User's Manual

Troubleshooting and Recovery 309
• 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 will 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 will allow for additional power allocation to the fans
without an impact on server performance.
Viewing Chassis Summaries
The CMC provides rollup overviews of the chassis, primary and standby
CMCs, iKVM, fans, temperature sensors, and I/O modules (IOMs).
Using the Web Interface
To view summaries of the chassis, CMCs, iKVM, and IOMs:
1
Log in to the CMC Web interface.
2 Select Chassis in the system tree.