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When a temperature threshold is crossed (either below or above the pre-configured value), the system logs
an event that contains information about the time when the event occurred, the type of event (minor, major,
or shutdown), the current temperature of the sensor, and the identity of the sensor. The system also logs
events when the fan speeds change (increase or decrease) as a result of changes in sensor temperature. To
display the event log, use the show logging command.
The following examples display over-temperature event messages. Note that although the minimum speed
for system fans is 40% of full speed, the corresponding power-supply fan speed is 60% of full speed.
00:21:47: %SYSTEM:LP %CHMGR-2-FAN_SPEED_CHANGE: Fan speed changed to 40 % of the
full speed
00:21:47: %SYSTEM:LP %CHMGR-2-PSU_FAN_SPEED_CHANGE: PSU_Fan speed changed to 60 %
of the full speed
00:27:35: %SYSTEM:LP %POLLMGR-2-SENSOR_TEMP_CHANGE: Switching Core Sensor S2,
temperature 52C, changed to Major state
When the system experiences a high temperature on any temperature sensor that exceeds the Critical
threshold, a shutdown log event is generated; for example:
Dell#Jun 18 01:57:03: %RPM1-P:CP %CHMGR-2-TEMP_SHUTDOWN_WARN: WARNING! linecard 11
temperature is 110C; approaching shutdown threshold of 110C)
Dell#Jun 18 01:57:04: %RPM1-P:CP %CHMGR-0-TEMP_SHUTDOWN_WARN:
temperature exceeded or equal to shutdown temperature 110C; Unit will shutdown
now.Power cycle the unit to power it on.
The identity of the sensor which caused the shutdown can be determined by displaying the system log for
temperature-crossing events (show environment thermal-sensors command).
00:16:08: %SYSTEM:LP %CHMGR-0-TEMP_SHUTDOWN_WARN:
exceeded its critical shutdown temperature; Unit will shutdown now. Power cycle
the unit to power it on.
After the system shuts down, it is not possible to operate the console until you reload (power cycle) the
system.
NOTE:
The systems fan trays and power supplies always blow air from the front (I/O side) to the back
(Utility/power supply and fan side) of the switch. Ensure the air ducts are clean and that all fans (system
fans and power-supply fans) are working correctly. Ensure that there are fan alarms, including fan-tray
and power-supply fan alarms. Use the show alarms command to display alarm information and the
show environment command to display the current operational status of power supplies and fan-tray
components.
Troubleshooting Packet Loss
Use show hardware linecard commands to troubleshoot packet loss.
•
show hardware linecard cpu data-plane statistics
•
show hardware party-bus port {{0-7} | all} statistics
•
show hardware linecard {0-2} drops unit {0-3} port {1-104}
•
show hardware linecard {0-2} unit {0-3} {counters | details | port-stats
[detail] | register | execute-shell-cmd | ipmc-replication | table-dump}
•
show hardware {layer2| layer3} {e.g. acl |in acl} linecard {0-2} port—set {0-3}
linecard 11
Unit 0 a temperature sensor has
Debugging and Diagnostics
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Table of Contents
Troubleshooting
