store different tables in different locations

Hi, all

I have several questions to bother you. :)

1 For postgresql, is it POSSIBLE to store different tables in different 
locations where we specify?
For one postgresql management process, is it POSSIBLE to store different 
database in different
locations where we specify?

2 Is it appropriate to use Postgresql to store data for the following 
situation:
  The whole system consists of about 400 machines and I have to develop a 
program collecting the
information about capacity and performance and networt setting and so on of 
each machines and
displaying them for the administrators and some related guys. Moreover, I 
have to store some
history data to display graphes and curvers. My design is as follows: one 
daemon process running on
each machine to collect data and send it to the database which is in one 
specified machine.
The bad thing is that the size of database is asked to be resricted in 900MB 
for some reasons.
The questions are:
 (a) Is it appropriate to use postgresql database in this case? If not, any 
sugguestion will be appreciated.
     In fact considered using common file to store data. but you know, it is 
possible that daemon processes
   on other 399 machines send data simultaneously, ...

 (b) It seems hard to estimate the maximum size of the database, because 
frequently updating and
inserting opreations will cause unused space not acclaiming in time and we 
have to routinely vaccum.
Is there any good and easy, :) way to estimate the maximum size of 
postgresql database accurately?

Best regards,
Duan


--
Duan Ligong
TEL   :  0561-75-1925-6201
           800-81-569-6201
E-Mail : l-duan@zd.cnes.jp.nec.com