Brocade MLX Series and Brocade NetIron XMR Hardware ...

Managing the cooling system 7Displaying fan tray status and speedTo display the status and speed of the 4-speed fans in the router, enter the show chassis commandat any level of the CLI.Brocade# show chassis...--- FANS ---Back fan tray 1: Status = OK, Speed = LOW (50%)Back fan tray 2: Status = OK, Speed = LOW (50%)Back fan tray 3: Status = OK, Speed = LOW (50%)Back fan tray 4: Status = OK, Speed = LOW (50%)Syntax: show chassisFor information about all output generated by the show chassis command, refer to “Displayingdevice status and temperature readings” on page 324.TABLE 51FieldFan status and speed fieldsDescriptionStatusSpeedThe status can be one of the following:• OK – The fan is functioning properly and is keeping the temperature of each module withinan acceptable temperature range.• Failed – The fan is not functioning properly or the fan control module cannot control the fan.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.Displaying temperature warningsIf 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 informationabout the low and high temperature thresholds, refer to “Changing temperature thresholds formodules and fan speeds” on page 331.) This section describes how to view the system log. If youhave configured your router to use a Syslog server or SNMP trap receiver, refer to thedocumentation for the server or receiver.To display the system log, enter the show log command at any CLI level.Brocade# show logSyntax: show logTemperature log reductionDepending on settings and temperature readings, fan speeds are changed dynamically within thefollowing ranges: low, med, med-hi, and high. Fan speed changes are determined by temperaturethresholds set for sensors on the management modules, interface modules and switch fabricmodules. When a temperature threshold is passed upward on any module, the fan speed changesto the assigned fan speed. This occurs even if the temperature is within the threshold for the slowerfan speed on other modules. In previous versions of the software, a log message is sent whenevera temperature threshold is crossed on any module whether the fan speed is actually increased ornot. This can result in excessive log messages.Brocade MLX Series and Brocade NetIron XMR Hardware Installation Guide 33753-1002373-02