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I can confirm that with proper cooling, the HW error rate of the Block Eruptor drops to a fraction of the rate without cooling. The Arctic Breeze USB fan is ideal for this, although you may have trouble fitting it into your USB hub. I used a separate USB power supply.
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The USB fan is here, but I couldn't fit it into the USB hub along with the Eruptors. Instead, I used a second USB power supply, and it's working great. Very quiet. However, my hashrate fell again. You can see two dips in the weekly graph:  Hopefully the fan will stop this. |
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Big problem this morning: cgminer reported all 5 Block Eruptors hashing at 250MH/s, amd all five BEs had their green LED illuminated. This could be a heat issue; I'm not sure. I've unplugged everything for now to let it cool.
Ups, lets hope it's mothing big. The rig is running normally now, but I'm worried this instability issue might happen again. I don't want any downtime. NEED USB FAN!! |
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Just for fun and giggles, do you have a kill-a-watt running for all those badboys? and if not, get one  Yep, I've ordered one!  I can tell you now that the rig will draw a max of 20 Watts. 5V x 3A = 15W for the USB hub, plus 5V x 1A = 5W for the USB power supply for the RPi. |
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Big problem this morning: cgminer reported all 5 Block Eruptors hashing at 250MH/s, amd all five BEs had their green LED illuminated. This could be a heat issue; I'm not sure. I've unplugged everything for now to let it cool.
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$ screen -r
There is no screen to be resumed.  --> sudo screen -r nope, to resume screen, you need to have one running. The super user has one running. Or something. sudo screen -r works. |
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I take it error rate % is determined by HW/A * 100 (cgminer)? Also mine is holding at 330MHs. Anyone getting better? No fans, plugged into my desktop.
Mine are holding at 335.5MHash/s. Error rate about 4.5/m but this is without any cooling. |
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Is there any original source to get How to get block erupter usbs? Thanks
ASICminer sells them in batches of a minimum of 300 units. Actually it's 50 units now. |
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Current profitability is 60 mBTC per day. I was hoping for 70, It is already a failure... If you were smart you would have re-sold the BE's on Ebay, because they are not likely to mine with profit.... The rig is operating at 85% of what I estimated. With proper cooling this will increase, further improving the accuracy of my prediction. Profitability is something that is above and beyond your current expenses for a given endeavor.
If I spend $1000USD on setting up a business then find $10USD it is not profitability...
It is an offset against costs. You are technically correct on this one point of business. I will rephrase my statement: revenue is 60 mBTC per day Your costings are WAY off and do not give a true depiction of the situation.
(electrical/cooling costs) The Raspberry Pi model B draws 700mA @ 5V. This is 3.5W of power. The 5 USB Eruptors each draw 500mA @ 5V. This is 12.5W of power. The USB fan will draw another 2.5W. This is 18.5W in total. This is slightly more than a modern light globe. My costings are accurate. This is why so many businesses fail in the first year.... Second point... Neither works. The eBay one only outputs 500mA @ 5V The hub is working 100% correctly, the USB standard CLEARLY defines that 500MA is the maximum current a device can draw. The fact that this USB miner draws more, is a testament to the poor design in using the USB port beyond its spec. The cheapo ebay hub can draw 500mA for all seven USB ports. This is enough current to power one Block Eruptor, which does conform to the USB standard. The D-Link hub I am using can deliver 3A, enough to power six Block Eruptors. |
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Great documentation & thread idea!
btw - the 2 hi-power ports on the D-Link work as normal data ports as well, no?
Yes, absolutely -- just note the power supply delivers a max of 3A which is enough to power 6 Eruptors. You can use the 7th port to daisy-chain another hub! |
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So I've been hashing for 24 hours, and everything is running smoothly. The hashrates have reduced slightly overnight. Yesterday they were in the 335.5-336.0 range, and now they're in the 335.0-335.5 range. The tiny divot on the daily graph at midnight is my donation time to Neil. Hardware errors are still high, so I really need the USB fan to arrive soon. Current profitability is 60 mBTC per day. I was hoping for 70, but maybe this will improve when the cooling is installed.  |
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Best proven to work Hub is the DLINK D7, but its only 7 ports. I would recommend 5 USB erupters plus a fan per hub.
I can confirm the D-Link DUB-H7 works with at least 5 Eruptors. Just daisy-chain 2 of them. |
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cgminer 3.2.1 stats  EDIT: Better cgminer 3.2.1 stats (24 hours later)  |
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 IT'S UP AND RUNNING!!EDIT: Better photo  |
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Just thought I'd ask here before creating a new account on the eclipsemc forums: where are their official server settings? I can't seem to find them anywhere. . . EDIT: D'oh, shoulda searched more: https://bitcointalk.org/index.php?topic=16385.0 |
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I'm just glad we paid the extra BTC to make sure everything was insured!
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I've just setup MinePeon-2013-06-11 and it's up and running, but how do I get the output of cgminer in my SSH client? Still learning Linux. . .
Thanks. The instructions on the MinePeon wiki are missing the sudo |
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I've just setup MinePeon-2013-06-11 and it's up and running, but how do I get the output of cgminer in my SSH client? Still learning Linux. . .
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