Managing The Cooling System; Configuring The Cooling System - Brocade Communications Systems MLX Series Installation Manual

Managing the cooling system

This section provides configuration, management, and monitoring information about router cooling
systems.

Configuring the cooling system

Your router is pre-configured with default settings for all cooling system parameters. Although no
initial configuration of the cooling system is necessary, you can change the settings of the following
cooling system parameters:
•
•
NOTE
Auto control of fan speed is not monitored when cards are in interactive mode. Set fan speed to high
to prevent over-temp condition.
NOTE
Adjusting fan controls out of the default setting can negatively affect the efficient cooling of blades
and may cause a blade to overheat and shutdown.
Changing temperature thresholds for modules and fan speeds
The cooling system includes fans that operate at four speeds: low, medium, medium-high, and
high. In general, each fan speed, (except for low), has a low and high temperature threshold
associated with it, as shown in
only.
NOTE
Adjusting fan controls out of the default setting can negatively affect the efficient cooling of blades
and may cause a blade to overheat and shutdown.
FIGURE 227
The low and high temperature thresholds allow the router to determine the speed at which the fans
should operate. In general, the fans operate according to these guidelines:
•
Brocade MLX Series and Brocade NetIron XMR Hardware Installation Guide
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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
Fan speeds and temperature thresholds
High, 60 deg.
Low Speed
Operating
50 55
Temperature
Low 57, deg.
If the temperature of all modules falls between the low and high thresholds for a fan speed, the
fan continues to operate at that speed.
Figure 227. The low fan speed has a high temperature threshold
Low, 67 deg.
Med-High
Speed
60 65 70 75
Medium
Speed
High, 70 deg. Low, 77 deg.
Managing the cooling system
High, 80 deg.
80 85 90
High
Speed
High, 85 deg.
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