EXPIRED HP Q2F24A SN2100M 100GbE 8 QSFP28 Half Width Switch GBP 750 OBO

Rand__

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Mar 6, 2014
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These seem to be new, from what I've seen by the serial# they are still under HP warranty.
16 Port half width switch, 8 licensed
Seller took 700+shipping, tried everything from 450 up :p, but maybe lower for more then one - seems to have 6 total left from what he said.

Have not received mine yet, will take a few days but will o/c provide feedback
 
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Psycho_Robotico

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Nov 23, 2014
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Interesting find! Do you have any data regarding power consumption? "Typical Low Power 95W" is a bit higher than I'd like and other Mellanox gear is quite efficient under partial loads. How about Module compatibility / vendor lock?
 

Rand__

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I've been told by @boliniak1 that power consumption is not as good as I'd hope, but I will see how it compares to the other swithces (6036/2700) when its here
No idea re compatibility
 
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ArthurA

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I haven't seen many anecdotes about 100G switch power consumption from the homelab scene but I can't imagine they're on par with lower tier ethernet, the ASICs have to be fairly hungry on their own and each XCVR pushing 4 lasers add up fast. Comparing to CFP class 100G power consumption should be favourable but I don't know that many of you see those as often as those of us in fibre transport.
 

kedzior

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Power consumption strictly depends on the number hots/cables and of course, passive or active cable, half populated SN2100 takes around 90-150W (depends also on port activities). This is not power-hungry switches.
 

Psycho_Robotico

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Power consumption strictly depends on the number hots/cables and of course, passive or active cable, half populated SN2100 takes around 90-150W (depends also on port activities). This is not power-hungry switches.
Do you derive those numbers from own measurements or are they based on the spec sheet?
 

Psycho_Robotico

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May i ask what kind of connections you use? I.e. QSFP28/DAC and port speeds. Just wondering how much it might draw with only two 100G DAC links plus a few 10/40G ports.
 

Psycho_Robotico

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It was a mixed connection few Active and few Passive, I checked on two active connections 100GB and it is around 92W.
Thank you! That's a bit high for my taste (second highest electricity prices in the EU :eek:). My SX6012 is insanely low power when running just a few 10G and 40G links at around 50W. I'd have hoped for some efficiency gains on this newer generation of devices.
 

Rand__

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Dont get your hopes up, sx6012 is really insanely low for its performance, 6036 is okish (~60W for me atm, fans are up a lot these days).
I hope to stay below then SN2700 with this one (maybe up to 75/80) but its not gonna be close to the 6012.
 

Psycho_Robotico

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Sure, but it's not like it would be under full load 24/7 in a homelab environment. At least not in mine;) Thus I hope for acceptable numbers in idle:)
 

Rand__

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Initial boot, some ideling and first fw update, lowest idle at slightly above 40W - surprisingly good.

1599995674754.jpeg

Note its currently hard locked to 8 interfaces, not sure if a 16 interface enabled one will draw more power or if these get turned off due to green ethernet (which might or not be available on this switch/os, have not checked).
 

Rand__

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None yet, just fired it up and now its sitting behind me waiting for attention;)
Values above were with management port attached only.
 

Psycho_Robotico

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Did you hook up one or both PSUs? Let's see how much it consumes once there is traffic on a few ports. To match kedzior's numbers it would have to double power compared to idle.
 

Rand__

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One psu only.
At this time I have no urgent need to use it to be honest (moved everything to 56G for power saving a few weeks back), so probably will reserve it for attempts to extend to 16 ports first, sorry.

I think/hope @kedzior's numbers came from his active qsfp28 modules -

This example takes 2.5-3.5W per module, so 5-7W per cable.
 
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