> Hmmm. Seems to me that this setup would be better than one RAID5 with three
> 36Gb disks, wouldn't you think so? With one RAID5 array, I would still have
> the data and the WAL on one volume...

Definitely.   As I've said, my experience with RAID5 is that with less than 5 
disks, it performs around 40% of a single scsi disk for large read-write 
operation on Postgres.   

If you have only 3 disks, I'd advocate one disk for WAL and one RAID 1 array 
for the database.

Josh Berkus
Aglio Database Solutions
San Francisco

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