sorry i don't understand your question...
RAID levels have nothing to do with the filessystem, the raid is the device where you can install a filesystem but not in the otherway....
RAIDs [A case for Redundant Arrays of Inexpensive Disks] are standards defined by the Berekley University. defined are RAID 0-5 and compinations like 1+0 or 0+1. use your google to search for the principles behind the diff levels.
gP