RAID: Further to a prior posting, I decided to backup and reinstall; mounting the system root on a SCSI RAID 0. The Fedora crew did a great job with the RAID installation interface. It is extremely intuitive. Basically, if I can do it, anyone can. NFS4: REALLY worth the effort. I am enjoying a 60% (measured) increase in throughput over NFS3. Reiser4: You need a Korg kernel (with 8k stacks) at this point. I have a 16gb database on a workstation R4 partition (IDE). It SEEMS faster than Ext3 but I have no pragmatic measurements.
