1) Can I have direct access to the drives for writing?
Yes, no problem at all, no confusion.
2) Are the files I've written directly to one of the individual drives immediately shown in the mhddfs pool?
Yes, immediately. Mhddfs never caches any metadata. Bad for performance, but good for directly accessing the member drives.
3) Or do I have to rebuild the mhddfs pool each time I write data by my own?
No.
4) How can I use aufs and does it make sense to integrate aufs?
For what you are doing, aufs (aufs2 ?) may be a better choice. It provides the functionality you need: read access to everything under a single mount point, write access to individual members. The reason to perhaps prefer mhddfs over aufs, is if you want the filesystem to automatically figure out where to store stuff. Otherwise, aufs will have higher performance (being an in-kernel filesystem).
Cheers
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