High Availability of the Services and High Load on Web Servers

In this scenario, you can maintain a Web Farm with Web Servers and a AVEVA Work Tasks Services cluster on separate machines while the Databases are installed on a different machine. This deployment provides scalability and high availability of the Workflow Engine and Web Servers. This is achieved by distributing the load equally among all the machines in the cluster and the Web Farm.

Multiple servers in the Web Farm or the cluster run the same services. Failure of a server does not impact other servers. You can take the affected server offline while the other servers maintain the service. This type of installation provides Failover. Thus allowing you to easily add or remove machines from the Web Farm or from the cluster without affecting the execution of workflows.

This is the optimal scenario for heavy load conditions and can be considered if you anticipate heavy load on the Workflow Engine or the Web Server.

See: Web Farm Connecting to Separate Services Cluster with Database on a Different Machine