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

Virtualization

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. The Deltares ICT team has most experience with Delft-FEWS on VMWare VSphere with in-depth knowledge but Delft-FEWS is also known to run on Microsoft Hyper-V. Virtualization of the Delft-FEWS back-end services can generally be done without problems. Best practice is to build small appliances so that the Master Controller, MQ Server ( Jboss / ActiveMQ) and Tomcat Servlet Engine ( Admin Interface) all have their separate virtual machines. Virtualization of the Forecasting Shells is currently not recommended for heavy computational models. For every Forecasting shell there should be a separate virtual forecasting shell server. The number of virtual processor cores issued should never exceed the number of physical cores for forecasting shells.

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