c) Press the bottom of the fan tray into the slot so that the electrical connectors at the bottom of the module
are inserted into the connectors inside the slot.
d) Press the whole fan tray into the slot so that the front of the fan tray is touching the outer surface of the
chassis and the four captive screws on the module are aligned to four screw holes in the chassis.
e) Screw in each of the four captive screws to secure the fan tray to the chassis and tighten them to 8 in-lb
(0.9 N·m) of torque.
Step 3
Verify that the fan tray is functioning by making sure that its Status LED is green.
For more information about the fan tray LEDs, see the
I/O Module LEDs, on page 194
topic.
Migrating from Gen 1 Fan Trays (N77-C7718-FAN) to Gen 2 Fan
Trays (N77-C7718-FAN-2)
Perform the steps given below to replace all the three Gen 1 fan trays in a switch with Gen 2 fan trays:
1
Put the switch in fan tray maintenance mode by using the
hardware fan-tray maintenance-mode
[
long
|
medium
|
short
] command.
2
Remove the left-most Gen 1 fan tray, FAN TRAY 1 (N77-C7718-FAN), from the switch.
3
Insert the Gen 2 fan tray (N77-C7718-FAN-2) into the empty fan tray slot.
The switch shuts down if a mix of Gen 1 (N77-C7718-FAN) and Gen 2 (N77-C7718-FAN-2) fan trays
are present in the same switch for more than 21600 seconds (6 hours). The syslog message
"PLATFORM-0-FAN_MISMATCH_TIME: Mismatch of Fan modules. Both Gen1 and Gen2 fans are
present in the fantray for <
number
> seconds" is displayed at regular intervals when both Gen 1 and Gen
2 fan trays are present in the same switch.
Note
4
Remove the Gen 1 fan tray from FAN TRAY 2.
5
Insert the Gen 2 fan tray into the empty fan tray slot.
6
Remove the Gen 1 fan tray from FAN TRAY 3.
7
Insert the Gen 2 fan tray into the empty fan tray slot.
The following example shows the syslogs that are generated when only one of the three installed Gen 2 fan
trays is replaced by a Gen 1 fan tray, resulting in a fan tray mismatch:
2017 Apr 3 17:25:19 SWITCH %PLATFORM-2-FAN_REMOVED: Fan module 3(Serial number NCV2108V01K)
Fan3(sys_fan3) removed
2017 Apr 3 17:25:19 SWITCH %PLATFORM-6-PFM_INFO: Fan Zone 1 : Fan Speed will change from
45.88(0x75) to 100.00(0xff)
2017 Apr 3 17:25:32 SWITCH %PLATFORM-5-FAN_DETECT: Fan module 3(Serial number DCH1910A06N)
Fan3(sys_fan3) detected
2017 Apr 3 17:25:32 SWITCH %PLATFORM-5-FAN_STATUS: Fan module 3(Serial number DCH1910A06N)
Fan3(sys_fan3) current-status is F
AN_OK
2017 Apr 3 17:25:32 SWITCH %PLATFORM-2-FANMOD_FAN_OK: Fan module 3(Fan3(sys_fan3) fan) ok
2017 Apr 3 17:25:32 SWITCH %PLATFORM-6-PFM_INFO: Fan Zone 1 : Fan Speed will change from
100.00(0xff) to 80.00(0xcc)
2017 Apr 3 17:25:32 SWITCH %PLATFORM-0-FAN_MISMATCH_TIME: Mismatch of Fan modules. Both
Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide
OL-30453-01
117
Installing or Replacing Modules, Fan Trays, and Power Supplies
Migrating from Gen 1 Fan Trays (N77-C7718-FAN) to Gen 2 Fan Trays (N77-C7718-FAN-2)