Tablespaces

Dear all,

I'm having some problems with setting default tablespaces for people.
I have some directory's on our server as follows (names changes):

/home/userdb/persona
/home/userdb/personb

And each person has their own login for PostgreSQL. However when they
create tables and databases etc, they aren't being created in these
folders as I would like (to do with storage issues).

If I go to here:

 /var/lib/pgsql/9.0/data/pg_tblspc/

Then I have two files.

lrwxrwxrwx 1 postgres postgres 21 Jul  9  2012 17282 -> /home/userdb/persona
lrwxrwxrwx 1 postgres postgres 22 Jul  9  2012 17285 -> /home/userdb/personb

If I go back into psql, and run this:

SELECT relname FROM pg_tablespace;

I get this:

personatabs     |    17828     |  /home/userdb/persona
personbtabs     |    17285     |  /home/userdb/personb

So it looks to me like any databases or tables made by each user
should go into their default folder on the server no?

I have even got persona to login and run the following command:

SET default_tablespace = 'personatabs'

But when they run a command such as this, the new database is still
made in the default directory, rather than the persona folder:

CREATE DATABASE testing(i int)

Would appreciate any thoughts and guidance please. The aim is to keep
everyone's work in their own folders.

Thanks

James