172 Brocade MLXe Series Hardware Installation Guide
53-1003030-01
Managing the cooling system
5
Displaying temperature warnings
If the temperature of a module exceeds the high temperature threshold for any of the fan speeds,
the system sends a warning message to the system log and an SNMP trap. (For more information
about the low and high temperature thresholds, refer to “Changing temperature thresholds for
modules and fan speeds” on page 164.) This section describes how to view the system log. If you
have configured your router to use a Syslog server or SNMP trap receiver, refer to the
documentation for the server or receiver.
To display the system log, enter the show log command at any CLI level.
Brocade# show log
Syntax: show log
Temperature log reduction
Depending on settings and temperature readings, fan speeds are changed dynamically within the
following ranges: low, med, med-hi, and high. Fan speed changes are determined by temperature
thresholds set for sensors on the management modules, interface modules and switch fabric
modules. When a temperature threshold is passed upward on any module, the fan speed changes
to the assigned fan speed. This occurs even if the temperature is within the threshold for the slower
fan speed on other modules. In previous versions of the software, a log message is sent whenever
a temperature threshold is crossed on any module whether the fan speed is actually increased or
not. This can result in excessive log messages.
The default behavior is a for log message to be sent only when the fan speed is actually changed,
which reduces the number of messages. A CLI option allows you to log all messages or have a
single log message sent when any temperature threshold is crossed.
Details about how to set temperature thresholds and default threshold values are described in the
“Configuring the cooling system” on page 163
Configuring temperature logging
The temp log-threshold command sets the temperature logging threshold to send a single message
whenever any of the thresholds are crossed.
Brocade(config) temp-log-threshold low
Syntax: temp-log-threshold [verbose | high | low | med | med-high]
TABLE 37 Fan status and speed fields
Field Description
Status The status can be one of the following:
• OK – The fan is functioning properly and is keeping the temperature of each module within
an acceptable temperature range.
• Failed – The fan is not functioning properly or the fan control module cannot control the fan.
Speed The speed can be one of the following:
• LOW – The fan is functioning at 50 percent of capacity.
• MEDIUM – The fan is functioning at 75 percent of capacity.
• MEDIUM-HIGH – The fan is functioning at 90 percent of capacity.
• HIGH – The fan is functioning at 100 percent of capacity.
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