I guess You're right.
Although I really believe in Linux and cool solutions which it provides, but our goal now is to use and test what we already have,that is that fake raid, compare it with Linux software and make a final decision at the end. Do You know how to make use of it ?
Another option is to add a true hardware Raid controller like this: http://content.it4profit.com/itshop/...is-new&LANG=pl
and maybe everything would go smooth this time.