> Is there any solution with PostgreSQL matching these needs ... ?
You want: http://www.slony.info/
> Do we have to backport our development to MySQL for this kind of problem ?
> Is there any other solution than a Cluster for our problem ?
Well, Slony does replication which is basically what you want :)
Only master->slave though, so you will need to have all inserts go via
the master server, but selects can come off any server.
Chris