I am in the process of setting up a SLES 10 SP1 server for ZLM installation. I am thinking of setting up partitions /, swap, /opt, /var and /etc

Am i on the right path? How much space is required for an organization with around 2500 users, workstations etc?

Is it advisable to set up /opt, /etc, /var on a SAN disk while /, swap remaining on local system disk?