Carlos Moreno <moreno_pg@mochima.com> writes:
> The question is: does PostgreSQL have separate, independent areas that
> require storage such that performance would be noticeably boosted if
> the multiple storage operations could be done simultaneously?
The standard advice in this area is to put pg_xlog on a separate
spindle; although that probably is only important for update-intensive
applications. You did not tell us anything about your application...
regards, tom lane