Many clients wish to know what the hardware and operating system requirements are for Delft-FEWS. On this page you can find a list of specifications. If you have any question about the list, or you do not see the operating system of your choice: please contact us. This list is not exhaustive.

Operator clients
The operator client (Gui) is the user end - thick client.

Forecasting Shell Server
The forecasting shell server is the server for execution of forecast runs. It contains the modelling software and it's operation is controlled by the Master Controller

Master Controller Server
The master controller organises task traffic and scheduling

Central Database
This is the central data repository, linked to the master controller. The live system is known to run with the following database versions:

This list is not exhaustive, so contact us if you are thinking of using a different database or a different type.

The webserver is an optional server that hosts and distributes the webpages generated by Delft-FEWS. Hardware requirements depend on the intended use.

It is possible to deploy the master-controller components / forecasting shells in virtualized environments. It is recommended to contact the Delft-FEWS product management beforehand so that they may advise on virtualization options.

Requirements overview


ComponentDescriptionHardware requirementsOperating system/ Software requirementsInstances
Operator Client (Gui)

The Delft-FEWS client used by end-users.

client side, normal pc

Windows 7 / 8 / 10, Server 2008 / 2012(R2)

Linux RedHat Enterprise, CentOS (6.x 64 bit, 7.x 64 bit) / SLES (11.x, 12.x)

As many as there are clients



Control and distribute configuration via the Master Controller database.

client side, normal pc

Windows 7 / 8 / 10, Server 2008 / 2012(R2)

Linux RedHat Enterprise, CentOS (6.x 64 bit, 7.x 64 bit) / SLES (11.x, 12.x)

As many as there are application managers
Forecasting Shell Server

Executes forecast models and stores the results in the central database.

Minimum 2 GB RAM and 1 one CPU core per Forecasting Shell Server instance. CPU typically Intel Xeon E5606 2.33 GHz or equivalent. Always reserve 1 CPU core for the OS.

Windows 7 / 8 / 10, Server 2008 / 2012(R2)

Linux RedHat Enterprise, CentOS (6.x 64 bit, 7.x 64 bit) / SLES (11.x, 12.x)

Contains modelling software (incl. licenses), OS usually dependent on 3rd party modules and modelling software

Recommended minimum 2, more depends on computational load
Master Controller Server

Dispatches tasks to the Forecasting Shell Servers.

Maintenance of central database.

Synchronisation between master-controllers.

Sends system alerts.


Minimum 1 GB RAM per MC instance. CPU typically Intel Xeon 2.33 GHz or equivalent.

Windows 7 / 8 / 10, Server 2008 / 2012(R2)

Linux RedHat Enterprise, CentOS (6.x 64 bit, 7.x 64 bit) / SLES (11.x, 12.x)

Other Unix-like operating systems possible (e.g. HP-UX, Solaris), as long as there is a JDK of the correct version available for the OS. JBoss 4 / 5 or ActiveMQ are required for the JMS layer.

1 or 2
Central DatabaseCentral data repository

See Database vendor requirements + 8 GB RAM per DB server including 1 MC DB instance and. CPU typically Intel Xeon E5606 2.33 GHz or equivalent. Add 1 GB RAM per extra MC DB instance.

Oracle 9 / 10 / 11 / 12

PostgreSQL 8.4 / 9.2 / 9.3 / 9.4

MS SQLServer 2008 / 2008R2 / 2012 / 2014

The database instance(s) can be a hosted on an existing database server or cluster.
One instance per Master controller
Admin Interface

Super-user monitoring, system control and task scheduling

Minimum 1 GB RAMApache Tomcat 6 / 7One instance per Master-Controller machine
Archive Server

Stores forecast data, performance indicator data and configurations on a longer time scale than in the central FEWS system.

Ample storage space for Archive files

Apache Tomcat 6 / 7

Separate database instance with same requirements as Central Database for Master Controller.

"NFFS/FEWS" Web Server (optional)For disseminating forecast data and data from other sourcesTypically 1 GB RAM per server instance and CPU Intel Xeon 2.33 GHz or equivalent.Weblogic 11g with an Oracle Database. JBoss as Application Server and Databases PostgreSQL 8.4 and MS SQL Server 2000/2005 supported1 or 2

Scalability, number of servers

The components mentioned above can all be located on one (powerful) server or each on an individual machine, with all possible configurations in between. When using multiple machines it is essential that all machines have matching clocks. This can be achieved by making use of one and the same ntp server. A typical configuration is:

Typically in a dual master-controller setup every master-controller has its own machine so that maintenance can take place without offline time.

Java JRE versions

Note that java should never be installed in a browser. Delft-FEWS only uses the java JRE in embedded form.

VersionRequired JRE

Operator Client /

Forecasting Shell Server /


Master-controller /

JBoss / ActiveMQ / Tomcat

Delft-FEWS 2015.01 and newerJava JRE 8 update 4532bit32bit or 64bit
Delft-FEWS 2013.01 until 2015.01Java JRE 7 update 7132bit32bit or 64bit
Delft-FEWS versions before 2013.01Java JRE 6 update 4532bit32bit or 64bit