Users Guide

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 congured to No Redundancy. To avoid a future power

supply failure causing servers to power o, ensure that the chassis has at least four power supplies and is congured 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 congured 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

conrm delivery of traps, use a network analyzer or a tool such as Microsoft’s snmputil to trace the packets on the managed system.