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why does my qfx3500 fan fail every 1-2month ?

  • 1.  why does my qfx3500 fan fail every 1-2month ?

    Posted 24 days ago

    Hello,

    I have a 2x QFX3500 in virtual chassis mode and every 1-2 month one of my Fan trays showed as failed and everything is ok , Fan trays are spining at normal speed they have 1unit free space from up and bottom of the every switch, and here is the switch output :

    Class Item Status Measurement
    Power FPC 0 Power Supply 0 OK
    FPC 0 Power Supply 1 OK
    FPC 1 Power Supply 0 OK
    FPC 1 Power Supply 1 OK
    Temp FPC 0 Sensor TopLeft I OK 21 degrees C / 69 degrees F
    FPC 0 Sensor TopRight I OK 22 degrees C / 71 degrees F
    FPC 0 Sensor TopLeft E OK 35 degrees C / 95 degrees F
    FPC 0 Sensor TopRight E OK 33 degrees C / 91 degrees F
    FPC 0 Sensor TopMiddle I OK 31 degrees C / 87 degrees F
    FPC 0 Sensor TopMiddle E OK 31 degrees C / 87 degrees F
    FPC 0 Sensor Bottom I OK 37 degrees C / 98 degrees F
    FPC 0 Sensor Bottom E OK 30 degrees C / 86 degrees F
    FPC 0 Sensor Die Temp OK 42 degrees C / 107 degrees F
    FPC 0 Sensor Mgmnt Brd I OK 21 degrees C / 69 degrees F
    FPC 0 Sensor Switch I OK 31 degrees C / 87 degrees F
    FPC 1 Sensor TopLeft I OK 21 degrees C / 69 degrees F
    FPC 1 Sensor TopRight I OK 20 degrees C / 68 degrees F
    FPC 1 Sensor TopLeft E OK 27 degrees C / 80 degrees F
    FPC 1 Sensor TopRight E OK 27 degrees C / 80 degrees F
    FPC 1 Sensor TopMiddle I OK 27 degrees C / 80 degrees F
    FPC 1 Sensor TopMiddle E OK 34 degrees C / 93 degrees F
    FPC 1 Sensor Bottom I OK 33 degrees C / 91 degrees F
    FPC 1 Sensor Bottom E OK 33 degrees C / 91 degrees F
    FPC 1 Sensor Die Temp OK 41 degrees C / 105 degrees F
    FPC 1 Sensor Mgmnt Brd I OK 19 degrees C / 66 degrees F
    FPC 1 Sensor Switch I OK 27 degrees C / 80 degrees F
    Fans FPC 0 Fan Tray 0 OK Spinning at normal speed
    FPC 0 Fan Tray 1 OK Spinning at normal speed
    FPC 0 Fan Tray 2 Failed
    FPC 1 Fan Tray 0 OK Spinning at normal speed
    FPC 1 Fan Tray 1 OK Spinning at normal speed
    FPC 1 Fan Tray 2 OK Spinning at normal speed



    show chassis alarms
    1 alarms currently active
    Alarm time Class Description
    2020-11-06 04:44:17 UTC Major FPC 0 Fan 2 not spinning

     

     

     

    the strange part is Fan Tray 2 LED is ON and its not off and when i put a little tissue paper on fan tray 2 it seems the fan tray is working but i do not know why does in qfx it shows as failed,

    i have reboot whole of the switches but the issue still exists,

    here is picture of the switch : 



  • 2.  Re: why does my qfx3500 fan fail every 1-2month ?

     
    Posted 24 days ago

    Hi,

     

    if it is happening again and again you better get the FPC0 replaced.

     

    Regards,

     

    Amit Rai

     



  • 3.  Re: why does my qfx3500 fan fail every 1-2month ?

    Posted 24 days ago

    Hello,

    last month i replaced whole of the VC member with new qfx3500 but it seems its related something tot eh software.

    i have read in juniper kb that qfx5100 has same issue when the fan working outside of the range, and am i using  15.1R7.8 , is it possible this is relared to the software?

    because currently i put a smal tissue paper on Fan Tray 2 (mgmt board) it seems it was working fine