file system and raid performance

Hi all,

We've thrown together some results from simple i/o tests on Linux
comparing various file systems, hardware and software raid with a
little bit of volume management:

http://wiki.postgresql.org/wiki/HP_ProLiant_DL380_G5_Tuning_Guide

What I'd like to ask of the folks on the list is how relevant is this
information in helping make decisions such as "What file system should
I use?" "What performance can I expect from this RAID configuration?"
I know these kind of tests won't help answer questions like "Which
file system is most reliable?" but we would like to be as helpful as
we can.

Any suggestions/comments/criticisms for what would be more relevant or
interesting also appreciated. We've started with Linux but we'd also
like to hit some other OS's. I'm assuming FreeBSD would be the other
popular choice for the DL-380 that we're using.

I hope this is helpful.

Regards,
Mark