Maintaining The Fan Tray In Ex9200 Switches - Juniper EX9214 Hardware Manual

Maintaining the Fan Tray in EX9200 Switches

IN THIS SECTION
Purpose | 209
Action | 209
Purpose
For optimum cooling, verify the condition of the fans.
Action
• Monitor the status of the fans. A fan tray contains multiple fans that work in unison to cool the
switch components. If one fan fails, the host subsystem adjusts the speed of the remaining fans to
maintain proper cooling. A major alarm is triggered when a fan fails and a minor alarm and a major
alarm are 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@switch> show chassis environment
Class Item
Temp PEM 0
PEM 1
PEM 2
PEM 3
Routing Engine 0
Routing Engine 0 CPU
Routing Engine 1
Routing Engine 1 CPU
CB 0 Intake
CB 0 Exhaust A
CB 0 Exhaust B
CB 0 ACBC
CB 0 XF A
CB 0 XF B
CB 1 Intake
Status Measurement
OK 30 degrees C / 86 degrees F
OK 35 degrees C / 95 degrees F
Check
Absent
OK 31 degrees C / 87 degrees F
OK 30 degrees C / 86 degrees F
OK 33 degrees C / 91 degrees F
OK 31 degrees C / 87 degrees F
OK 30 degrees C / 86 degrees F
OK 29 degrees C / 84 degrees F
OK 36 degrees C / 96 degrees F
OK 34 degrees C / 93 degrees F
OK 50 degrees C / 122 degrees F
OK 46 degrees C / 114 degrees F
OK 30 degrees C / 86 degrees F
209