Storage buses don't need any configuring -- i'm not sure they even have a config panel. They simply attach whatever they are pointing at to your network. When you drop Logs (or whatever items) into your network, the AE system looks at Preformatted disks first (which you can also set priority on), then it looks for any currently stored Logs in the network and just adds the new Logs to those already in the network wherever they are (including non-AE storage attached via Storage Bus).
They don't need to be configured, but they can be. Just right click the storage bus itself.
I tried using one to split my combs... so the first few stacks would go to a hopper feeding the centrifuge... which then pumps the results back into the system. My hope was that every time I put a new load of combs in, that some would go to processing and the rest stored for later. It worked for a bit... then I had to sort out my storage drives and it broke the setup. Now priority is given to the location combs are already stored in my system and the storage bus never gets anything for the centrifuge.
I'll be attempting to fix it once I have enough power to keep my storage system running for more then a few minutes at a time. I think if I break the bus and set it up again, it will give priority back to the bus... since until I manually sorted the drives, it worked fine... I just had dripping combs on 7 different drives, fir sappling across 4 drives and a few other issues. I didn't format any of the drives yet, but I think the manual organizing changed the priority order... newest additions to the system seem to get priority over storage buses that are configured.
I am wondering though, if I format a drive to take a particular item (say, potatoes)... can I personally put something else in that drive (say, carrots)... and can a machine put stuff in that drive (say, planks from a sawmill)?
Yes, I'm using an ME chest beside a sawmill. The system keeps putting random junk it it, despite the 2 other drives in the ME drive that are near empty.
I realizes that I may have been using 'drive' in place of 'storage cell' or something... to me, it is a bunch of hard drives getting mounted in a drive rack or interface chest.