I had zero freeze/zombie issues and a "set it and forget it" mentality with this config:
RasPi 2 (with freeze watchdog enabled)
MinerA (with auto reboot set when miner stops hashing)
One U3 would be solid hashing then die randomly; and within 5 min it resets itself and bam. back hashing.
I didn't rely on the solid red LED up front because sometimes when it went zombie or simply went to a zero hashrate; the red LED was still lit solid....
RasPi 2 (with freeze watchdog enabled)
MinerA (with auto reboot set when miner stops hashing)
One U3 would be solid hashing then die randomly; and within 5 min it resets itself and bam. back hashing.
I didn't rely on the solid red LED up front because sometimes when it went zombie or simply went to a zero hashrate; the red LED was still lit solid....
This watchdog ?: http://blog.ricardoarturocabral.com/2013/01/auto-reboot-hung-raspberry-pi-using-on.html
What setting in minera do you use ? Because I tried several, without success...
If i tell the miner to restart after 600sec (10mn), it restarts after 1mn anyway...
i cant quote on the watchdog, but its well documented; I followed an online tutorial.
Thats the correct setting for minera; just set a sane timer for reboot (2-15 min?)...
I always saw a solid hashrate bar in the readouts; and can normally see blips in the hashrate graph if it reset....
With MinerA I believe I used bfgminer; gridseeds the regular cgminer.