Hardware
Recommendation for 300 concurrent users:
- 8 GB RAM
- 2 CPUs > 2 GHz
- 200 GB HDD
Software
We recommend Linux (64bit).
The following distributions are currently used for productive instances:
- Scientific Linux
- Red Hat Enterprise Linux
- Ubuntu
- Open Suse
- SUSE Linux Enterprise Server
Other distributions are possible.
Software components
- Web server: Apache web server + mod_ssl (mod_jk or proxy_ajp)
- Database server: Postgresql
- Application server: Java 17, Apache Tomcat 9
Distribution
- Up to 300 concurrent users: All components on one server
- Up to 500 concurrent users: Separation between database server and application server
- Up to 800 concurrent users: Separation between database server, application server, and web server
- Up to 1200 concurrent users: Multiple OPAL nodes on the application server
- More than approx. 1500 concurrent users: Multiple application servers