Nexus 5548UP FAN_DIR_MISMATCH

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Mar 11th, 2014
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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

 

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ygazel Tue, 03/11/2014 - 18:13
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This one is interesting, however you can have the FEX with one Fan direction and the N5K with another direction, other than reseatting the PS and the FAN there should not be any issue with the parts you have now

ataranen Sat, 03/15/2014 - 05:28
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I'm still staggling with this issue. I moved fans and power supplies around. I tried running only with 1 fan and 1 PS, still this problem comes up intermittently. Do you think it could be a software issue? Can wiping out the bootflash and reinstalling help? 

Javier Amores Thu, 05/29/2014 - 03:17
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Hi,

We had the same problem with a Nexus 5596 in 5.1(3)N2(1a) last night:

%NOHMS-2-NOHMS_ENV_ERR_FAN_SPEED: System minor alarm in fan tray 1: fan speed is out of range on fan 2. 5812 to 12500 rpm expected. 4072 rpm read
%NOHMS-2-NOHMS_ENV_ERR_FAN_DOWN: System minor alarm on fans: One fan missing or failed
%NOHMS-2-NOHMS_ENV_ERR_FAN_RECOVERED: Recovered: System minor alarm in fan tray 1
%NOHMS-2-NOHMS_ENV_ERR_ALL_FAN_UP: Recovered: System minor alarm on fans: One fan missing or failed
%PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 60 seconds due to fan dir mismatch
%NOHMS-2-NOHMS_ENV_ERR_FAN_DIR: System major alarm: fan direction mismatch with other fan(s)
%PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 55 seconds due to fan dir mismatch
%PFMA-0-SYS_SHUTDOWN_FAN_DIR_MISMATCH: System shutdown in 50 seconds due to fan dir mismatch

After reseating the FANs the switch came up. We'll open a TAC case.

 

Javier

ygazel Mon, 03/17/2014 - 08:42
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At this point I will suggest opening a TAC case since this may be related to HW itself and not something on the configuration.

 

HTH

 

Yamil

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