Aruba MAS series SFP+ & POE+ switches sub-$100

Discussion in 'Great Deals' started by cheezehead, Jan 3, 2019.

  1. ViciousXUSMC

    ViciousXUSMC Active Member

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    Pretty sure that entire thing was summed up in my first sentence:
    I do not have a background like that, but I do have a background in building computers, speakers, etc and I know from experience what has worked for me and what has not.

    I mean if your turning this switch into a steam turbine, by all means give it a go.
    And above all else, like I said to the last person. Try it and report back.
     
    #101
  2. Dawg10

    Dawg10 Associate

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    I learned early on that P.Eng's are smarter than me. If a product is designed to work in one manner, any other manner is to be avoided unless re-certified by another P.Eng. Reversing or otherwise modifying switch airflow means you're running the product in a manner not tested nor approved/ certified by the manufacturer nor any associated licensing body. Yes, modifying switch fans is as minor an issue as you can get, but the underlying comment is the same: you don't know what unintended/ negative impact you're making on the product.

    In a switch with low internal resistance to air flow, 2 fans in and 2 fans out is very nearly the equivalent of just 2 fans in, which is likely why it doesn't work for you.
     
    #102
  3. myrison

    myrison New Member

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    I'm definitely not smart enough to comment on the previous discussion, but did want to update everyone that I ordered a couple of the fans below to see how they far in the switches. I think that my switch came with a couple of the fans that may have been bad/aging (i.e. bad bearings or something similar that caused more of a 'whine' than they should have while running).

    Evercool 40x40x20 4-pin fan

    I'll let everyone know once I have a chance to give them a run.
     
    #103
  4. ViciousXUSMC

    ViciousXUSMC Active Member

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    The stock fans are two different type in my switch.
    I lost the pictures I took of both but the one I found is the Delta Electronics FFB0412SHN
    13000RPM
    24CFM
    54.5DBA

    This gives you a good place to start on replacement fans.

    For reference the Noctua NF A4x20 FLX I used are.
    5000RPM
    5.53CFM
    14.9DBA

    I think good replacements would be things like:
    Sunon 40mm (40x40x20mm) 12V DC Fan Model KDE1204PKV3.MS.AR.GN RPM Sensor
    5200RPM
    6.8CFM
    18DBA

    So a bit louder, a bit stronger, and about half the price of the Noctua fans.

    The other thing is the stock fans are 28mm depth and there is a delicate balance between speed, noise, and size.
    The smaller the fan the less CFM and more speed/noise it needs to compensate. The easy to find fans were 10mm and 20mm so giving up 8mm of depth for the Noctua meant just by default I lost some potential power.

    On the coolerguys site they do have 28mm fans, so those would be the ideal replacements.
    Something like this: Evercool 40x40x28mm 12V PWM Fan with Connector-EC4028HH12BP

    Should pretty much end up being a direct replacement in size/capabilities but a bit slower and a bit quieter.
     
    #104
  5. myrison

    myrison New Member

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    Thanks Vicious. FYI the ones I ordered are the smaller 20mm depth ones.

    Info about these varies a bit on different sites... but this is what I believe they offer:

    40x40x20, model EC4020SH12BP:
    4-pin
    Noise: 14.7- 32 dBA
    Speed: 3000 +/- 25% ~ 9000 +/- 10%RPM
    Airflow 9 CFM max

    The 40x40x28mm one Vicious posted (model EC4028HH12BP):
    4-pin
    Noise: 16.1- 46 dBA
    Speed: 3000 +/- 25% ~ 12000 +/- 10%RPM
    Airflow 19 CFM max

    For those that aren't familiar, the decibel approximately doubles in perceived loudness every 10dB, so the 28mm fan is approximately 2x as loud and 2x as powerful as the 20mm version.

    For the 20mm fans I chose, compared to the Noctuas, they are capable of being as quiet as the Noctuas at their lowest RPMs but will be about 3x as loud. (and 30 dB online is described as nearby whispering... if that's what they produce I can live with that) :)

    Ultimately the proof will be in the listening once they're here, but on paper at least they seem to fall nicely in the middle (which was pure luck for me as I didn't realize there was a 28mm version of the fan until Vicious posted it).
     
    #105
  6. ViciousXUSMC

    ViciousXUSMC Active Member

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    One more for you guys. Covers creating new user accounts, vlans, jumbo frames, switching-profiles, etc.



    If I do any more it will be advanced with access control lists or something as I think this covers most of the basics.
    However if you have ideas, let me know!
     
    #106
    klui, Dk3, james23 and 2 others like this.
  7. klui

    klui New Member

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    That was a good video--thanks. The overall concept of assigning a profile to a interfaces is not too difficult.

    One thing I've never done is ACLs and if you use them at work (I don't deal with networking, only from a periphery level) I would be interested getting your take about ACLs on a single subnet. For instance, different organizations using a single /22. I saw a document from Cisco that describes in certain cases you need two (or maybe more, I gather) ACLs due to how the mask is set up and that's the thing that was difficult to grasp.
     
    #107
  8. cheezehead

    cheezehead Active Member

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    So in a larger subnet say no one needs access to the security cameras but now one machine does...ACL's can be used to allow the one machine through to security camera subnet. At home this is pretty limited, but for work they really extend this functionality through security roles/policies via clearpass so that when user-x logs into anywhere they would receive the same security profile. If another person logs into the same workstation a minute later, they would get a different security profile.
     
    #108
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