FLEX200 / recommended device temperature

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StefanZ
StefanZ Posts: 191  Master Member
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edited May 2023 in Security

Our FLEX200 reports back a constant, yet toasty 67°C CPU temperature (via Syslog, at info-level / severity: 4).

The rack it sits in is in an air conditioned room, it has no active components next to it top or bottom and airflow is given.

CPU average is reported as 6 (percent I guess) and memory at around 40.

Is that a normal temperature for those conditions? Or might there be an issue?

What is the maximum / shutdown temperature for the readout?

Manual states "max. 40°C ambient temperature", but since we are now around 25°C at max in that room, I am a bit worried for the coming summer and also the overall longtime stability of the FLEX200.

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  • Zyxel_Jeff
    Zyxel_Jeff Posts: 1,099  Zyxel Employee
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    edited May 2023
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    Hi @StefanZ

    Thanks for your inquiry.
    Currently, the maximum shutdown temperature is 85 °C.
    The 6% CPU usage with 67 °C belongs to a higher temperature.
    We suggest you can check whether there are other devices are nearby your USG Flex200.
    If so, please separate them at a safe distance to avoid the high-temperature issue(as the following user guide described).


    Besides, you can use CLIs to check the current CPU and temperature.
    Router> show cpu average
    Router> show cpu all
    Router> show cpu status
    Router> debug hardware fan-get

    Here is another discussion about the high temperature, it could provide you with some hints.

    Thanks.

  • StefanZ
    StefanZ Posts: 191  Master Member
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    Thanks for the reply.

    The FLEX200 is at the bottom of the rack, 2 Slots above it are empty (4 height units), there is nothing below or to the sides and the air is cooled to 25°C currently.

    Also the table states that the FLEX200 isn't suited for rack mounting, though it comes with rack mount brackets included… Talking about "mixed signals" :-)

    So what temperature range should be expected for my scenario?

    And what can cause the overheating?
    I would put my money on a poorly attached heat sink…

    Current results in command line:

    Router> show cpu status
    CPU utilization: 7 %
    CPU utilization for 1 min: 3 %
    CPU utilization for 5 min: 4 %

    Router> debug hardware fan-get
    Sensor[0]:68 degree
    Sensor[1]:38 degree
    Sensor[2]:43 degree
    FAN[0]:0 RPM
    FAN[1]:0 RPM
    FAN[2]:0 RPM
    FAN[3]:0 RPM

    When I get back to the appliance next time, I will move it to a new, mobile rackmount so I can test it outside the server room at general ambient conditions. But those are likely to be way worse soon than the server room, since summer is coming.

  • PeterUK
    PeterUK Posts: 2,856  Guru Member
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    I guess the Flex200 could of had top ventilation like the USG60

  • StefanZ
    StefanZ Posts: 191  Master Member
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    Would be great, if anyone else using a FLEX200 shared their device temperature to have a comparison.

  • PeterUK
    PeterUK Posts: 2,856  Guru Member
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    edited May 2023
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    I get this but my Flex200 is not in the best place may have to strap on some fans😋

    Router# debug hardware fan-get
    Sensor[0]:72 degree
    Sensor[1]:40 degree
    Sensor[2]:44 degree

  • StefanZ
    StefanZ Posts: 191  Master Member
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    Just tried to find the device temperature of my USG FLEX50.

    Seemingly the CLI cannot show me those (no commands for fan).

    And the cpu-temperature-monitor commands (page 52 of the V5.36 FLEX50 CLI reference PDF) don't seem to exist for this device.

  • PeterUK
    PeterUK Posts: 2,856  Guru Member
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    I don't think lower end models give a temperature read out.

  • StefanZ
    StefanZ Posts: 191  Master Member
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    Thanks!

    Well so mine ain't too special – still rather hot for an appliance CPU.

  • dpipro
    dpipro Posts: 64  ZCNE Certified
    First Anniversary ZCNE Switch Level 1 Certification - 2020 ZCNE Nebula Level 1 Certification - 2020 ZCNE Security Level 1 Certification - 2019
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    Is it possible to obtain the CPU temp through SNMP queries? Thank you

    Best regards
  • Zyxel_Jeff
    Zyxel_Jeff Posts: 1,099  Zyxel Employee
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    Hello @StefanZ

    The USG Flex50 doesn't support the CLI Router# debug hardware fan-get. Thanks.

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