Btree indexes temp copy Was [Re: Cluster using tablespaces?]

[Ow Mun Heng <Ow(dot)Mun(dot)Heng(at)wdc(dot)com>]

On Wed, 2007-11-28 at 18:30 -0500, Tom Lane wrote:

> For btree indexes, there is a temporary copy of the index data, which
> will go wherever you have arranged for temp files to go.  (I think that
> easy user control of this may be new for 8.3, though.)

In 8.2.5 is there a way to control this? I noticed that when I create a
new index etc, it will hit the os disk (that's where the main tablespace
is located but no data is actually being stored there except for PG's
template1/0 etc table)

I would rather it hit the Raid Array. I looked at the postgres.conf file
but didn't see anything obvious to point out the temp location..