AMD Athlon 550 256MB RAM Stable for a very long time (in fact since before athlon hit the public) AMI Megaraid + 4xIBM 9Gb drives RAID5 array with writeback and 128K stripes (hardware raid) After a couple of unscheduled hard boots the ext3 file system was corrupted beyond repair.
AMI megaraid firmware bug (kernel bug was closed ages ago)