fake raid vs software raid

[Brock Lessels]

i am currently running dmraid on gentoo linux. the system uses a sata
sil3114 card with 4 drives running raid01 the only issue is that the
install takes alot of fiddling and i have 6 more machines to get up
and running.

firstly could anyone tell me if there is any performance issues using
software raid rather than the cards raid format?

secondly does anaconda support dmraid yet on fc4?