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Author Topic: Multiple Antminer U2 Powered USB Hub Lower Than Expected Speed  (Read 1194 times)
headswim
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June 15, 2014, 05:16:43 PM
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Hello all,

I am attempting to run several Antminer U2s in tandem through a powered USB hub with a raspberry pi. I am using MinePeon 0.2.4.6 and bfgminer 3.10.

I am using a powered USB hub with a 12V 5A power supply found here: https://buyahash.com/shop/10-port-usb-2-0-hub/

When I plug one miner into the hub and run everything, it works fine. Adding a second miner tends to drop the speed of both, a third does the same even more, until by the time I have added a fourth I am down to ~1ghash on 1 miner and ~.3-.5ghash on each of the other 3. I'd like to eventually get up to 8-10 on the hub, which I believe should be doable given then amount of power it should provide.

I'm pretty sure the issue is power draw for each of the miners. I purchased a second usb powered hub of identical make (in case it was that specific unit), which did not resolve the issue. I have tried 2 other powered hubs with similar results, and have a fourth on the way. I don't believe it's a hardware issue at this point, since the one I'm using from buyahash seems to be of a high quality. I know there are other recommended options but I'd like to not have to spend $40-60 for a powered USB hub in the future.

Is there a way to increase the power draw through the config file? In my MinePeon dashboard under settings -> Miner startup settings it says:

#!/bin/bash
sleep 10
/usr/bin/screen -dmS miner /opt/minepeon/bin/bfgminer -S all -c /opt/minepeon/etc/miner.conf

Would I need to modify this text, or go in through the pi and modify the config file? Also, what would be the right text to add to help resolve this?

Thanks in advance!
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