RAID-0 has been causing problems for me over the last few days. Finally I opened up the bloody box and re-connected the two 200 GiB hdds to the main SATA controller. Took some time to actually push all the data onto a borrowed 250 Gib usb hdd - before I broke up the RAID-0 setup. After all that, now the system is back to normal.
/dev/sdb1 47G 42G 4.9G 90% /dev/sdb2 47G 15G 33G 31% /dev/sdb3 92G 48G 40G 55% /dev/sdc1 48G 34G 15G 71% /dev/sdc2 48G 48G 159M 100% /dev/sdc3 90G 42G 44G 49%
Looks like I can finally throw out Fedora Core 3 out of the box.