Re: [ADMIN] H/W RAID 5 on slower disks versus no raid on

Mario Weilguni <mweilguni@sime.com> writes:
> If 4 drives are an option, I suggest 2 x RAID1, one for data, and one for WAL and temporary DB space (pg_temp).

Ideally there should be *nothing* on the WAL drive except WAL; you don't
ever want that disk head seeking away from the WAL.  Put the temp files
on the data disk.

            regards, tom lane