We are using the lightning asic tp-link controllers and a remote power switch to power cycle when the USB bus hangs. Does a PC platform give you much of an advantage performance wise or stability wise? It looks like the tuning options are better, but how is the stability? The tp-link boots up pretty quick, I'd hate to have to keep cold-starting a server/pc to recover the USB bus. I guess we could probably root and install this on our TP links without too much difficulty.
We're going to have to put in a couple of servers to do the pool right. The front end and stratums will be on 2 different VM's on one server in the DMZ, and the database and coindaemons will be on the other on our LAN.
so quick question... you on the modded cpuminer with the power fix that makes these ~8W per unit on scrypt?
Also, I figure you are on Linux so... here ya go...
https://github.com/dtbartle/cgminer-gc3355nice cgminer 3.7.2 with gridseed support and full stats minus temps (guess there is not a sensor?) and has the same power fix so ~8W per unit.
I am not using a USB hub so maybe it is mostly a hub thing... but I have yet to have a single hang up once I was hashing away in cgminer... but again I have a single unit not a whole stack of them.
My understanding from other posts thus far is people are struggling with your hang up issue because the included hub is shit... SHIT. Apparently... it may not be providing enough STABLE power and when one device goes out, the whole hub has to be restarted. I DID experience something like this in my initial testing playing with the miner applications... the USB must be unplugged and plugged back in (or power cycled) in order for the miner to be picked up again... this arose when I was playing with frequencies to get the best rate. The reason you have to power cycle the HUB is that the board itself on each device draws ZERO power from the PSU itself... the damn things will mine on USB power alone so any fluctuation in temp and hashrate can cause a power spike... overdrawing on the hub... causing the hub to fail and require the disconnect and reconnect of the device before hashing will start.
Some have chosen much higher quality hubs with better peak power performance which seems to resolve these issues. So far since I found my best settings... I was dual mining on Win 7 64 bit with my unit... zero hang ups... 7 GH/s SHA256 and 330 KH/s scrypt. I do not have this on my KILL-A-WATT yet but when I get up in the AM and find I have had no stability issues with the cgminer 3.7.2 for scrypt, I will start them again on it to get a power draw in dual mode. Dual requires one cgminer 3.8.5 miner for SHA256 and then a second minerd launched with the --dual flag for scrypt.
FYI I was able to push mine to 1000 clock in cgminer but didn't like how slowly shares came in... 900 settled back to a good rate and has me at 383 KH/s in cgminer. These little work horses have a TON of headroom... the firmware is sadly very flimsy and can't handle the big guns yet... time will tell if we can double their performance.
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