connected to other AC Grid. If two PSU are improperly
connected, such as PSU3 and PSU4 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: 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.