Thanks,  David.

Maybe f17 installer is easier for me. I never install dualboot Linux on one hard disk. I always test such things on my slc usb3.0.

Back to the title. As I used yesterday, f18 anaconda partitioning interface just made me more confused.

I'll try f17 anaconda to see if things can go along.

And,  fedoraforum suggest me using ext4 instead of lvm.