84 Brocade BigIron RX Series Hardware Installation Guide
53-1002483-03
Managing the cooling system
4
•If the temperature of a management module, the switch fabric module, and all interface
modules falls below the low threshold for a fan speed, the fan decreases its speed to the next
lower speed. If the temperature of all modules falls below the high threshold for the low speed,
the fan operates at the low speed.
If the temperature of a management module or the switch fabric module or an interface modules
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 information about viewing the warning
messages, refer to “Displaying temperature warnings” on page88.
Table 1 9 outlines the default low and high temperature thresholds for each module and fan speed.
For information about checking the current settings of the low and high temperature thresholds for
modules and fan speeds, refer to “Displaying temperature thresholds for modules and fan speeds”
on page 85.
If desired, you can change the default low and high temperature thresholds for a particular module
and fan speed. For example, to change the low and high thresholds of the medium fan speed for
the management modules to 56 C and 72 C, respectively, enter the following command at the
global CONFIG level of the CLI:
BigIron RX(config)# fan-threshold mp med 56 72
TABLE 1 9 Default low and high temperature thresholds for modules and fan speeds
Fan speed Low temperature threshold High temperature threshold
Management module (active and standby)
High 77 C85 C
Medium-high 67C80 C
Medium 57 C70C
Low –1 C60 C
Management module CPU (on active and standby modules)
High 72 C85 C
Medium-high 67 C80 C
Medium 57C70C
Low –1C60 C
Interface modules
High 56C95 C
Medium-high 51 C60C
Medium 46 C55C
Low –1C50C
Switch fabric module
High 77C85C
Medium-high 67C80 C
Medium 57 C70 C
Low –1 C60C