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gravitate (OP)
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August 25, 2013, 01:17:13 PM
 #1
I have a pi running on minepeon with cgminer. I have 2 d link hubs with 6 eruptors in each. The pi has a power supply as do both the hubs. I use the 7th port on one of the hubs to connect the 2. I also have a fan on as close as I can get. However I am getting around 30% errors. Has anyone had the same issue with this or any advice?
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August 25, 2013, 01:18:56 PM
 #2
You connected a hub to a hub? I don't think that is a good idea. Could decrease data transfer and increase problems, but I could be wrong.
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ct1aic
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August 25, 2013, 01:28:07 PM
Last edit: August 25, 2013, 01:38:13 PM by ct1aic
 #3
Please verify the power units that you are using with the HUB's. 6 USB Block erupters need a minimum of 6*510mA=3,06Amperes@5volts or ~15W. And the HUB needs also some current for it to work.

As I can see on D-Link DUB-H7 7 Ports HUB's specifications, "It is recommended that the combined power consumption on all ports should not exceed 2A or 10W.". Link to Amazon

The RPI needs more or less 1 ampere.


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USB Block Erupter: Power consuption: ~510mA --> ~2,5W
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August 25, 2013, 01:31:32 PM
 #4
power supply to the hubs is 3A each and the pi has its own power supply
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August 25, 2013, 01:39:52 PM
 #5
Quote from: gravitate on August 25, 2013, 01:31:32 PM
power supply to the hubs is 3A each and the pi has its own power supply
Try to use only 5 USB Block Erupters in each HUB to see if it is something about the current needed by them.
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August 25, 2013, 02:32:34 PM
 #6
How are you counting errors? Don't compare an absolute value (HW) to a relative one (accepted)
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August 25, 2013, 04:43:34 PM
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I'm counting the errors by the proportion of accepts. I.e. for every 100 accepts I get something like 30 errors and in my pool it shows way under my Mhash/s
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August 25, 2013, 05:53:09 PM
 #8
Daisy chaining hubs isn't an issue.

As others have said, you're probably going over on power.  I run those DLink hubs with 5x BE's in each, and a USB fan on one of the hubs to cool all of them...  My HWerror rate is under 1%.

I had stability issues running MinePeon, so I switched to PIckaxe... but I believe stability is much improved in MinePeon 0.2.3a or so.. ?
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August 26, 2013, 05:07:08 AM
 #9
I put an 2 extra hubs in to take 2 eruptors and 1 to relay them to the pi. the errors have gone down to 20% now. Still not what I had hoped but better I suppose Sad
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