The fan tray contains multiple fans that work in unison to cool the Services Gateway components. If one fan fails, the host subsystem adjusts the speed of the remaining fans to maintain proper cooling. A red alarm is triggered when a fan fails, and a yellow alarm and red alarm is triggered when a fan tray is removed.
To display the status of the cooling system, issue the show chassis environment command. The output is similar to the following:
user@host> show chassis environment
Class Item Status Measurement Temp PEM 0 OK PEM 1 OK Routing Engine 0 OK Routing Engine 1 Absent CB 0 Intake OK 36 degrees C / 96 degrees F CB 0 Exhaust A OK 43 degrees C / 109 degrees F CB 0 Mezz OK 45 degrees C / 113 degrees F CB 1 Intake Absent CB 1 Exhaust A Absent CB 1 Mezz Absent FPC 0 Intake OK 35 degrees C / 95 degrees F FPC 0 Exhaust A OK 35 degrees C / 95 degrees F FPC 0 Exhaust B OK 36 degrees C / 96 degrees F FPC 0 SF OK 50 degrees C / 122 degrees F FPC 1 Intake OK 34 degrees C / 93 degrees F FPC 1 Exhaust A OK 41 degrees C / 105 degrees F FPC 1 XLR OK 53 degrees C / 127 degrees F FPC 2 Intake OK 34 degrees C / 93 degrees F FPC 2 Exhaust A OK 44 degrees C / 111 degrees F FPC 4 Intake OK 40 degrees C / 104 degrees F FPC 4 Exhaust A OK 45 degrees C / 113 degrees F FPC 6 Intake OK 38 degrees C / 100 degrees F FPC 6 Exhaust A OK 44 degrees C / 111 degrees F Fans Fan 1 OK Spinning at intermediate-speed Fan 2 OK Spinning at intermediate-speed Fan 3 OK Spinning at intermediate-speed Fan 4 OK Spinning at intermediate-speed