I encountered a problem where Nexus 5548UP is throwing the FAN_DIR_MISMATCH error on bootup and shuts itself down. The FANs are powersupplies are all matching direction. After 3-4 manual poweroffs the switch will come up properly. Below is the error and show outputs.
One suspicion I have is the fex connected to this device which uses FAN-B fans. Does Nexus 5k and its FEX have to match airflow ?
2010 Aug 31 17:06:12 %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 55 seconds due to fan dir mismatch
2010 Aug 31 17:06:17 %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 50 seconds due to fan dir mismatch
2010 Aug 31 17:06:22 %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 45 seconds due to fan dir mismatch
2010 Aug 31 17:06:27 %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 40 seconds due to fan dir mismatch
2010 Aug 31 17:06:32 %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 35 seconds due to fan dir mismatch
2010 Aug 31 17:06:37 %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 30 seconds due to fan dir mismatch
2010 Aug 31 17:06:42 %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 25 seconds due to fan dir mismatch
2010 Aug 31 17:06:47 %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 20 seconds due to fan dir mismatch
5k2# show module
Mod Ports Module-Type Model Status
--- ----- -------------------------------- ---------------------- ------------
1 32 O2 32X10GE/Modular Universal Pla N5K-C5548UP-SUP active *
3 0 O2 Daughter Card with L3 ASIC N55-D160L3 ok
Mod Sw Hw World-Wide-Name(s) (WWN)
--- -------------- ------ --------------------------------------------------
1 5.1(3)N2(1c) 1.0 20:01:54:7f:ee:ab:2a:40 to 20:02:54:7f:ee:ab:2a:40
3 5.1(3)N2(1c) 1.0 --
Mod MAC-Address(es) Serial-Num
--- -------------------------------------- ----------
1 547f.eeab.2a48 to 547f.eeab.2a67 FOC16227GJK
3 0000.0000.0000 to 0000.0000.000f FOC16245CA6
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
5k2# show environment
Fan:
------------------------------------------------------
Fan Model Hw Status
------------------------------------------------------
Chassis-1 N5548P-FAN -- ok
Chassis-2 N5548P-FAN -- ok
PS-1 N55-PAC-750W -- ok
PS-2 N55-PAC-750W -- ok
Temperature
-----------------------------------------------------------------
Module Sensor MajorThresh MinorThres CurTemp Status
(Celsius) (Celsius) (Celsius)
-----------------------------------------------------------------
1 Outlet 67 58 29 ok
Power Supply:
Voltage: 12 Volts
-----------------------------------------------------------
PS Model Input Power Power Status
Type (Watts) (Amp)
-----------------------------------------------------------
1 N55-PAC-750W AC 780.00 65.00 ok
2 N55-PAC-750W AC 780.00 65.00 ok
Mod Model Power Power Power Power Status
Requested Requested Allocated Allocated
(Watts) (Amp) (Watts) (Amp)
--- ---------------------- ------- ---------- --------- ---------- --------
--
1 N5K-C5548UP-SUP 492.00 41.00 492.00 41.00 powered-
up
3 N55-D160L3 144.00 12.00 144.00 12.00 powered-
up
Power Usage Summary:
--------------------
Power Supply redundancy mode: Redundant
Power Supply redundancy operational mode: Redundant
Total Power Capacity 1560.00 W
Power reserved for Supervisor(s) 492.00 W
Power currently used by Modules 144.00 W
-------------
Total Power Available 924.00 W
-------------
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
5k2# show inventory
NAME: "Chassis", DESCR: "Nexus5548 Chassis"
PID: N5K-C5548UP , VID: V01 , SN: SSI16120DP4
NAME: "Module 1", DESCR: "O2 32X10GE/Modular Universal Platform Supervisor"
PID: N5K-C5548UP , VID: V01 , SN: FOC16227GJK
NAME: "Fan 1", DESCR: "Chassis fan module"
PID: N5548P-FAN , VID: N/A , SN: N/A
NAME: "Fan 2", DESCR: "Chassis fan module"
PID: N5548P-FAN , VID: N/A , SN: N/A
NAME: "Power supply 1", DESCR: "AC power supply"
PID: N55-PAC-750W , VID: V02 , SN: POG16087T9R
NAME: "Power supply 2", DESCR: "AC power supply"
PID: N55-PAC-750W , VID: V02 , SN: POG16067T0T
NAME: "Module 3", DESCR: "O2 Daughter Card with L3 ASIC"
PID: N55-D160L3 , VID: V01 , SN: FOC16245CA6
