When a fan fails or when you remove a fan tray, the remaining operating fans speed up to compensate for the
loss of fans. This process can increase the noise that is made by the fan trays until you replace the missing
fan tray or replace the defective fan tray.
Note
When replacing a failed fan tray in a running system, be sure to replace the fan tray promptly.
Note
If one or more fans fail within a fan tray, the Fan Status LED turns red. A fan failure could lead to temperature
alarms if not corrected immediately.
Tip
The software is continuously monitoring the fan status. In a fan failure, the following actions occur:
• System messages are displayed.
• Call Home alerts are sent (if configured).
• SNMP notifications are sent (if configured).
To display the fan module statuses, see
Displaying the Status for the Fan Trays, on page 59
.
The fan trays fill slots FAN 1, FAN 2, and FAN 3 in the chassis.
Note
Displaying the Status for the Fan Trays
You can display the status of the fan trays by using the
show environment fan
command.
If the status is not reported for a fan tray and the status LED is not lit for that installed fan tray, check to be
sure that there is a fabric module that is installed behind the fan tray. There must be a functioning fabric
module installed behind that fan tray in order for the fan tray to be powered up.
Note
Cisco Nexus 9516 NX-OS Mode Switch Hardware Installation Guide
59
Managing the Switch
Displaying the Status for the Fan Trays