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Installing or Replacing Modules, Fan Trays, and Power Supplies
Note
The switch shuts down if a mix of Gen 1 (N77-C7706-FAN) and Gen 2 (N77-C7706-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.
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
Gen1 and Gen2 fans are present in the
fantray for 1 seconds
2017 Apr 3 17:25:37 SWITCH %PLATFORM-1-PFM_ALERT: System shutdown in 0 days 6 hours 0 mins
0 seconds due to fan policy __pfm_
fanpresent_mismatch for AllFans
2017 Apr 3 17:25:41 SWITCH %PLATFORM-0-FAN_MISMATCH_TIME: Mismatch of Fan modules. Both
Gen1 and Gen2 fans are present in the
fantray for 9 seconds
2017 Apr 3 17:25:51 SWITCH %PLATFORM-0-FAN_MISMATCH_TIME: Mismatch of Fan modules. Both
Gen1 and Gen2 fans are present in the
fantray for 19 seconds
2017 Apr 3 17:26:01 SWITCH %PLATFORM-0-FAN_MISMATCH_TIME: Mismatch of Fan modules. Both
Gen1 and Gen2 fans are present in the
fantray for 29 seconds
2017 Apr 3 17:26:11 SWITCH %PLATFORM-0-FAN_MISMATCH_TIME: Mismatch of Fan modules. Both
Gen1 and Gen2 fans are present in the
fantray for 39 seconds
2017 Apr 3 17:26:21 SWITCH %PLATFORM-0-FAN_MISMATCH_TIME: Mismatch of Fan modules. Both
Gen1 and Gen2 fans are present in the
fantray for 49 seconds
2017 Apr 3 17:26:31 SWITCH %PLATFORM-0-FAN_MISMATCH_TIME: Mismatch of Fan modules. Both
Gen1 and Gen2 fans are present in the
fantray for 59 seconds
2017 Apr 3 17:26:37 SWITCH %PLATFORM-1-PFM_ALERT: System shutdown in 0 days 5 hours 59 mins
0 seconds due to fan policy __pfm
_fanpresent_mismatch for AllFans
2017 Apr 3 17:26:41 SWITCH %PLATFORM-0-FAN_MISMATCH_TIME: Mismatch of Fan modules. Both
Gen1 and Gen2 fans are present in the
OL-31330-01
Migrating from Gen 1 Fan Trays (N77-C7706-FAN) to Gen 2 Fan Trays (N77-C7706-FAN-2)
Cisco Nexus 7706 Hardware Installation Guide
97
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