Maintaining The T640 Fan Trays - Juniper T640 Hardware Manual

Maintaining the T640 Fan Trays

Purpose
Action
Copyright © 2013, Juniper Networks, Inc.
For optimum cooling, verify the condition of the fans.
On a regular basis:
Monitor the status of the fans. The fan trays each contain multiple fans that work in
unison to cool the router 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 is triggered when a fan tray is removed.
To display the status of the fans, issue the
show chassis fan command.
During normal operation, the fans in each fan tray function at less than full speed.
For the standard front fan trays and standard rear fan tray with eight fans, the output
for the
show chassis environment
user@host> show chassis environment
Class Item
...
Fans Top Left Front fan
Top Left Middle fan
Top Left Rear fan
Top Right Front fan
Top Right Middle fan
Top Right Rear fan
Bottom Left Front fan
Bottom Left Middle fan
Bottom Left Rear fan
Bottom Right Front fan
Bottom Right Middle fan
Bottom Right Rear fan
Rear Tray Top fan
Rear Tray Second fan
Rear Tray Third fan
Rear Tray Fourth fan
Rear Tray Fifth fan
Rear Tray Sixth fan
Rear Tray Seventh fan
Rear Tray Bottom fan
Top Left and Top Right refer to fans in the upper front fan tray.
refer to fans in the lower front fan tray.
Right
For the quiet fan trays, the output for the
to the following:
user@host> show chassis environment
Class Item
Fans Top Left Front fan
Top Left Rear fan
Top Right Front fan
Top Right Rear fan
Bottom Left Front fan
Bottom Left Rear fan
Bottom Right Front fan
Bottom Right Rear fan
Chapter 15: Maintaining T640 Router Hardware Components
show chassis environment
command is similar to the following:
Status Measurement
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed...
refers to the fans in the rear fan tray.
Rear
show chassis environment
Status Measurement
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
command or
Bottom Left and Bottom
command is similar
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