NVRAID5 (and I assume Intel raid5) need the dmraid45 module. Reproducible: Always Steps to Reproduce: 1. Have a "fake" mobo raid 5 created from BIOS or Windows. 2. Boot into livecd and attempt to activate 3. dmraid -ay Actual Results: device-mapper target type "raid45" not in kernel Expected Results: Target should be activated correctly if module is present. There's a kernel patch for this located here: http://people.redhat.com/~heinzm/sw/dm/dm-raid45/
*** This bug has been marked as a duplicate of bug 195804 ***