Gabriele,
> By any chance, do you have some reference or some tests that talk about the
> fact that RAID5 with less than 5 disks is not performing?
Just this list. But it's easy to test yourself; run bonnie++ and compare the
performance of seeks and random writes (which PG does a lot of) vs. a plain
single disk.
--
--Josh
Josh Berkus
Aglio Database Solutions
San Francisco