Maintaining The M320 Fan Trays; Maintaining The M320 Host Subsystem - Juniper M320 Hardware Manual

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Maintaining the M320 Fan Trays

Purpose
Action
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Maintaining the M320 Host Subsystem

Purpose
Copyright © 2010, Juniper Networks, Inc.
M320 Cooling System Description on page 37
Troubleshooting the M320 Cooling System on page 129
Replacing the M320 Cooling System Components
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
output is similar to the following:
user@host> show chassis environment
Class Item
...
Fan Top Left Front fan
Top Right Rear fan
Top Right Front fan
Top Left Rear fan
Bottom Left Front fan
Bottom Right Rear fan
Bottom Right Front fan
Bottom Left Rear fan
Rear Fan 1 (TOP)
Rear Fan 2
Rear Fan 3
Rear Fan 4
Rear Fan 5
Rear Fan 6
Rear Fan 7 (Bottom)
...
M320 Cooling System Description on page 37
Troubleshooting the M320 Cooling System on page 129
Replacing the M320 Cooling System Components
For optimum router performance, verify the condition of the host subsystem. The host
subsystem comprises a Routing Engine and up to two adjacent CBs functioning together.
Chapter 11: Maintaining M320 Router Hardware Components
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
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. The
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