Brocade FastIron SX Series Chassis Hardware Installation Guide - Manual (Page 99)

Managing the cooling system
This section provides configuration, management, and monitoring information for the cooling system in
FastIron X Series chassis devices.
Configuring the cooling system
Since FastIron X Series chassis devices provide default settings for all cooling system parameters, no
initial configuration of the cooling system is necessary. You can change the settings of the following
cooling system parameters:
• Low and high temperature thresholds for modules and fan speeds
• Interval at which the system polls the temperature sensors on the module for a reading
• Temperature at which the device will shut down
• Fan speed
Thermal planes
The FSX 800 and FSX 1600 have three thermal planes:
• Thermal Plane 1 (also called Rule 1/3) - This thermal plane includes the temperature sensors on
the management module or modules only. Each management module has two temperature
sensors.
• Thermal Plane 2 (also called Rule 2/3) - This thermal plane includes all of the temperature sensors
on all of the interface modules. Each interface module has one temperature sensor.
• Thermal Plane 3 (also called Rule 3/3) - This thermal plane includes all of the temperature sensors
on the switch fabric modules. Each switch fabric module has one temperature sensor.
All thermal planes, along with temperature thresholds, help determine at which speed the fans should
operate. For each thermal plane, you can define separate temperature thresholds for fan speeds. Each
thermal plane can have different temperature thresholds.
For each thermal plane, the Brocade device records the highest temperature based on the temperature
reading of all of the modules in the thermal plane. The system uses this information and the current
configured temperature thresholds to adjust the fan speed. You can view the temperature of each
thermal plane using the show chassis command.
Fan speed modes
The fans can operate in automatic or manual mode. The default is automatic mode. This section
describes both methods.
Automatic mode
By default, the fans operate in automatic mode, self-adjusting their speed based on both of the following
factors:
• The current temperature of each thermal plane
• The current configured temperature threshold ranges for all fan speeds
The Brocade device has default temperature threshold ranges for fan speeds ( Changing temperature
thresholds for thermal planes and fan speeds on page 98). If desired, you can change these settings.
Managing the cooling system
Brocade FastIron SX Series Chassis Hardware Installation Guide 97
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