Users Guide

– 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.
Troubleshooting Alerts
Use the CMC log and the trace log to troubleshoot CMC alerts. The success or failure of each email
and/or SNMP trap delivery attempt is logged into the CMC log. Additional information describing the
particular error is logged in the trace log. However, since SNMP does not confirm delivery of traps, use a
network analyzer or a tool such as Microsoft’s snmputil to trace the packets on the managed system.
Related Concepts
Configuring CMC To Send Alerts
Viewing Event Logs
You can view hardware and CMC logs for information on system-critical events that occur on the
managed system.
Related Concepts
Viewing Hardware Log
Viewing CMC Log and Enhanced Chassis Log
Viewing Hardware Log
CMC generates a hardware log of events that occur on the chassis. You can view the hardware log using
the Web interface and remote RACADM.
NOTE: To clear the hardware log, you must have Clear Logs Administrator privilege.
NOTE: You can configure CMC to send email or SNMP traps when specific events occur. For
information on configuring CMC to send alerts, see Configuring CMC to Send Alerts.
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