I haven't used a R-pi - but my home setup has 2 "normal" powered hubs (2.0 Amp) with 4 block eruptors on each. Hum-ing away fro over 36 hours now. No problem.
Cool, thanks for sharing.
In case anyone else is interested, the hubs I'm using where I can get 5 or 6 usb block eruptors running with raspberry pi are these ones (d-link 7 port DUB-H7):
http://amzn.com/B00008VFAFIt'll do 6 without a fan, or 5 with a fan. Specifically, I'm using this fan:
http://amzn.com/B003XN24GYI'm running 12 on a Pi with 2 D-Link 7port powered hub I use the 7th port for a fan, seeing 4Gh/s with no issues.
I have tried adding 13th... It appeared in the cgminer list, but was erroring. Not sure if its power or the PI's USB bandwidth. Anyone know how much bandwidth each of these erupters takes?