Same old problem...been trying for a couple hours to install T2 onto a SATA Intel ICH5 software RAID 1 drive, and anaconda would just fail with a exception and force a reboot. I rebooted with "linux noprobe" and added the network device and got past the exception to the disk partition section, but when doing it again and this time adding the RAID device, it fails again with the same exception.
So, I believe, the device that is either probed or selected for software RAID in FC5T2 will fail and not allow installation, so my sda and sdb drives cannot be used. I may move my Mandriva Cooker to the RAID, and try again on hdb. By the way, just for grins, last week I installed Suse 10 onto the RAID and it was seemless, perfect, no drama. I wish we could get FC5 into the same place.